Total factor productivity growth and technological change in the telecommunications industry
On the design of full duplex wireless system with chaotic sequences
Ruwu Xiao 1,, , Geng Li 1,2, and Yuping Zhao 1,2,
School of Electronics Engineering and Computer Science, Peking University, Beijing, China
Department of Computer Science, Yale University, New Haven, CT, USA
* Corresponding author: Ruwu Xiao
Received September 2017 Revised January 2018 Published November 2018
Fund Project: The first author is supported by the NNSFC under grant No. 61371072.
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.
Keywords: Full duplex, self-interference cancellation, code-division duplex, chaotic sequence, CDD.
Citation: Ruwu Xiao, Geng Li, Yuping Zhao. On the design of full duplex wireless system with chaotic sequences. Discrete & Continuous Dynamical Systems - S, 2019, 12 (4&5) : 783-793. doi: 10.3934/dcdss.2019052
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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)
OG 128 128 23.28 18.99
512 512 29.80 27.21
1024 1024 32.68 31.18
OC 128 128 33.79 24.69
Table 2. System parameter of the compared system
$N$ $W$ Max. $Q$ $Q$
CDD 128+8 8 16 16
Async-CDD with OG code 128 - 128 16
Async-CDD with OC code 128 - 128 16
Table 3. The self-interference suppression performance with different delay
$Q$ $N$ The number of $C(p, q)$
$\leq$ 24 dBc The number of $C(p, q)$
$\leq$ 30 dBc
CDD with 16 128 0 168 256
ZCZ code
Async-CDD 16 128 225 256 256
with OG code
Async-CDD 16 128 0 10 33
with OC code
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Ruwu Xiao Geng Li Yuping Zhao