Abstract

To overcome the error propagation and improve the communication efficiency of the chaotic pulse position modulation (CPPM) system, the bipolar chaotic pulse position modulation (BCPPM) communication system is proposed here. In BCPPM, every two-bit data are set as a group. The first bit and the discrete chaotic map determine the position of sent pulse, while the second bit determines the polarity of sent pulse. Each pulse in the channel contains two-bit information, so this scheme improves the communication efficiency. A (255,175) cyclic low-density parity-check code (LDPC) was designed, and its generator matrix and parity check matrix are cycled. Furthermore, the constructed BCPPM communication system is utilized in the cyclic LDPC aiming to mitigate the effect of noise. In the transmitter, it uses the encoder structure of cyclic codes while the min-sum algorithm is deployed to decode in the receiver. The analysis indicates that the proposed system is secure, insensitive to the channel distortion and convenient for multiple access communication. The simulation results show that in the additive white Gaussian noise (AWGN) channel, multipath channel, multiuser model, and hybrid communication environment, the BCPPM system has lower bit error rate (BER) compared with those of the CPPM and chaotic pulse on-off-keying (CPOOK). In addition, using cyclic LDPC codes, the system is more suitable for hardware implementation.

Highlights

  • The ultra wideband (UWB) communication system is widely used in communication systems especially in military applications

  • In order to further improve the efficiency of communication, a bipolar chaotic pulse position modulation (BCPPM) communication system was put forward in this paper

  • A (255,175) cyclic-low-density parity-check code (LDPC) code designed, and it is used for the BCPPM system to reduce the system bit error rate (BER)

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Summary

Introduction

The ultra wideband (UWB) communication system is widely used in communication systems especially in military applications. A method was proposed as the chaotic pulse on-off keying (CPOOK) [8], which does not have any feedback loop in its structure It has lower bit error rate (BER) than the CPPM system in the. A method of MCPPM was proposed in [9], where the delay block, which is decided by the data, is sent outside the feedback loop In this way, the communication system overcomes the error propagation phenomenon. The low-density parity-check code (LDPC) [10] demonstrates a good performance close to the Shannon limit and low decoding complexity and flexible structure These factors make it an appropriate option in the research field of channel coding [11,12]. A (255,175) cyclic-LDPC code designed, and it is used for the BCPPM system to reduce the system BER

Bipolar chaotic pulse position modulation communication system
Cyclic LDPC codes
Simulation and analysis
Conclusion

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