Multi-Carrier and Spread Spectrum Systems
Multi-Carrier and Spread Spectrum Systems
Wireless Information Networks (Wiley Series in Telecommunications and Signal Processing)
Wireless Information Networks (Wiley Series in Telecommunications and Signal Processing)
BER computation of an MC-CDMA system with carrier frequency offset
ICASSP '99 Proceedings of the Acoustics, Speech, and Signal Processing, 1999. on 1999 IEEE International Conference - Volume 05
A frame synchronization and frequency offset estimation algorithm for OFDM system and its analysis
EURASIP Journal on Wireless Communications and Networking
Sensitivity of multicarrier two-dimensional spreading schemes to synchronization errors
EURASIP Journal on Wireless Communications and Networking
BER of OFDM systems impaired by carrier frequency offset in multipath fading channels
IEEE Transactions on Wireless Communications
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Multicarrier Code Division Multiple Access (MC-CDMA) is an attractive technique for high speed wireless data transmission in view of its advantages over orthogonal frequency division multiplexing. In this paper, we analyze the performance of fully loaded downlink MC-CDMA systems with minimum mean square error (MMSE) equalizer in the presence of residual frequency offset (RFO) in multipath Rayleigh fading channels. We first show that as the SNR is increased beyond a value, referred as threshold SNR, the performance degrades. We then analyze the cause for this behavior and propose a remedy to prevent the degradation by regularizing the coefficient(s) of the equalizer, and use the regularized equalizer for SNRs beyond the threshold value. We suggest two methods for estimating this SNR, one gives close to the true value but requires the knowledge of RFO and the channel state information (CSI), while the other gives an approximate value but requires only CSI. We show that the regularization based on the approximate value also prevents the degradation, but the performance at higher SNRs is slightly poorer compared to that with the better estimate. Numerical and simulation results are provided to support the analysis.