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On the design of full duplex wireless system with chaotic sequences

  • * Corresponding author: Ruwu Xiao

    * Corresponding author: Ruwu Xiao 

The first author is supported by the NNSFC under grant No. 61371072

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  • This paper proposes a novel approach for full duplex using chaotic sequences which is known as the asynchronous code-division duplex (Async-CDD) system. The Async-CDD system can transmit and receive signals at the same time and in the same frequency channel without time slot synchronization. The data rate of the Async-CDD system is 8 times higher than the conventional CDD system and is the same as a non-spreading system. The property of low block cross-correlation of the chaotic sequence allows the Async-CDD system achieve duplex interference suppression at any duplex delay. And the huge number of available code words/blocks of the chaotic sequence allows the Async-CDD system increase the data rate by increasing the number of multiplexed sub-channels. When both of the code length of the orthogonal chaotic code and the number of multiplexed sub-channels are 128, the orthogonal chaotic code provides 30.40 dBc self-interference suppression in average, which is 6.99 dB better than the orthogonal Gold code.

    Mathematics Subject Classification: Primary: 58F15, 58F17; Secondary: 53C35.

    Citation:

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  • Figure 1.  Application Scenario of the CDD System

    Figure 2.  The block-correlation performance of the OG code

    Figure 3.  The block-correlation performance of the OC code

    Table 1.  The Average Duplex Self-interference Suppression Performance with Different $N$

    Code Type$N$ $Q$ ${C}_{aver}$ (dBc) ${C}_{worst}$ (dBc)
    OG12812823.2818.99
    51251229.8027.21
    1024102432.6831.18
    OC12812833.7924.69
    25625637.1126.35
    51251239.7726.95
    1024102442.6525.29
     | Show Table
    DownLoad: CSV

    Table 2.  System parameter of the compared system

    $N$$W$Max. $Q$ $Q$
    CDD128+881616
    Async-CDD with OG code128-12816
    Async-CDD with OC code128-12816
     | Show Table
    DownLoad: CSV

    Table 3.  The self-interference suppression performance with different delay

    $Q$$N$The number of $C(p, q)$
    $\leq$ 24 dBc
    The number of $C(p, q)$
    $\leq$ 28 dBc
    The number of $C(p, q)$
    $\leq$ 30 dBc
    CDD with161280168256
    ZCZ code
    Async-CDD16128225256256
    with OG code
    Async-CDD1612801033
    with OC code
     | Show Table
    DownLoad: CSV
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