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首页> 外文期刊>Optical fiber technology >Bit-interleaved polar coded modulation scheme for high-order QAM encoded DDO-OFDM systems
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Bit-interleaved polar coded modulation scheme for high-order QAM encoded DDO-OFDM systems

机译：用于高阶QAM编码DDO-OFDM系统的位交织极性编码调制方案

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摘要

In the paper, a simple generation scheme of the twin-SSB-OFDM signal based on one OFDM transmitter is proposed in the direct-detection optical orthogonal frequency-division multiplexing (DDO-OFDM) system. Compared with traditional generation scheme that requires two OFDM transmitters, it has lower implementation complexity and lower cost. In addition, to enhance the spectral efficiency (SE) for DDO-OFDM system, an efficient bit-interleaved polar coded modulation (BIPCM) scheme adopting 256 quadrature-amplitude modulation (256-QAM) is proposed. Moreover, a quadratic polynomial permutation (QPP) interleaver is adopted for polar coded modulation (PCM) to further improve the overall system performance. The simulation results exhibit that the proposed scheme can achieve more than 4 dB and 5 dB Q-factor improvement compared to the conventional schemes with PCM and without BIPCM, respectively. At the same time, aided by the efficient 256-QAM BIPCM scheme, the receiver sensitivity is improved and the laser linewidth requirement is less strict compared to the conventional schemes.
机译：在本文中，在直接检测光正交频分复用（DDO-OFDM）系统中提出了一种基于OFDM发射器的双SSB-OFDM信号的简单一代方案。与需要两个OFDM发射器的传统生成方案相比，它具有较低的实现复杂性和更低的成本。另外，为了增强DDO-OFDM系统的频谱效率（SE），提出了采用256个正交幅度调制（256-QAM）的有效位交织的极性编码调制（BIPCM）方案。此外，采用二次多项式置换（QPP）交织器用于极性编码调制（PCM），以进一步提高整体系统性能。仿真结果表明，与PCM和没有BiPCM的传统方案相比，所提出的方案可以实现超过4dB和5dB Q系数改善。同时，通过高效的256-QAM BiPCM方案辅助，改善了接收器灵敏度，与传统方案相比，激光线宽要求不太严格。

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