Linear multiuser receivers: effective interference, effective bandwidth and user capacity
IEEE Transactions on Information Theory
Large system performance of linear multiuser receivers in multipath fading channels
IEEE Transactions on Information Theory
MMSE analysis of certain large isometric random precoded systems
IEEE Transactions on Information Theory
Simple polynomial detectors for CDMA downlink transmissions on frequency-selective channels
IEEE Transactions on Information Theory
Asymptotic analysis of optimum and suboptimum CDMA downlink MMSE receivers
IEEE Transactions on Information Theory
On the system level prediction of joint time frequency spreading systems with carrier phase noise
IEEE Transactions on Communications
BER degradation of MC-CDMA at high SNR with MMSE equalization and residual frequency offset
EURASIP Journal on Wireless Communications and Networking
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This paper presents the impact of synchronization errors on the performance of a downlink multicarrier two-dimensional spreading OFDM-CDMA system. This impact is measured by the degradation of the signal to interference and noise ratio (SINR) obtained after despreading and equalization. The contribution of this paper is twofold. First, we use some properties of random matrix and free probability theories to derive a new expression of the SINR. This expression is then independent of the actual value of the spreading codes while still accounting for the orthogonality between codes. This model is validated by means of Monte Carlo simulations. Secondly, the model is exploited to derive the SINR degradation of OFDM-CDMA systems due to synchronization errors which include a timing error, a carrier frequency offset, and a sampling frequency offset. It is also exploited to compare the sensitivities of MC-CDMA and MC-DS-CDMA systems to these errors in a frequency selective channel. This work is carried out for zero-forcing and minimum mean square error equalizers.