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http://dx.doi.org/10.5573/IEIESPC.2014.3.4.181

Performance Analysis of Uplink Cognitive Radio Transmission based on Overloaded MC-DS-CDMA  

Sundararajan, Mohandass (Department of Electronics and Communication Engineering, PSG College of Technology)
Govindaswamy, Umamaheswari (Department of Electronics and Communication Engineering, PSG College of Technology)
Publication Information
IEIE Transactions on Smart Processing and Computing / v.3, no.4, 2014 , pp. 181-190 More about this Journal
Abstract
This paper reports a cognitive radio network architecture based on overloaded multicarrier direct sequence code division multiple access (O-MC-DS-CDMA). The O-MC-DSCDMA technique combines CDMA with a multicarrier modulation technique to overcome the channel fading effects. In this technique, secondary users are enabled to share the available bandwidth with the existing primary users. Two sets of orthogonal Gold codes are used to support the primary and secondary users simultaneously. The orthogonality between the spreading codes is lost due to the non-zero cross correlation between the codes and the timing synchronization error in the uplink transmission, which causes interference between primary and secondary users. This paper proposes two modified hybrid parallel/successive interference cancellation techniques for primary and secondary user base station receivers with multiple antennas to suppress the interference among users. Interference among the same group of users is cancelled by parallel interference cancellation and the interference among groups is cancelled using successive interference cancellation. The simulation results confirmed that the proposed modified interference cancellation techniques show better BER performance over conventional interference cancellation techniques.
Keywords
Cognitive radio; Overloaded MC-DS-CDMA; Orthogonal gold codes; Hybrid interference cancellation;
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