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空时编码利用多天线阵列提供的并行信道传输信息,可以在保证通信质量的前提下进一步提高信息传输速率。介绍了笔者在正交空时码、空时网格码、酉空时码、差分空时码、混合空时码等方面的工作。采用类脉冲位置调制定义了负数、共轭、求补等运算,将编码矩阵转化为一个用脉冲位置表示的实数矩阵。分析了不同发射天线/接收天线数目、大气湍流强度与系统误码率之间的关系。讨论了差分空时码、酉空时码在不同大气湍流条件下的误码率特性;将分层空时码和空时分组码相结合,对复用增益和分集增益进行合理的折中,提出了一种适合于IM/DD式光通信的混合空时编码方案。
The space-time coding uses the parallel channel provided by the multi-antenna array to transmit information, which can further improve the information transmission rate under the premise of ensuring the communication quality. This paper introduces the author’s work in orthogonal space-time codes, space-time grid codes, unitary space-time codes, differential space-time codes, mixed space-time codes and so on. Class-like pulse position modulation is used to define negative numbers, conjugates, and complements. The encoding matrix is transformed into a real matrix expressed in terms of pulse positions. The relationship between the number of different transmitting antennas / receiving antennas, the intensity of atmospheric turbulence and the system error rate is analyzed. The error rate characteristics of differential space-time code and unitary space-time code under different atmosphere turbulence conditions are discussed. By combining layered space-time code and space-time block code, the multiplexing gain and diversity gain are reasonably compromised, A hybrid space-time coding scheme suitable for IM / DD optical communication is proposed.