Multiple-subcarrier optical communication systems with subcarrier signal-point sequence
Multiple-subcarrier optical communication systems with subcarrier signal-point sequence
复制标题
具有子载波信号点序列的多子载波光通信系统
DOI：
10.1109/tcomm.2005.857152
复制
发表时间：
2005
影响因子：
8.3
通讯作者：
T. Ohtsuki
中科院分区：
文献类型：
--
作者：
S. Teramoto;T. Ohtsuki
提出了一种具有副载波信号点序列的多副载波（MS）光通信系统。我们使用具有较大最小值和较大欧几里得距离的ssp，从而使所需的直流偏置最小化，提高了错误率性能。注意，在本文提出的系统中，选择具有较大最小值的信号点，而在正交频分复用（OFDM）系统中选择具有较低的峰值-均值包络功率比（PMEPR）的信号点。因此，对于相移为/spl pi/ rad的OFDM来说，适合的ssp不一定适用于MS光通信系统。本文的主要贡献有：1)利用8相移键控和（8+1）幅相移键控，推导出具有大最小值和大欧氏距离的传输序列；2)由于设计最优序列过于复杂，我们引入了一种合理的次最优序列设计程序，取得了良好的效果。结果表明，具有ssp的MS系统的归一化功率需求和归一化带宽需求比传统的MS系统要小。
We propose a multiple-subcarrier (MS) optical communication system with subcarrier signal-point sequence (SSPS). We use the SSPSs having a large minimum value and large Euclidean distances, so that the required dc bias is minimized and the error-rate performance is improved. Note that in the proposed system, the signal points having the larger minimum value are selected, while the signal points having a lower peak-to-mean-envelope-power ratio (PMEPR) are selected in orthogonal frequency-division multiplexing (OFDM) systems. Therefore, the SSPSs good for OFDM with phase shifting by /spl pi/ rad are not necessarily effective for MS optical communication systems. The main contributions of our paper are: 1) we derive transmit sequences having a large minimum value and large Euclidean distances by using 8-phase-shift keying and (8+1)-amplitude phase-shift keying; and 2) since designing optimal sequences would be prohibitively complex, we introduce a reasonable procedure for suboptimal sequence design, obtaining good results. We show that the normalized power requirements and normalized bandwidth requirements of the MS systems with SSPS are smaller than those of the conventional MS systems.