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由于FTN(Faster Than Nyquist)系统所引起的码间串扰长度是无限长的,如何消除无限长的码间串扰,同时保证FTN系统的低复杂度检测将成为制约FTN技术继续发展的主要原因。文章以低复杂度接收为目标,重点介绍了FTN传输系统中的预编码及低复杂度均衡技术,包括:GTMH-预编码、M-BCJR算法、加窗Chase均衡和频域均衡算法,并对四种算法进行了分析对比,指出了各自的优缺点及应用场合。FTN系统中的预编码及低复杂度接收技术为其传输技术的实用化打下基础。
Since the length of inter-symbolic crosstalk caused by FTN (Faster Than Nyquist) system is infinite, how to eliminate infinite cross-talk between codes and ensure the low complexity detection of FTN system will be the main reason that restricts the continuous development of FTN technology. This paper focuses on the low complexity reception and focuses on the pre-coding and low complexity equalization techniques in FTN transmission system, including: GTMH-precoding, M-BCJR algorithm, windowed Chase equalization and frequency domain equalization algorithm. The four algorithms are analyzed and compared, pointing out their advantages and disadvantages and applications. The pre-coding and low-complexity reception in FTN system lay the foundation for the practical application of its transmission technology.