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Optical spectrally efficient FDM system for electrical and optical bandwidth saving

机译：用于电气和光学带宽节约的光谱有效的FDM系统

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A newly proposed optical-spectrally efficient frequency division multiplexing (O-SEFDM) system reduces the required communication spectrum by employing non-orthogonal and overlapping sub-carriers. This results in higher spectral efficiency relative to an equivalent optical-orthogonal frequency division multiplexing (O-OFDM) delivering the same data rate. O-SEFDM technique can save spectrums in both the electrical and optical domains. However, due to the loss of orthogonality, detection of O-SEFDM signals becomes more complicated. In this work, we employ a hybrid soft Iterative Detection (ID) together with fixed sphere decoder (FSD), concurrently optimizing performance and complexity. We show that for Bandwidth Compression Factor (BCF) of up to 25 percent, we can achieve the same performance as O-OFDM. This verifies Mazo's rates of transmission 25 percent faster than the Nyquist rate. We report a 4QAM system occupying approximately the same bandwidth as that of an 8QAM with 1.6 dB improved error performance for the same transmission rate. The same system shows only minor power penalty (1 dB) relative to its 4QAM OFDM bit rate equivalent but with the advantage of 30% bandwidth saving. This study reports1 optical and electrical bandwidth saving with minor error performance degradation and paves the way for practical.
机译：一种新提出的光谱有效的频分复用（O-SEFDM）系统通过采用非正交和重叠的子载波来减少所需的通信频谱。这导致相对于提供相同数据速率的等效光正交频分复用（O-OFDM）的较高的频谱效率。 O-SEFDM技术可以节省电气和光学域中的频谱。但是，由于损失正交性，O-SEFDM信号的检测变得更加复杂。在这项工作中，我们使用混合软迭代检测（ID）与固定球体解码器（FSD），同时优化性能和复杂性。我们表明，对于高达25％的带宽压缩因子（BCF），我们可以达到与O-OFDM相同的性能。这使MAZO的传输费率比奈奎斯特率快25％。我们报告了一个4QAM系统，占据大致相同的带宽，以及8QAM，具有1.6 dB的误差性能，以获得相同的传输速率。相同的系统仅显示了相对于其4QAM的4QAM比特率等同物的次要功率惩罚（1 dB），但具有30％的带宽节省的优势。本研究报告了光学和电气带宽节省，具有轻微的误差性能下降并为实用方式铺平道路。

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