| Nowadays,in the case of shortage of band resources,how to achieve a good compromise between the reliability and effectiveness of the transmission of the communication system is the eternal theme in the field of communication research.In particular,with the development of the Internet of Things,facing increasingly complex channel environments,such as power line channels and underwater acoustic channels,Orthogonal Frequency Division Multiplexing(OFDM)and direct sequence code division multiple access(DS/CDMA)technology have good anti-multipath interference capability,however,these traditional technologies also have great limitations,for example,they have a high demand for synchronization,and the realization of accurate synchronization often needs a lot of cost.Therefore,for these complex band-limited communication scenarios,the design of a new program is particularly important.In this paper,a novel differential chaotic bit-interleaved coded modulation(DC-BICM)system is proposed for band-limited transmission.This system combines Protograph-based Low Density Parity Check(P-LDPC)codes with constellation-based M-ary differential chaos shift keying(DCSK)modulation by one bit-wise interleaving.BER simulation results show that the system has higher coding gain compared with constellation-based M-ary DCSK modulation system with the same spectral efficiency over multipath Rayleigh fading channels.At the same time,several simulations and P-EXIT analysis have been done to analyze the performance of the proposed system.It is found that there is a big room for optimization of the system by comparing decoding thresholds and simulation results.Moreover,the system just with partial channel state information(CSI)has better performance,and lower complexity compared with the traditional bit-interleaved coded modulation(BICM)direct-sequence-spread-spectrum(DS/SS)system.As a result,the DC-BICM system is a good candidate for band-limited transmission. |
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