Iterative Coded Modulation With Code Rate Flexibility for Optical Space Communications

作者：Tan Ying^*; Guo Jian Zhong; Ai Yong

来源：IEEE Photonics Technology Letters, 2009, 21(1-4): 67-69.

DOI：10.1109/LPT.2008.2008203

• Convolutional codes (CCs)
• optical space communications
• pulse-position modulation (PPM)
• single-parity-check (SPC) codes

We propose an iterative coded modulation technique with code rate flexibility for optical space communications., It is a modified version of the existing SCPPM, which consists of the serial concatenation of an outer convolutional code, an interleaver, a bit-accumulator, and pulse-position modulation (PPM), and has been demonstrated to give the best performance on an optical link modeled as PPM/Poisson channels. The primary modification is to add a single-parity-check (SPC) code. We refer to the coded modulation as SPC-SCPPM. The two codes are decoded with an iterative demodulator-decoder, using standard turbo-decoding techniques. We compare the two coded modulation techniques on a PPM/Poisson channel. The rate-1/2 SPC-SCPPM provides performance similar to the SCPPM of the same parameters. However, SPC-SCPPM has been shown to possess code rate flexibility for all rates higher than 1/2/ in contrast to SCPPM.

• 出版日期2009-2
• 单位武汉大学