Transmitting system and receiving system for multi-carrier broadband simultaneous information and energy transfer

Abstract

A transmitting system and a receiving system for multi-carrier broadband simultaneous information and energy transfer are provided, the transmitting system comprising: a signal management control system, a baseband signal generating unit, an encoding unit, a serial-parallel conversion unit, a mapping unit, a modulation unit and a parallel-serial conversion unit. By adopting the transmitting system for simultaneous information and energy transfer, separate energy signals are transmitted simultaneously while the information signals are transmitted to the receiving end, and sufficient energy can be provided for the receiver. Besides, by optimizing information signal and energy signal through the optimization algorithm, not only the energy transfer efficiency but also the information transfer rate can be improved.

Claims

1. A transmitting system for multi-carrier broadband simultaneous information and energy transfer, comprising: a signal management control system, configured to match with an optimization algorithm, perform pre-allocation of carrier, power and frequency spectrum on information signal data stream and energy signal data stream in a baseband signal dynamically based on channel quality parameters, so as to generate a pre-allocation parameter set; a baseband signal generating unit, configured to generate information baseband signal and energy baseband signal corresponding to the pre-allocation parameter set; an encoding unit, configured to encode the information baseband signal and the energy baseband signal respectively so as to generate corresponding encoded information baseband signal and encoded energy baseband signal; a serial-parallel conversion unit, configured to perform serial-parallel conversion on the encoded information baseband signal and the encoded energy baseband signal to generate parallel data streams; a mapping unit, configured to classify the parallel data streams and perform corresponding modulation and pre-allocation on the information baseband signal and energy baseband signal in the parallel data streams according to the pre-allocation parameter set; a modulation unit, configured to modulate the information baseband signal and energy baseband signal in the parallel data streams onto pre-allocated subcarriers according to the result of the modulation and pre-allocation; a parallel-serial conversion unit, configured to convert the parallel data streams into a serial data stream and transmit it to an antenna unit; and an antenna unit, configured to transmit the serial data stream output from the parallel-serial conversion unit.

2. The transmitting system for multi-carrier broadband simultaneous information and energy transfer of claim 1, wherein the signal management control system comprises: a channel parameter acquiring unit, configured to acquire channel quality parameters; an optimization algorithm processing unit, configured to optimize energy signal and information signal based on preset optimization objectives and constraints; wherein the preset optimization objectives involve number of energy baseband signal carriers, power, and information transfer rate of information baseband signal; and the constraints involve: the power acquired by the receiver being greater than or equal to a minimum power required by the operation of the receiver per unit time; the sum of powers of energy signals on the subcarriers being less than or equal to a total power of the energy signals; an average power spectral density on each of subcarrier bands being less than or equal to a given parameter value; and a sum of powers of information signals on the subcarriers being less than or equal to a total power of the information signals; and a pre-allocation parameter unit, configured to generate a pre-allocation parameter set according to an optimization result of the optimization algorithm processing unit.

3. The transmitting system for multi-carrier broadband simultaneous information and energy transfer of claim 2, wherein the pre-allocation parameter set comprises an information baseband signal pre-allocation parameter set and an energy baseband signal pre-allocation parameter set; wherein the information baseband signal pre-allocation parameter set comprises: an information signal power allocation set; and an information signal subcarrier allocation set; and wherein the energy baseband signal pre-allocation parameter set comprises: an energy signal subcarrier allocation set; an energy signal power allocation set; and the total power of energy signals.

4. The transmitting system for multi-carrier broadband simultaneous information and energy transfer of claim 3, wherein the baseband signal generating unit comprises an information baseband signal generating unit and an energy baseband signal generating unit; and the energy baseband signal generating unit performs power allocation on energy baseband signal data streams according to the energy signal power allocation set and the total power of the energy signals in the energy baseband signal pre-allocation parameter set, and adds subcarrier allocation information into frame headers of corresponding energy baseband signal data streams according to the energy signal subcarrier allocation set.

5. The transmitting system for multi-carrier broadband simultaneous information and energy transfer of claim 2, wherein the encoding unit comprises an information baseband signal encoding unit and an energy baseband signal encoding unit; wherein the information baseband signal encoding unit performs convolutional encoding on the information baseband signal; and the energy baseband signal encoding unit performs quadrature encoding on the energy baseband signal.

