The jointly optimum noncoherent receiver is obtained for multiuser communications in a frequency non-selective Rayleigh fading channel with NT transmit antennas per user and NR receive antennas. Based on a general analysis of quadratic receivers in zero-mean complex Gaussian vectors, we derive asymptotically (for high SNR) tight expressions for the pair-wise error probabilities for some cases o...

For lack of empty radio bands, ultra-wideband (UWB) radio that allows the reuse of already occupied frequency bands is the only solution to accommodate new wireless data communication services. The recovery of the very short and extremely wideband wavelets used in UWB radio is not feasible. This is why noncoherent demodulation techniques have to be used. Introducing a general model for the nonc...

In this paper, we propose a new transmission technique based on correlated tones associated with noncoherent detection over Rayleigh fading channels. It is shown that the use of multidi-mensional signal alphabets allows to compensate for the performance degradation due to the high correlation between the tones. In this way, the typically low spectral eeciency of noncoherent transmission can be ...

COMMUNICATION OVER THE NONCOHERENT CHANNEL

An analytical evaluation of the performance in terms of detection probability and mean detection time of a noncoherent detector at the base station is presented for a wideband CDMA system, where the mobile terminal transmits a pilot signal in the form of bursts of modulated chips, which are transmitted periodically and separated by long silent intervals. The performance analysis is carried out ...

The capacity of a random-phase additive white Gaussian noise (AWGN) channel, referred to as noncoherent channel, is investigated in the case of a transmission of N information symbols. The non-Gaussianity of the capacity-achieving distribution is shown and a lower bound on the channel capacity is derived. For increasing values of the number of transmitted symbols N , the capacity of a noncohere...

Slot combining is a method to achieve fast code acquisition in inter-cell asynchronous DS/SS systems by employing multiple observations. The optimal slot combining is difficult to implement, since it requires information on channel and frequency offset. Two practical combining schemes, a noncoherent combining and a coherent combining, are found to be special cases of the optimal combining. In t...

Noncoherent multiuser detection for nonlinear modulation was recently studied and the idea of phase-independent noncoherent decorrelation was introduced and three post-decorrelative detectors were obtained and analyzed. However, their implementation requires the knowledge of the signature waveforms of all the users, which may be available only for centralized implementation. In this paper, we o...