Symbol error performance analysis of OFDM relaying system with subcarrier mapping scheme

Authors:
Shaohua Chen;Fang Liu;Xin Zhang;Cong Xiong;Dacheng Yang
Affiliations:
Wireless Theories and Technologies Lab, Beijing University of Posts and Telecommunications, Beijing, China;School of Nuclear Science and Engmeenng, North China Electric Power University, Beijing, China;Wireless Theories and Technologies Lab, Beijing University of Posts and Telecommunications, Beijing, China;ITP Lab, Georgia Institute of Technology;Wireless Theories and Technologies Lab, Beijing University of Posts and Telecommunications, Beijing, China
Venue:
IEEE Communications Letters
Year:
2010

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Abstract

This letter presents a study on statistical and symbol error performance analysis of the two-hop orthogonal frequency division multiplexing (OFDM) relay link with amplify-and-forward (AF) protocol and subcarrier mapping (SCM) scheme. Closed-form expressions for probability density function (PDF) and symbol error probability (SEP) of the signal-to-noise ratio (SNR) for the kth mapped subcarrier pair link (k-MSPL) are provided. Our asymptotic SEP analysis reveals that the traditional SCM which can maximize the capacity can not improve the average SEP for uncoded OFDM system, however the average SEP can be decreased significantly by dropping several worst links.