6. The transmitting system for multi-carrier broadband simultaneous information and energy transfer of claim 2, wherein the modulation unit comprises an information baseband signal modulation unit and an energy baseband signal modulation unit; wherein the energy baseband signal modulation unit performs spectrum spreading modulation on the energy baseband signal.

7. The transmitting system for multi-carrier broadband simultaneous information and energy transfer of claim 6, wherein the energy baseband signal modulation unit comprises an impulse forming filtering module, a spreading module and a mixing module three of which are connected sequentially.

8. The transmitting system for multi-carrier broadband simultaneous information and energy transfer of claim 2, wherein a guard interval inserting unit is arranged between the modulation unit and the parallel-serial conversion unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a structural schematic view of a transmitting system for multi-carrier broadband simultaneous information and energy transfer;

(2) FIG. 2 is a structural schematic view of a specific embodiment of the transmitting system for multi-carrier broadband simultaneous information and energy transfer; and

(3) FIG. 3 is a structural schematic view of a receiving system for multi-carrier broadband simultaneous information and energy transfer.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(4) Principles and characteristics of the present invention are described below in connection with accompanying drawings, and examples are merely provided to illustrate the present invention, rather than limiting the scope of the present invention.

(5) FIG. 1 is a structural schematic view of a transmitting system for multi-carrier broadband simultaneous information and energy transfer. As shown in FIG. 1, a transmitting system for multi-carrier broadband transmitting system is provided, which comprises:

(6) a signal management control system, configured to match with an optimization algorithm, perform pre-allocation of carrier, power and frequency spectrum on information signal data stream and energy signal data stream in a baseband signal dynamically based on channel quality parameters, so as to generate a pre-allocation parameter set;

(7) a baseband signal generating unit, configured to generate information baseband signal and energy baseband signal corresponding to the pre-allocation parameter set;

(8) an encoding unit, configured to encode the information baseband signal and the energy baseband signal respectively so as to generate corresponding encoded information baseband signal and encoded energy baseband signal;

(9) a serial-parallel conversion unit, configured to perform serial-parallel conversion on the encoded information baseband signal and the encoded energy baseband signal to generate parallel data streams;

(10) a mapping unit, configured to classify the parallel data streams and perform corresponding modulation and pre-allocation on the information baseband signal and energy baseband signal in the parallel data streams according to the pre-allocation parameter set;

(11) a modulation unit, configured to modulate the information baseband signal and energy baseband signal in the parallel data streams onto pre-allocated subcarriers according to the result of the modulation and pre-allocation;

(12) a parallel-serial conversion unit, configured to convert the parallel data streams into a serial data stream and transmit it to an antenna unit; and

(13) an antenna unit, configured to transmit serial data stream output from the parallel-serial conversion unit.

(14) FIG. 2 is a structural schematic view of a specific embodiment of the transmitting system for multi-carrier broadband simultaneous information and energy transfer. As shown in FIG. 2, in this specific embodiment, the signal management control system comprises: a channel parameter acquiring unit, an optimization algorithm processing unit and a pre-allocation parameter unit.

(15) The signal management control system, may match with an optimization algorithm, perform pre-allocation of carrier, power and frequency spectrum on information signal data stream and energy signal data stream in a baseband signal dynamically based on channel quality parameters, so as to generate a pre-allocation parameter set, and the specific process may be implemented as follows.

(16) The channel parameter acquiring unit of the signal management control system may acquire the channel quality parameters; and the optimization algorithm processing unit may optimize the energy signals and the information signals according to preset optimization objectives and constraints; the preset optimization objectives involve number of carriers of the energy signals, power, and information transfer rate of the information signals; and the constraints involve the power acquired by the receiver being equal to or greater than the minimum power required for the operation mode of the receiver, the sum of powers of the energy signals on the subcarriers being less than or equal to the total power of the energy signals, the average power spectral density on each of subcarrier frequency bands being less than or equal to a given parameter value, and the sum of powers of the information signals on the subcarriers being less than or equal to the total power of the information signals.

