Fractionally Spaced Equalization for Asynchronous Broadband Analog Network Coding

Zhaoxi FANG  Feng LIANG  Shaozhong ZHANG  Xiaolin ZHOU  

IEICE TRANSACTIONS on Communications   Vol.E95-B   No.11   pp.3617-3620
Publication Date: 2012/11/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.3617
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
analog network coding,  asynchronous,  bi-directional transmission,  fractionally spaced equalizer,  

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Timing asynchronism strongly degrades the performance of analog network coded (ANC) bi-directional transmission. This letter investigates receiver design for asynchronous broadband bi-directional transmission over frequency selective fading channels. Based on time domain oversampling, we propose fractionally spaced frequency domain minimum mean square error (MMSE) equalizers for bi-directional ANC based on orthogonal frequency division multiplexing (OFDM) and cyclic prefixed single carrier (CP-SC) radio access. Simulation results show that the proposed fractionally spaced equalizer (FSE) can eliminate the negative effect of timing misalignment in bi-directional transmissions.