Multi-Channels Turbo Equalization For M-Ary Orthogonal Modulation Signal
2017 9TH INTERNATIONAL CONFERENCE ON MODELLING, IDENTIFICATION AND CONTROL (ICMIC 2017)(2017)
摘要
M-ary orthogonal modulation is widely used in wireless communication systems as a frequency spread method. To improve the demodulation performance of this signal with low signal to noise ratio (SNR) in severe intersymbol interference (ISI) channel, a multi-channels turbo equalization algorithm is proposed. In this algorithm, a new soft demapping and mapping method is presented and the extrinsic information is exchanged between the multi-channels equalizer and the decoder. Simulation indicates gains of up to 4.5 dB relative to the hard symbol decision algorithm and 3.5dB relative to the single-channel turbo equalization algorithm can be achieved after two iterations.
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关键词
M-ary orthogonal modulation,multi-channels turbo equalization,soft demapping,soft mapping
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