NDLI: Performance comparison of hybrid partial response detectors over frequency-selective fading channels

Content Provider	IEEE Xplore Digital Library
Author	Yanjie Peng Xinming Huang
Copyright Year	2014
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Worcester Polytech. Inst., Worcester, MA, USA (Yanjie Peng; Xinming Huang)
Abstract	Frequency-selective fading channels are encountered in many modern wireless communication systems. In order to combat the intersymbol interference (ISI) introduced by such fading, equalization is required for reliable symbol detection. The maximum-likelihood sequence detector is the optimal equalization scheme; however its implementation complexity increases exponentially with the channel length and thus can be prohibitively high. In this paper, we compare the performance of two practically implementable suboptimal symbol detectors, including the partial response maximum-likelihood (PRML) detector and the partial response belief propagation (PRBP) detector, under frequency-selective fading channels. Both detectors employ a hybrid two-stage scheme, and allow a tradeoff between performance and complexity. The first stage is a partial response equalizer implemented as a linear filter which transforms the original channel impulse response to a target impulse response with reduced ISI. The residual ISI is then cancelled in the second stage using a more sophisticated nonlinear detector. In simulations, we consider a slow fading environment and use the ITU-R 3G channel models. From the numerical results, it is shown that in frequency-selective fading wireless channels, the PRBP detector provides superior performance over both the traditional minimum mean squared error linear equalizer and the PRML detector. Due to the effect of colored noise, the PRML detector in fading wireless channels is not as effective as it is in magnetic recording applications.
Sponsorship	IEEE Circuits Syst. Soc.
Starting Page	1716
Ending Page	1719
File Size	430858
Page Count	4
File Format	PDF
e-ISBN	9781479934324
DOI	10.1109/ISCAS.2014.6865485
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-06-01
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Detectors Fading Maximum likelihood estimation Wireless communication Complexity theory Colored noise Maximum likelihood detection frequency-selective fading Belief propagation algorithm partial response equalization maximum-likelihood sequence estimation
Content Type	Text
Resource Type	Article

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