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http://dx.doi.org/10.7840/KICS.2011.36C.7.443

Adaptive Dual-Hop Transmission Based On Hierarchical Modulation in UWB System  

Kim, Dae-Hwan (전자부품연구원 RFID.USN융합연구센터)
Song, Hyoung-Kyu (세종대학교 정보통신공학과 uT통신연구소)
Cho, We-Duke (아주대학교 전자공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.36, no.7C, 2011 , pp. 443-450 More about this Journal
Abstract
Recently, various transmission techniques for communication and broadcasting systems have been developed to meet the dramatically increasing requirement of consumers. Because UWB (Ultra-Wideband) is a wireless communication technique that supports high data rate with low power, it can satisfy the requirement and can be applied to various wireless communication services. The multi-band orthogonal frequency division multiplexing (MB-OFDM) system, one of UWB system, is the wireless communication system that satisfies the transmission characteristic for UWB and so it can be used for various wireless communication services. In this paper, we propose a scheme that uses hierarchical modulation which is applied in digital video broadcasting system at the source and adaptive modulation based on the channel quality at the relays. The simulation results have shown that the proposed scheme has both the advantages of the increased throughput by 33% and similar BER performance to conventional scheme.
Keywords
cooperation; STBC; hierarchical modulation;
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