(17) In this specific embodiment, the specific optimization process carried out by the optimization algorithm processing unit may comprise the following steps:

(18) Assuming that the total power of baseband signals at the transmitting end is P, and that the total power allocated to the information baseband signal and the total power allocated to the energy baseband signal are PI and PE, respectively, then P.sub.I+P.sub.E=P; the set of all the signal carriers is Sc, then Sc=Sc.sub.ESc.sub.I, wherein Sc.sub.E is a set of energy signal subcarriers, and Sc.sub.I is a set of information signal subcarriers; the energy acquired by the receiving end is Q, then Q=P.sub.E, wherein is an energy efficiency coefficient; a channel parameter vector is h, wherein h=[h.sub.1, h.sub.2 . . . h.sub.N].sup.T; and the total number of carriers is N, and the number of carriers allocated to the information signal and the energy signal are N.sub.I and N.sub.E, respectively, then N=N.sub.I+N.sub.E. Information symbols of the information baseband signal and energy symbols of the energy baseband signal are S.sub.I(n) and S.sub.E(n), respectively, n=1, 2, . . . , m; mN; wherein:

(19) $S_I\left(n\right)=\left[\begin{array}{c}{S}_{I1}\\ \mathrm{.Math.}\\ S_{\mathrm{Im}}\end{array}\right],S_E\left(n\right)=\left[\begin{array}{c}{S}_{E1}\\ \mathrm{.Math.}\\ S_{\mathrm{Em}}\end{array}\right]$

(20) S.sub.I1S.sub.Im are the 1.sup.st to m.sup.th information symbols of the information baseband signals, respectively, S.sub.E1S.sub.Em are the 1.sup.st to m.sup.th energy symbols of the energy baseband signals, respectively, and E[S.sup.2.sub.I(n)] and E[S.sup.2 .sub.E(n)] represent the energy of the information signal and the energy of the energy signal respectively. Therefore, the power Q acquired by the receiving end may be represented in the following relation:

(21) $Q=<\underset{\_}{h},\underset{\_}{E}\left[S_E^2\left(n\right)\right]>,i=1\mathrm{.Math.}{N}_E,$
that is,
Q=h.sub.i*E[S.sup.2.sub.E(1)]+h.sub.2*E[S.sup.2.sub.E(2)]+ . . . +h.sub.N.sub.E*E[S.sup.2.sub.E(h.sub.N.sub.E)];

(22) The power P.sub.E of the energy signal may be represented by the following relation:

(23) $P_E=\underset{n=1}{\overset{N_E}{.Math.}}E\left[S_E^2\left(n\right)\right]\text{:}$

(24) Allocation and optimization of the power, carriers and spectrum on the information baseband signal and the energy baseband signal may be performed according to the minimum energy required by the receiving end for operation and channel feedback information. The minimum operating power required by the receiving end should be understood as the minimum power required by any of the various operating modes of the receiving end. for example, when the receiving end is in a non-charging mode, the minimum operating power required by the receiving end may be the minimum operating power required by a receiving end circuit; and when the receiving end is in a charging mode, the minimum operating power required by the receiving end may be a sum of the minimum power required by the receiving end circuit for its own operation and the power required for charging.

(25) In this specific embodiment, the optimization algorithm processing unit may include a first optimization processing unit and a second optimization processing unit, said first optimization processing unit may determine a first pre-allocation parameter set for a first baseband signal based on a first optimization parameter set according to a first optimization objective and a first constraint set; and said second optimization processing unit may determine a second pre-allocation parameter set for a second baseband signal based on the first pre-allocation parameter set and a second optimization parameter set according to a second optimization objective and a second constraint set.

(26) In this embodiment, the first baseband signal is the energy baseband signal, and the first optimization objective involves minimizing the number of energy signal carriers N.sub.E and the total power of the energy signal P.sub.E when the conditions in the first constraint set are met.

