Spectral efficiency of CDMA with random spreading
IEEE Transactions on Information Theory
Linear multiuser receivers: effective interference, effective bandwidth and user capacity
IEEE Transactions on Information Theory
Capacity and mutual information of wideband multipath fading channels
IEEE Transactions on Information Theory
The impact of frequency-flat fading on the spectral efficiency of CDMA
IEEE Transactions on Information Theory
Asymptotic Performance of MMSE Receivers for Large Systems Using Random Matrix Theory
IEEE Transactions on Information Theory
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Based on free probability theory, a new scheme for frequency band sensing of spreading communication system is proposed. Unlike previous studies in the field, the new scheme does not require the knowledge of the spreading sequences of users and is related to the asymptotic free behavior of random matrices. Simulation result shows that the convergence characteristic holds true even for a small number of observations, which makes the new scheme well suited for realistic time-varing scenario. The sensing performance of new scheme is also much better than that of classical energy detection scheme.