An RF PNT system may include LORAN stations. Each LORAN station may include a LORAN antenna, and a LORAN transmitter coupled to the LORAN antenna and configured to transmit a series of LORAN PNT RF pulses having a time spacing between adjacent LORAN PNT RF pulses. One or more of the LORAN stations may include a message embedding generator coupled to the LORAN transmitter and configured to generate message RF bursts based upon an input message, and with each message RF burst being in the time spacing between respective adjacent LORAN PNT RF pulses.

A synchronizer generates cross-products of In-phase (I) and Quadrature (Q) samples and stores the sign bits for the sine and cosine cross-products. The sign bits are compared to a local reference of a frame-start bit-sequence and the compare results accumulated as I and Q correlations for symbol and half-symbol sampling. Linear combinations of the accumulated I and Q correlations for the symbol and half-symbol sampling generate linear combination results for frequency bins that peak at a different implied Carrier Frequency Offset (CFO) settings. The maximum of the linear combination results is selected and the implied CFO setting for that frequency bin is applied to a demodulator to adjust the receiver's CFO setting and bit synchronization. Computational complexity is reduced since only the sign bit of each cross-product is retained for correlation with the frame-start bit-sequence. Linear combinations can support a wide CFO range.

[Object] To realize IQ imbalance correction in a more preferable aspect. [Solution] An information processing device including: a calculation unit configured to calculate an error between predetermined reference coordinates on an IQ plane and a signal point of a received predetermined reference signal on a basis of a reception result of the reference signal on which phase modulation or quadrature amplitude modulation is implemented and mapping information of the reference signal; and a generation unit configured to generate correction data for correcting a deviation of a signal point of a received signal on a basis of a calculation result of the error.

Apparatuses, methods, and systems are disclosed for transmitting and/or receiving feedback. One apparatus (300) includes a transmitter (310) that transmits (802) multiple data blocks. The apparatus (300) includes a receiver (312) that receives (804) a feedback message in a time slot. The feedback message corresponds to the multiple data blocks. The feedback message includes one or more sequences that indicate feedback information, wherein the feedback information corresponds to the multiple data blocks. The feedback message includes: a sequence of a sequence set; multiple sequences of a sequence set, wherein each sequence of the multiple sequences indicates feedback information; a sequence of a sequence set in a physical resource of a physical resource set, wherein the sequence and the physical resource indicate feedback information; and/or multiple sequences of a sequence set in a physical resource of a physical resource set, wherein the multiple sequences and the physical resource indicate feedback information.

A transmitter in a first wireless communication device and method therein are disclosed. The transmitter comprises a modulator and a rate selector configured to select a data rate. The rate selector comprises an input configured to receive input bits and an output to provide the bits with the selected data rate. The transmitter further comprises a bit to symbol mapper configured to receive the bits from the rate selector and map the bits to symbols of an arbitrary alphabet. The transmitter further comprises a spreading unit configured to spread the symbols received from the bit to symbol mapper to a chip sequence by means of a spreading code. The transmitter further comprises a re-mapping unit configured to map the chip sequence received from the spreading unit to produce signals for providing to the modulator.

A physiological information collecting system and a transceiver device thereof are configured to collect physiological information from animal bodies. The transceiver device includes a front-end circuit, a follower circuit, a quadrature delay line and an output circuit. The front-end circuit separates a discontinuous signal into an in-phase signal and a quadrature signal. The follower circuit outputs a control voltage and rotates the in-phase signal by a predetermined phase angle to output a follower signal. The quadrature delay line rotates the quadrature signal by a corresponding phase angle according to the control voltage. The output circuit synthesizes the follower signal and the quadrature signal and outputs a data signal by demodulating the discontinuous signal. Consequently, the transceiver device reduces the bandwidth range of the discontinuous signal when receiving the discontinuous signal, reduces the power consumed by the transceiver device, and demodulates the discontinuous signal with various transmission rates of different data.

Embodiments provide a data transmitter having a transmitter configured to transmit a signal and a changer for changing a signal parameter configured to change at least one signal parameter of the signal or a parameter on which the signal parameter of the signal depends, wherein the signal parameter depends on an environmental parameter in an environment of the data transmitter.

Methods, systems, and devices for wireless communications are described. A device (e.g., a base station or a user equipment (UE)) may identify a sequence length corresponding to a number of resource blocks, and select a modulation scheme based on the sequence length. The device may select, from a set of sequences associated with the modulation scheme, a sequence having the sequence length. In some examples, the set of sequences may include at least one of a set of time domain phase shift keying computer-generated sequences or a set of frequency domain phase shift keying computer-generated sequences. The device may generate a reference signal for a data transmission based on the sequence and transmit the reference signal within the number of resource blocks.

The present invention provides methods and apparatuses for implementation of cyclic prefix (CP) and demodulation reference signal (DMRS) in 2 sub-carrier pi/2 binary phase shift keying (BPSK) modulation in a communication system. DMRS symbols are interleaved with data-carrying symbols and configured such that they are alternatingly transmitted on different ones of the two sub-carriers. When a DMRS symbol is transmitted on one sub-carrier, the other sub-carrier may be unused. In implementing CP, phase rotations may be applied to modulation symbols, such that each concurrently transmitted pair of symbols is subjected to a same phase rotation. The phase rotation can be derived based on an average frequency of the two (e.g. adjacent) sub-carriers in use. The phase rotations can be updated recursively, and the update multiplied by a scaling factor.

Examples herein disclose apparatus and systems for hybrid vector based polar modulator schemes that may use a series of polar modulators to create a system of vector modulators. The resulting polar response may be de-composed into the sum of the polar modulators. This approach allows accurate phase modulation in two such links without the need for high resolution AM part to cover the IQ plane of a QAM modulator.