(27) Said first constraint set involves: 1. the power Q acquired by the receiving end being greater than or equal to the minimum operating power P.sub.min required by the receiving end, that is, QP.sub.min; 2. the sum of power of energy signal on the subcarriers at the transmitting end being less than or equal to the total power of the energy signal in the baseband signal; and 3. an average power spectral density on each subcarrier band being less than or equal to a given parameter value A, that is, satisfying E[S.sup.2.sub.E(n)]/B<A, wherein B is a channel bandwidth on each subcarrier.

(28) Said first optimization parameter set comprises the following parameters: the set of subcarriers in energy signal Sc.sub.E, the minimum operating power P.sub.min, required by the receiving end, the channel bandwidth B on each of subcarriers, the average power spectral density A on each of subcarriers and the channel parameter vector h.

(29) Said first pre-allocation parameter set comprises the following parameters: the energy signal subcarrier allocation set, the energy signal power allocation set and the total power P.sub.E of the energy signals.

(30) The second baseband signal is the information baseband signal, and the second optimization objective involves maximizing an information transfer rate R when the conditions in the second constraint set are met; and the second constraint set involves the sum of the power of the information signal on the subcarriers being less than or equal to the total power P.sub.E of the information signals.

(31) The second optimization parameter set comprises the following parameters: the information signal subcarrier set, the number of information signal subcarriers N.sub.I and the channel parameter vector h, wherein h=[h.sub.1, h.sub.2 . . . h.sub.N].sup.T.

(32) Said second pre-allocation parameter set comprises the following parameters: the information signal power allocation set and the information signal subcarrier allocation set.

(33) Based on the above, a system pre-allocation parameter set may be obtained by solving the following optimization problems.

(34) A first pre-allocation parameter set may be derived by the first optimization processing unit according to the following first optimization objective and the first constraint set: min_{h, Sc.sub.E, P.sub.min, B, A} P.sub.E, N.sub.E, wherein elements in the { } represent the first optimization parameters; s.t. (the following is the first constraint)

(35) $Q=<\underset{\_}{h},\underset{\_}{E}\left[S_E^2\left(n\right)\right]>,Q{P}_{\min }\text{:}$$\underset{n=1}{\overset{N_E}{.Math.}}E\left[S_E^2\left(n\right)\right]P_E\text{:}$$E\left[S_E^2\left(n\right)\right]/BA,n=1,2,\mathrm{.Math.},N_E\text{:}$

(36) A second pre-allocation parameter set may be derived by the second optimization processing unit according to the following second optimization objective and the second constraint set. max_{h, Sc.sub.E* , Sc.sub.I} R wherein Sc.sub.E is an optimum energy signal subcarrier allocation set; s.t. (the following is the second constraint)

(37) $\underset{n=1}{\overset{N_i}{.Math.}}E\left[S_I^2\left(n\right)\right]P_I.$

(38) In order to further explain the operating principle of the optimization process, detailed description will be made below with reference to a specific solving process.

(39) The first optimization processing unit has four solving steps of S1-S4 exemplified as follows: S1. Initializing N.sub.E=1, and the subcarrier set Sc.sub.E= ( is a null set); S2. Finding an energy signal subcarrier allocation set Sc.sub.E={Sc.sub.i}, i=1, 2, . . . , N.sub.E, the corresponding energy channel parameter vector is h.sub.E={h.sub.i}, i=1, 2, . . . , N.sub.E, and the power acquired by the receiving end may be maximized through the optimization algorithm (for example, a water-filling algorithm) when the conditions in the first constraint set are met. Specifically, the algorithm is as follows: Sub-step S21: Find Sc.sub.8={Sc.sub.1}, i=1 . . . N.sub.2;

(40) $s.t.\max Q,Q{P}_{\min }\text{:}$$\underset{n=1}{\overset{N_E}{.Math.}}E\left[S_E^2\left(n\right)\right]P_E\text{:}$$E\left[S_E^2\left(n\right)\right]/BA,n=1,2,\mathrm{.Math.},N_E\text{:}$ Sub-step S22: Select the optimum energy signal subcarrier set Sc.sub.E*=argmin P.sub.E from a plurality of sets which are found through S21, wherein argmin P.sub.E represents an parameter condition when the value of P.sub.E is minimized; meanwhile, determine the optimum energy signal power allocation set {E*[S.sup.2.sub.E(n)]} and the optimum power acquired by the receiving end

(41) $Q^{*}=<\underset{\_}{h},{\underset{\_}{E}}^{*}\left[S_E^2\left(n\right)\right]>,$
n=1, 2, . . . N.sub.2. S3. If step S2 has no solution, then let N.sub.E=N.sub.E+1, and let Sc.sub.E= to repeat step S2 and S3. S4. If step S2 has a solution, then Sc.sub.E*, N.sub.E and P.sub.E are determined.

