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Article overview
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A Low-complexity Channel Shortening Receiver with Diversity Support for Evolved 2G Device | | Sha Hu
; Harald Kroll
; Qiuting Huang
; Fredrik Rusek
; | | Date: |
24 Nov 2015 | | Abstract: | The second generation (2G) cellular networks are the current workhorse for
machine-to-machine (M2M) communications. Diversity in 2G devices can be present
both in form of multiple receive branches and blind repetitions. In presence of
diversity, intersymbol interference (ISI) equalization and co-channel
interference (CCI) suppression are usually very complex. In this paper, we
consider the improvements for 2G devices with receive diversity. We derive a
low-complexity receiver based on a channel shortening filter, which allows to
sum up all diversity branches to a single stream after filtering while keeping
the full diversity gain. The summed up stream is subsequently processed by a
single stream Max-log-MAP (MLM) equalizer. The channel shortening filter is
designed to maximize the mutual information lower bound (MILB) with the
Ungerboeck detection model. Its filter coefficients can be obtained mainly by
means of discrete-Fourier transforms (DFTs). Compared with the state-of-art
homomorphic (HOM) filtering based channel shortener which cooperates with a
delayed-decision feedback MLM (DDF-MLM) equalizer, the proposed MILB channel
shortener has superior performance. Moreover, the equalization complexity, in
terms of real-valued multiplications, is decreased by a factor that equals the
number of diversity branches. | | Source: | arXiv, 1511.7702 | | Services: | Forum | Review | PDF | Favorites | |
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