北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2000, Vol. 23 ›› Issue (2): 34-37.

• 学术论文 • 上一篇    下一篇

量化AWGN信道的容量及最佳线性量化

郭文彬,杨鸿文,林锦东,庞沁华   

  1. 北京邮电大学电信工程学院,北京 100876
  • 收稿日期:1999-10-29 出版日期:2000-03-10
  • 作者简介:郭文彬(1971-), 男, 福建龙岩人, 北京邮电大学讲师, 硕士.

Capacity of Quantized AWGN Channel and Optimal Linear Quantization

GUO Wen-bin, YANG Hong-wen, LIN Jin-dong, PANG Qin-hua   

  1. School of Telecommunication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876,China
  • Received:1999-10-29 Online:2000-03-10

摘要: 分析了AWGN信道的输出被均匀量化后的信道容量,研究了基于信道容量最大化的最优量化问题. 结果表明量化比特数越多,为保持相同信道容量所需的信噪比则越少. 与无量化相比, 量化引起的信噪比损失一般在0~2 dB之间.一般采用最优量化时, 3 bit以上的量化造成的损失基本可以忽略不计. 给出了能使信道容量最大的最佳量化间隔的多项式拟合式.

关键词: 信道容量, 量化, 硬判决, 软判决

Abstract: The channel capacity of quantized AWGN channel and optimal uniform quantization has been studied.Quantization will cause 0~2 dB loss of SNR depends on the quantizer bit number and the quantization step. The performance loss caused by 3 or more bits quantizer can be negligible. We have also found the polynomial to fit the optimal quantization step that can maximize the channel capacity.

Key words: channel capacity, quantization, hard decision, soft decision

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