Novel SNR Estimation for Turbo Decoding over Rayleigh Fading Channels
It is known that the signal to noise ratio (SNR)mismatch may cause degradation in error correction performance of turbo decoding. In order to obtain desired coding gain, a turbo decoder can perform online SNR estimation from the received data in each code block. This paper presents a novel SNR estimation method for turbo decoding over Rayleigh fading channels by utilizing the estimate ratio of the fourth moment to the fourth power of mean absolute value over the received data. Analysis demonstrates that the proposed method is superior to the previous method in the estimation accuracy, especially when code block length is small. Furthermore, simulation shows that nearly optimal bit error rate(BER) can be achieved even when the code block length is reduced to 400 bits (200 information bits, half code rate), while the previous method results in noticeable BER degradation.
Hongyu Zhao Pingzhi Fan P.Takis Mathiopoulos
School of Information Science and Technology Southwest Jiaotong University Chengdu, Sichuan Province Institute for Space Applications and Remote Sensing National Observatory of Athens Metaxa and V.Pavl
国际会议
2006年IEEE信息理论国际会议(Proceedings of 2006 IEEE Information Theory Workshop ITW06)
成都
英文
179-183
2006-10-22（万方平台首次上网日期，不代表论文的发表时间）