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Performance Enhancement of an OFDMA/CDM-based Cellular System in a Multi-Cell Environment  

Kim, Duk-Kyung (인하대학교 정보통신공학과)
Ryu, Je-Hun (인하대학교 정보통신공학과 무선통신연구실)
Jeong, Bu-Seop (인하대학교 정보통신공학과 무선통신연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.7A, 2005 , pp. 587-596 More about this Journal
Abstract
In this paper, we propose an OFDMA/CDM-based cellular system, which accommodates multiple users in frequency-domain and multiplexes user data with frequency-domain spreading. The proposed system utilizes random codes to discriminate cells and adopts the pre-equalization to enhance the performance. For cellular applications, a number of pre-equalization techniques are compared and an efficient power allocation scheme is suggested with a transmit power constraint. Especially, the validity of OFDMA/CDM based cellular system is investigated, by comparing the performance for varying the number of multiplexed data symbols at different locations. Finally the pre/post-equalization is proposed to reduce the performance degradation caused by time delay.
Keywords
OFDMA/CDM; Cellula; Equalization;
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