Unary Coding Design for Simultaneous Wireless Information and Power Transfer With Practical M-QAM

Abstract

Relying on the propagation of modulated radio-frequency (RF) signals, we can achieve simultaneous wireless information and power transfer (SWIPT) to support low-power communication devices. In this paper, we studied a unary coding controlled SWIPT system by considering a practical M-QAM.Markov chains are exploited for characterising coherent binary information source and for modelling the generation process of modulated symbols. Therefore, both mutual information between the unary coded information source and destination and average energy harvesting performance of the SWIPT receiver are analysed in semi-closed-form. With the aid of the genetic algorithm, the sub-optimal codeword distribution of coded information source is obtained by maximising the average energy harvesting performance, while satisfying the requirement of the mutual information. Simulation results show that a higher-level unary code and a lower-order M-QAM results in higher WPT performance, when the maximum transmit power of the modulated symbol is fixed.

Wideband Waveforming for Integrated Data and Energy Transfer: Creating Extra Gain Beyond Multiple Antennas and Multiple Carriers

“…In order to improve its efficiency, coding and modulation were relied upon for generating proper IDET waveforms. Specifically, Zhao et al [6] characterised the generation of coherent binary codes and modulation symbols by exploiting Markov chains, and obtained the optimal codebook to maximise WET performance with mutual information constraints. Zhang et al [7] then investigated the transmit spatial modulation (TSM) with the IDET.…”

Multi-sinusoidal waveform shaping for integrated data and energy transfer in aging channels

“…Coding and modulation can be relied upon for adjusting waveforms for IDET [9][10][11][12][13]. The first design guide for a coding and modulation controlled IDET system was proposed in [9].…”

“…The first design guide for a coding and modulation controlled IDET system was proposed in [9]. Specifically, Zhao et al [10] proposed a unary coding based IDET encoder by considering a practical M-QAM. In [11], the codeword distribution in a unary encoder was designed to maximise the WET performance with the required WDT constraint.…”