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Bandwidth efficient turbo coded OFDM systems

机译：带宽高效的Turbo编码OFDM系统

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In this paper, bandwidth efficient turbo codes, commonly known as turbo trellis coded modulation (TTCM) is used in orthogonal frequency division multiplexed (OFDM) systems. It improves the error performance and spectral efficiency simultaneously, which are the major requirements for modern communication systems. The throughput can be improved by puncturing. In addition to TTCM, data interleaver (DI) is incorporated to boost the performance of the system further. BCJR algorithm is used at the receiver to decode iteratively the received turbo trellis coded interleaved OFDM signals. Frequency selective Rayleigh fading channel in presence of additive white Gaussian noise (AWGN) and frequency offset is considered. To the best of the authors' knowledge there is only one earlier work, which simultaneously addresses the problem of timing and carrier synchronization, channel estimation and turbo decoding of OFDM signals transmitted through frequency selective Rayleigh fading channels. This paper is an extension of the earlier work wherein the code rate is increased from half to unity using puncturing and TTCM. Therefore our baseline for comparison is the ideal coherent receiver.
机译：在本文中，通常在正交频分复用（OFDM）系统中使用带宽有效的Turbo码，通常称为Turbo网格编码调制（TTCM）。它同时提高了差错性能和频谱效率，这是现代通信系统的主要要求。通过打孔可以提高吞吐量。除TTCM外，还集成了数据交织器（DI）以进一步提高系统性能。接收器使用BCJR算法对接收到的Turbo网格编码交织OFDM信号进行迭代解码。考虑了存在加性高斯白噪声（AWGN）和频率偏移的频率选择性瑞利衰落信道。据作者所知，只有一项较早的工作同时解决了通过选频瑞利衰落信道传输的OFDM信号的时序和载波同步，信道估计和Turbo解码问题。本文是对早期工作的扩展，其中使用打孔和TTCM将编码率从一半增加到了一个单位。因此，我们的比较基准是理想的相干接收机。

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