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HARQ-Chaotic: Analog Chaotic Code Applied in HARQ Scheme of Wireless Communication System

机译：HARQ混沌：在无线通信系统HARQ方案中应用模拟混沌代码

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This paper proposes a novel symbol-level combining hybrid automatic repeat request (HARQ) scheme based on analog chaotic code and named HARQ-Chaotic. The transmitter of HARQ-Chaotic adopts analog chaotic code to encode Quadrature Amplitude Modulation (QAM) symbols of retransmission packets to combat fading and noise. As the analog chaotic code can only handle sources with amplitudes in the range of [-0.5, 0.5], QAM symbols must be scaled into this range. We derived the optimal scaling factor through theoretical analysis. A joint algorithm combining with novel soft chaotic decoder and novel soft QAM demapper is proposed for the receiver to enhance the performance of the whole communication system. We implemented HARQ-Chaotic with LDPC codes and 16-QAM/64-QAM to carry out simulations in both AWGN channels and multipath fading channels. Massive simulation results demonstrate that the proposed HARQ-Chaotic has 1dB-4dB gain over traditional HARQ-Chase combining (HARQ-CC) scheme in block error rate (BLER) performance.
机译：本文提出了一种基于模拟混沌代码的混合自动重复请求（HARQ）方案的新型符号级，并命名为HARQ-Chaotic。 HARQ-Chaotic的发射机采用模拟混沌码来编码重传数据包的正交幅度调制（QAM）符号，以对抗衰落和噪声。由于模拟混沌代码只能在[-0.5,0.5]的范围内，只能处理幅度的源，QAM符号必须缩放到此范围内。我们通过理论分析衍生出最佳缩放因子。提出了一种与新颖的软混沌解码器和新型软QAM解压器组合的联合算法，以增强整个通信系统的性能。我们通过LDPC代码和16-QAM / 64-QAM实现了HARQ混沌，在AWGN通道和多径衰落通道中进行模拟。大规模仿真结果表明，所提出的HARQ混沌具有超过传统HARQ-CHASE组合（HARQ-CC）方案的1dB-4dB增益，块误差率（BLER）性能。

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