A sub-optimum non-linear distortion compensation scheme for orthogonal multi-carrier modulation systems
A sub-optimum non-linear distortion compensation scheme for orthogonal multi-carrier modulation systems
复制标题
正交多载波调制系统次优非线性失真补偿方案
DOI：
10.1109/pimrc.1996.567511
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
S. Komaki
中科院分区：
文献类型：
--
作者：
Hideki Nishijima;M. Okada;S. Komaki
针对正交多载波调制系统，提出了一种新的非线性失真补偿方案。多载波调制被认为是在多径衰落环境下进行高速数字传输的一种有效技术。该方案基于最大似然(ML)检测，能够补偿由于非线性失真而导致的性能下降。然而，理想的最大似然接收机需要巨大的计算成本，并且是不可行的。为了减少最大似然检测所需的计算量，该方案采用了一种次优估计算法。该方案不是评估所有可能的序列，而是评估与传统逐位接收器解码的序列仅相差一位的序列。计算机仿真结果表明，该方案能有效地补偿由于非线性失真而引起的性能下降。
This paper proposes a new non-linear distortion compensation scheme for orthogonal multi-carrier modulation systems. Multi-carrier modulation is considered as an effective technique for high speed digital transmission in a multipath fading environment. The proposed scheme, which is based on the maximum likelihood (ML) detection, can compensate the performance degradation due to non-linear distortion. However an ideal ML receiver requires a huge computational cost and is not feasible. To reduce the computational cost required for ML detection, the proposed scheme employs a sub-optimum estimation algorithm. Instead of evaluating all the possible sequences, the proposed scheme evaluates sequences which differs only by one bit from the sequence decoded by the conventional bit by bit receiver. Computer simulation results show that the proposed scheme can compensate the degradation due to non-linear distortion effectively.