A device may demodulate a set of OFDM data-pilot symbols and select a subset of based at least in part on the position of each data pilot on a constellation map (e.g., how close the data pilot symbol is to an actual constellation point). The device may then perform a data-pilot-based phase estimation based at least in part on the selected subset. The device may also reduce the number of data pilots by partitioning a set of subcarriers into groups and selecting a representative subcarrier from each group. The phase estimation may then be based on the data pilots received on the selected subcarriers. In some cases, the device may also generate a smooth phase signal based on a linear regression algorithm including a phase averaging and a phase offset estimation and perform the phase estimation using the smooth phase signal.

A multiple-input multiple output (MIMO) receiver includes circuitry to receive a MIMO transmission through a plurality of antennas over a channel comprising two or more 20 MHz portions of bandwidth. The MIMO transmission comprises a plurality of streams, each transmitted over a corresponding spatial channel and configured for reception by multiple user stations. The MIMO receiver also includes circuitry to simultaneously accumulate signal information within at least two or more of the 20 MHz portions of bandwidth. Each 20 MHz portion comprises a plurality of OFDM subcarriers. The MIMO receiver also includes circuitry to demodulate at least one of the steams using receive beamforming techniques. In this way, multi-user protocol data units can be received.

The present disclosure provides Network Element (NE) clock synchronization using Optical Transport Network (OTN) delay measurement systems and methods such as described in ITU-T G.709 (December 2009) Interfaces for the Optical Transport Network (OTN) and G.798 (October 2010) Characteristics of optical transport network hierarchy equipment functional blocks. OTN provides a Delay Measurement (DM) function to measure fiber path latency between two network elements to within microsecond accuracy. The convergence of packet switching and OTN transport into the same network element allows the sharing of this information between the two applications. The OTN delay measurement value can be used to synchronize two network element clocks to within microsecond accuracy without the need for a costly GPS synchronization solution or reduced accuracy NTP solutions.

Methods of data allocation and signal receiving, a wireless transmitting apparatus, and a wireless receiving apparatus are provided based on orthogonal frequency division multiplexing (OFDM) technology. The wireless transmitting apparatus obtains a data stream and allocates the data stream to a first sub-carrier set. Each of the first sub-carrier set and a second sub-carrier set has sub-carriers with opposite frequencies to each other, respectively. The second sub-carrier is emptied or allocated according the data stream allocated to the first sub-carrier set. The data stream is converted into an OFDM signal transmitted through a transmitting module. The wireless receiving apparatus includes a single branch receiver for receiving a radio frequency (RF) signal and outputting a baseband signal. Subsequently, the data stream is restored from the baseband signal.

A method is provided for individually processing multiple frequency bands in a composite RF signal is disclosed. The composite RF signal is separated into a plurality of gain controlled and bandlimited frequency bands. The gain controlled and bandlimited frequency bands are then recombined to produce a controlled composite RF signal, which is then digitized by undersampling with an ADC to produce a plurality of unambiguous frequency bands convolved around baseband. The sample frequency can be substantially less than the Nyquist Limit of twice the highest frequency present for digitization. Each baseband signal is monitored for amplitude spikes therein. In response to an amplitude spike, the appropriate frequency band is modified by a control signal to hold the ADC to within its dynamic range.

Methods of data allocation and signal receiving, a wireless transmitting apparatus, and a wireless receiving apparatus are provided based on orthogonal frequency division multiplexing (OFDM) technology. The wireless transmitting apparatus obtains a data stream and allocates the data stream to a first sub-carrier set. Each of the first sub-carrier set and a second sub-carrier set has sub-carriers with opposite frequencies to each other, respectively. The second sub-carrier is emptied or allocated according the data stream allocated to the first sub-carrier set. The data stream is converted into an OFDM signal transmitted through a transmitting module. The wireless receiving apparatus includes a single branch receiver for receiving a radio frequency (RF) signal and outputting a baseband signal. Subsequently, the data stream is restored from the baseband signal.

Methods of data allocation and signal receiving, a wireless transmitting apparatus, and a wireless receiving apparatus are provided based on orthogonal frequency division multiplexing (OFDM) technology. The wireless transmitting apparatus obtains a data stream and allocates the data stream to a first sub-carrier set. Each of the first sub-carrier set and a second sub-carrier set has sub-carriers with opposite frequencies to each other, respectively. The second sub-carrier is emptied or allocated according the data stream allocated to the first sub-carrier set. The data stream is converted into an OFDM signal transmitted through a transmitting module. The wireless receiving apparatus includes a single branch receiver for receiving a radio frequency (RF) signal and outputting a baseband signal. Subsequently, the data stream is restored from the baseband signal.

A receiver for wireless power and broadband data comprises an energy harvester for extracting wireless power and one or more radio-frequency frontends configured to down-convert a received frequency band to a receiver intermediate frequency (IF) that is frequency and phase aligned with a transmitter IF. The frequency band includes broadband data and wireless power modulated on multiple orthogonal subcarriers. Coupled with the RF frontends, one or more second-level demodulators process a stream of complex values from the down-converted frequency band. A subcarriers demodulator converts these complex values from the time domain to the frequency domain, outputting a series of subcarrier specifications. A first-level demodulator then converts these subcarrier specifications into data bits, which include the broadband data. This configuration enables low-interference reception and processing of both power and data transmitted wirelessly.

Disclosed are a data transmitting method, a data receiving method, a network device and a non-transitory computer-readable storage medium. The data transmitting method may include: acquiring first data information and second data information; performing encoding processing on the first data information according to a first resource priority tag to obtain first encoded information, and performing encoding processing on the second data information according to a second resource priority tag to obtain second encoded information; performing signal modulation processing on the first encoded information to obtain first service information, and performing signal modulation processing on the second encoded information to obtain second service information, wherein the first service information comprises the first resource priority tag, and the second service information comprises the second resource priority tag; and transmitting the first service information and the second service information.

A communication method, a network device, a terminal device, and a communication system are disclosed. According to the method: A network device sends a generated M-bit OOK signal to a terminal device, where M indicates a quantity of OOK symbols carried in each OFDM symbol, a level in a time period T at an end of each OFDM symbol is the same as a level of a 1st OOK symbol in each OFDM symbol, a duration of the 1.sup.st OOK symbol is the time period T shorter than a duration of another OOK symbol in each OFDM symbol, the OFDM symbol includes a first cyclic prefix or a second cyclic prefix, and the first cyclic prefix is shorter than the second cyclic prefix.