(42) The second optimization processing unit has a solving step of S5 exemplified as follows. S5. When the optimum energy signal subcarrier set Sc.sub.E* is determined, the corresponding information signal subcarrier set Sc.sub.I is also determined, Sc.sub.I={Sc.sub.i}; the number of information signal subcarriers N.sub.I=NN.sub.E; and the corresponding information channel parameter vector h.sub.I={h.sub.i}, wherein i=1, 2, . . . , N.sub.I.

(43) The solving process for optimization of the information transfer rate of the system is as follows:

(44) $\mathrm{max\_}\left\{\underset{\_}{h},{\mathrm{Sc}}_E^{*},{\mathrm{Sc}}_I\right\}R$$s.t.\underset{n=1}{\overset{N_i}{.Math.}}E\left[S_I^2\left(n\right)\right]P_i.$

(45) The optimum information signal power allocation set {E*[S.sup.2.sub.I(n)]} and the optimum information signal subcarrier set Sc.sub.I* may be determined through solving, so as to finally obtain the optimum information transfer rate R*=argmax R, wherein n=1, 2, . . . , N.sub.I.

(46) Wherein, R*=argmax R is specifically expressed as:

(47) $R^{*}=B\underset{n=1}{\overset{N_i}{.Math.}}{\log }_2\left(1+\frac{E^{*}\left[S_I^2\left(n\right)\right]}{N_{0}B}\right)$

(48) Wherein, n=1, 2, . . . , N.sub.I, and N.sub.0 is a noise power density parameter.

(49) Thus, the first pre-allocation parameter set and the second pre-allocation parameter set are obtained through the above-described optimization.

(50) The pre-allocation parameter unit may be configured to generate a pre-allocation parameter set according to the optimization result of the optimization algorithm processing unit, and the pre-allocation parameter set may comprise an information baseband signal pre-allocation parameter set and an energy baseband signal pre-allocation parameter set; the information baseband signal pre-allocation parameter set may comprise an information signal power allocation set and an information signal subcarrier allocation set; and the energy baseband signal pre-allocation parameter set may comprise an energy signal subcarrier allocation set, an energy signal power allocation set and the total power of energy signals.

(51) In this embodiment, the baseband signal generating unit may comprise an information baseband signal generating unit and an energy baseband signal generating unit. The energy baseband signal generating unit may perform power allocation on energy baseband signal data streams according to the energy signal power allocation set and the total power of the energy signals in the energy baseband signal pre-allocation parameter set, and add subcarrier allocation information to frame headers of corresponding energy baseband signal data streams according to the energy signal subcarrier allocation set. The information baseband signal generating unit my be configured to generate information baseband signals according to specific transfer demands, perform power allocation on the information baseband signal data streams according to the information signal power allocation set, and add subcarrier allocation information to frame headers of corresponding information baseband signal data streams according to the information signal subcarrier allocation set. Information baseband signals generated by the baseband signal generating unit is high-rate serial information stream, and the energy baseband signal generated is high-power serial energy stream.

(52) In this embodiment, the encoding unit may comprise an information baseband signal encoding unit and an energy baseband signal encoding unit; the information baseband signal encoding unit may perform convolutional encoding on the information baseband signal; and the energy baseband signal encoding unit may perform quadrature encoding on the energy baseband signal. In order to protect the baseband signals and improve bit error performance of the system, two paths of baseband signal need to be effectively encoded separately, wherein the information signals contains more useful data which need to be encoded in some encoding manners with high reliability, while the energy signal only needs to be identified and transmitted, so that the encoding manner for the energy signal can be relatively simple.

