Sub-Carrier Coupling for Two Hop OFDM-AF Relaying Systems

doi:10.13190/jbupt.200801.135.070

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2008, Vol. 31 ›› Issue (1): 135-139.doi: 10.13190/jbupt.200801.135.070

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Sub-Carrier Coupling for Two Hop OFDM-AF Relaying Systems

ZHOU Ming-yu1,2, LI Li-hua1,2, ZHANG Ping1,2, WANG Hai-feng3, TAO Xiao-feng1,2

(1. Key Laboratory of Universal Wireless Communications (Beijing University of Posts and Telecommunications), Ministry of Education, Beijing 100876, China; 2. Beijing University of Posts and Telecommunications Wireless Technology Innovation Institute, Beijing 100876, China; 3. Technology Platform, Nokia, Shanghai 200002, China)

Received:2007-06-08 Revised:1900-01-01 Online:2008-02-28 Published:2008-02-28
Contact: ZHOU Ming-yu

Abstract

Abstract:

An amplify-and-forward (AF) based two-hop orthogonal frequency division multiplexing (OFDM) relaying system was analyzed. Since channel fading of the first hop and second hop is independent, system performance is limited if the signal is transmitted on the same sub-carrier in both hops. In order to solve the problem, a sub-carrier coupling method was proposed. A Hungarian algorithm was adopted to provide the optimal coupling scheme, and furthermore, sub-carrier coupling scheme based on sub-bands was presented. Simulations indicate that sub-carrier coupling can bring about 5 dB gain to the system. Though the gain of sub-carrier coupling scheme based on sub-bands only has a little loss, it can reduce signaling overhead greatly.

Key words: amplify-and-forward, orthogonal frequency division multiplexing, Hungarian algorithm

CLC Number:

TN911.2

ZHOU Ming-yu1,2, LI Li-hua1,2, ZHANG Ping1,2, WANG Hai-feng3, TAO Xiao-feng1,2
. Sub-Carrier Coupling for Two Hop OFDM-AF Relaying Systems[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2008, 31(1): 135-139.

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Sub-Carrier Coupling for Two Hop OFDM-AF Relaying Systems

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