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Performance analysis of Viterbi decoding for 64-DAPSK and 64-QAM modulated OFDM signals

机译:对64-DAPSK和64-QAM调制OFDM信号进行维特比解码的性能分析

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摘要

The multilevel modulation techniques of 64-quadrature amplitude modulation (QAM) and 64-differential amplitude and phase-shift keying (DAPSK) have been proposed in combination with the orthogonal frequency-division multiplexing (OFDM) scheme for digital terrestrial video broadcasting (DTVB). With this system a data rate of 34 Mb/s can be transmitted over an 8-MHz radio channel. A comparison of these modulation methods in the uncoded case has been presented by Engels and Rohling (see European Trans. Telecommun., vol.6, p.633-40, 1995). The channel coding scheme proposed for DTVB by Schafer (see Proc. Int. Broadcasting Convention, Amsterdam, The Netherlands, p.79-84, 1995) consists of an inner convolutional code concatenated with an outer Reed-Solomon (RS) code. In this paper the performance of the convolutional codes is analyzed for the two modulation techniques. This analysis includes soft decision Viterbi (1971) decoding of the convolutional code. For soft decision decoding of DAPSK modulated signals a new metric is developed.
机译:结合正交频分复用(OFDM)方案,针对数字地面视频广播(DTVB),提出了64正交幅度调制(QAM)和64差分幅度和相移键控(DAPSK)的多级调制技术。 。使用该系统,可以通过8 MHz的无线电信道传输34 Mb / s的数据速率。恩格斯和罗林(Engels and Rohling)提出了在未编码情况下对这些调制方法的比较(参见European Trans。Telecommun。,第6卷,第633-40页,1995年)。舍弗(Schafer)为DTVB提出的信道编码方案(参见荷兰国际广播电视协会,1995年,第79-84页)由内部卷积码和外部里德-所罗门(RS)码组成。本文针对两种调制技术分析了卷积码的性能。该分析包括卷积码的软判决Viterbi(1971)解码。为了对DAPSK调制信号进行软判决解码,开发了一种新的度量。

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