Performance Analysis of MT-CDMA System with Antenna Array in a Multipath Fading Channel

Authors:
Wei Yang;Junying Liu;Junshi Chen;Zhenhui Tan;Shixin Cheng
Affiliations:
Modern Telecommunication Institute, Beijing Jiaotong University, Beijing, China 100044 and National Mobile Communications Research Laboratory, Southeast University, Nanjing, China 210096;Modern Telecommunication Institute, Beijing Jiaotong University, Beijing, China 100044;Modern Telecommunication Institute, Beijing Jiaotong University, Beijing, China 100044;Modern Telecommunication Institute, Beijing Jiaotong University, Beijing, China 100044;National Mobile Communications Research Laboratory, Southeast University, Nanjing, China 210096
Venue:
Wireless Personal Communications: An International Journal
Year:
2007

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Abstract

In this paper, we propose a multitone code-division multiple-access (MT-CDMA) system employing antenna array at base station with quaternary phase shift keying modulation (QPSK) modulation. Based on the detailed analysis of interference characteristics the BER performance of the proposed MT-CDMA system is provided. With regard to spatial domain combining, the optimum and suboptimum combining weight is derived while the suboptimum set of weights is simplified on sense of that only the knowledge of array vector of desired user alone is sufficient for the optimum combining. Simulation results verify the analysis and show that better performance is achieved for the proposed antenna array system than single antenna MT-CDMA approach.