Performance Analysis of Multicarrier DS-CDMA with Antenna Array in a Fading Channel

Authors:
Wei Yang;Junshi Chen;Zhenhui Tan;Shixin Cheng
Affiliations:
State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing, China 100044 and National Mobile Communications Research Laboratory, Southeast University, Nanjing, C ...;State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing, China 100044;State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing, China 100044;National Mobile Communications Research Laboratory, Southeast University, Nanjing, China 210096
Venue:
Wireless Personal Communications: An International Journal
Year:
2010

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Abstract

In this paper, an antenna array based base station receiver structure for multicarrier direct sequence code-division-multiple-access (Multicarrier DS-CDMA) system with binary phase shift keying (BPSK) modulation is proposed. One of the main advantages of the receiver structure is that the spatial diversity is obtained by combining signals at different array elements. Based on the detailed analysis of multiple access interference (MAI) and additive white Gaussian noise (AWGN) characteristics, the uplink bit error rate (BER) performance of the proposed antenna array Multicarrier DS-CDMA is provided. With regard to spatial domain combining, the optimum spatial combining (OSC) and suboptimum spatial combination (SOSC) weights is derived while the suboptimum set of weights is simplified in the sense that only the knowledge of array vector of desired user alone is sufficient for the combining. Simulation results verify the analysis, and it is shown that MAI is mitigated and subsequently the system performance is improved significantly by incorporating antenna array at the base station.