(53) After being encoded by the encoding unit, the information baseband signal and energy baseband signal are transmitted into the serial-parallel conversion unit for serial-parallel conversion so as to output parallel data streams. In order to perform multi-carrier broadband modulation, high-rate serial information stream must be converted into low-rate parallel information streams, and high-power serial energy stream must be converted into low-power parallel energy streams.

(54) In this specific embodiment, the mapping unit may perform corresponding carrier modulation pre-allocation on the information baseband signal and the energy baseband signal in the parallel data streams based on power allocation information and subcarrier allocation information in the frame headers of the energy baseband signal and the information baseband signal in the data streams according to the pre-allocation parameter set.

(55) In this embodiment, the modulation unit may comprise an information baseband signal modulation unit and an energy baseband signal modulation unit. Information signal streams are modulated to a signal form suitable for pass band transmission through information modulation carried out by the information baseband signal modulation unit according to the result of carrier modulation pre-allocation, and are shifted to a preset band. As the average power spectral density (PSD) of the energy baseband signals may exceed the safety standard, in this embodiment, the energy baseband signal modulation unit first performs spectrum spreading modulation on the energy baseband signals to decrease the average power spectral density, and then modulates the energy baseband signals using preset subcarriers. In this embodiment, the energy baseband signal modulation unit comprises an impulse forming filtering module, a spreading module and a mixing module three of which are connected sequentially. The energy baseband signals are first subjected to impulse forming processing in the impulse forming filtering module, then are spread by the spreading module using spreading codes, and then are transmitted into the mixing module for up-conversion processing using preset subcarriers. The modulated information signals and energy signals are converted into a serial data stream through parallel-serial conversion by the parallel-serial conversion unit, and are transmitted into the antenna unit for transmittance.

(56) In this embodiment, a guard interval inserting unit may be arranged between the modulation unit and the parallel-serial conversion unit, thus inter-symbol interference may be prevented by the guard interval inserting unit by adding guard prefixes in the information baseband signal and the energy baseband signal.

(57) In this embodiment, preferably, the energy baseband signal may be provided as the first baseband signal, and the information baseband signal may be provided as the second baseband signal. Optimizing the information baseband signal on the basis of optimization of the energy baseband signals ensures that the power acquired by the receiver reaches the minimum power required by a corresponding operating mode and guarantees that the receiver operates normally, thus the stability and reliability of the system is greatly improved. Through optimization of the information baseband signals, the power is further reasonably allocated, the communication rate is further raised, and performance of the system is further improved.

(58) FIG. 3 is a structural schematic view of a receiving system for multi-carrier broadband simultaneous information and energy transfer. As shown in FIG. 3, the present system also discloses a receiving system for multi-carrier broadband simultaneous information and energy transfer, which comprises:

(59) an antenna unit, configured to receive a serial signal transmitted from a transmitting end;

(60) a synchronization unit, configured to synchronize the received serial signal with the transmitting end in frequency and phase;

(61) a channel estimation unit, configured to generate channel quality parameters and feed the channel quality parameters back to the transmitting system for multi-carrier broadband simultaneous information and energy transfer;

(62) a serial-parallel conversion unit, configured to convert the received serial signal into parallel signals;

(63) a receiving end mapping unit, configured to separate the information signal from the energy signal in the parallel signals;

(64) a demodulation unit, configured to demodulate the information signal and the energy signal respectively to obtain information baseband signal and energy baseband signal;

(65) a parallel-serial conversion unit, configured to convert the parallel information baseband signal and energy baseband signal into a serial signal;

(66) a decoding unit, configured to decode the information baseband signal in the serial signal; and

(67) a rectification unit, configured to filter and rectify the energy baseband signal in the serial signal and converting it into DC signal to be stored in storage batteries.

(68) In this embodiment, the modulation unit may comprise an information signal modulation unit and an energy signal modulation unit. The parallel-serial conversion unit may comprise an information signal parallel-serial conversion unit and an energy signal parallel-serial conversion unit.

(69) The present invention has been described with reference to preferred embodiments which are not intended to limit the invention, and any modification, equivalent, improvement and the like made within the spirit and principle of the invention should all fall within the protection scope thereof.