7 results about "Constant envelope modulation" patented technology

A communication method and apparatus for simultaneous information and power transfer, and a storage medium. The method comprises: mapping n1 power transfer modulation symbols and n2 data modulation symbols to different resource elements of a first resource block, wherein the power transfer modulation symbols are obtained on the basis of time-domain constant envelope modulation, such that time-domain modulation symbols of a power transfer signal have the characteristic of a constant amplitude; and then, a first communication apparatus sending the n1 power transfer modulation symbols and the n2 data modulation symbols by means of the first resource block. The effect of reducing the PAPR of a wireless signal during simultaneous information and power transfer is achieved.

A transmitter may obtain a plurality of symbols encoding data to transmit wirelessly. A transmitter may transform the plurality of symbols using a unitary braid division multiplexing transform to produce a plurality of transformed symbols. A transmitter may scale the plurality of transformed symbols produce a plurality of scaled symbols. A transmitter may modulate a carrier signal by the plurality of scaled symbols to produce a constant envelope signal. A transmitter may transmit the modulated signal.

The application relates to an iterative channel estimation method of a constant envelope modulation system based on DBD decomposition, which comprises the following steps: S1, DBD decomposition is carried out on a constant envelope modulation signal to obtain a decomposition form of the constant envelope modulation signal, and then sampling is carried out on a received signal to obtain a sampling result; S2, an initial estimation value of a channel parameter is obtained; S3, Viterbi demodulation and LDPC decoding are carried out to obtain bit information; S4, a reconstruction signal is generated; S5, the channel parameter is re-estimated to obtain a new channel estimation result; and S6, the new channel estimation result is taken as a current channel estimation result, and S3-S5 are repeated. Compared with the prior art, the application has the advantages of effectively reducing time complexity and space complexity, improving channel estimation performance and the like.

A transmitter may obtain a plurality of symbols encoding data to transmit wirelessly. A transmitter may transform the plurality of symbols using a unitary braid division multiplexing transform to produce a plurality of transformed symbols. A transmitter may scale the plurality of transformed symbols produce a plurality of scaled symbols. A transmitter may modulate a carrier signal by the plurality of scaled symbols to produce a constant envelope signal. A transmitter may transmit the modulated signal.

The invention discloses a non-orthogonal multiple access system communication method based on index modulation and constant envelope modulation. According to the method, the number of activated subcarriers is selected at a sending end according to the bit number of data needing to be transmitted by users, index modulation is carried out on the subcarriers of all the users, and OFDM signals are embedded into phases of constant envelope signals through phase modulation after signals of all the users are superposed; and at a receiving end, firstly eliminating the cyclic prefix of the received signal, then carrying out channel estimation and equalization processing through pilot frequency, then deducing channel frequency response corresponding to each symbol by adopting a cubic spline interpolation method, and finally demodulating the user signal. According to the method, the robustness of the non-orthogonal multiple access system can be enhanced, and the low bit error rate can still be kept when the power difference between the users is not significant. The peak-to-average power ratio of the non-orthogonal multiple access system is greatly reduced, and the power consumption cost is reduced. And the anti-interference capability of the communication system on the frequency selective fading under the Rayleigh channel is obviously enhanced.

The invention discloses a data and energy simultaneous transmission communication method and device and a storage medium. In the method, n1 energy transfer modulation symbols and n2 data modulation symbols are mapped to different resource units of a first resource block, the energy transfer modulation symbols are obtained based on time-domain constant envelope modulation, so that the time-domain modulation symbols of energy transfer signals have the characteristic of constant amplitude, and then a first communication device transmits the energy transfer signals to the first resource block through the first resource block. And n1 energy transmission modulation symbols and n2 data modulation symbols are sent, so that the effect of reducing the PAPR of the wireless signal in the data and energy simultaneous transmission process is realized.

Aspects of the present disclosure relate to a method for constant envelope modulation. The method includes processing a first time-domain in-phase and quadrature (I / Q) composite signal, processing a second time-domain I / Q composite signal, combining the first time-domain I / Q composite signal and the second time-domain I / Q composite signal into a doublet pair signal, and forming a sum of the first waveform and the second waveform to obtain a constant envelope. The first time-domain I / Q composite signal is described by a first waveform and contains an intended high order modulation with a high peak-to-average ratio (PAR) and an envelope modulation as a function of time, and the second time-domain I / Q composite signal is described by a second waveform with an envelope change over time and a phase change over time of the second waveform defined as a function of the first waveform.