We propose here a linear blind multiuser detector, referred to as the Capon receiver, for space-time coded CDMA (code division multiple access) systems. The proposed Capon receiver is designed to pass desired signals without distortion, meanwhile minimizing the overall interference signals, irrespective of their origins. It is shown that the Capon receiver achieves similar performance in terms ...

We study the performance of the minimum-noisevariance beamformer employing a single electromagnetic (EM) vector sensor that is capable of measuring the complete electric and magnetic fields induced by EM signals at one point. Two types of signals are considered: One carries a single message, and the other carries two independent messages simultaneously. The state of polarization of the interfer...

Absfrucf-A wireless network that provides multimedia services should control the quality of the transmission link for users, allocating resources according to the service type of each user, be it voice, video, image or data. This paper proposes a scheme to allocate the desired signal to interference noise ratio (SINR) for those users with multimedia services by exploiting power control and smar...

The concept of Cognitive Radio (CR) is meant to be utilised by both licensed and license-exempt users that coexist in a shared spectrum area whenever they need to avoid causing unaffordable interference to each other by following some rules. In fact, primary users should be protected by any licenseexempt transmission. To this end, power control is a pivotal mechanism to be used for interference...

A fundamental choice in femtocell deployments is the set of users which are allowed to access each femtocell. Closed access restricts the set to specifically registered users, while open access allows any mobile subscriber to use any femtocell. Which one is preferable depends strongly on the distance between the macrocell base station (MBS) and femtocell. The main results of the paper are lemma...

We investigate the efficiency of interference alignment for 2 × 2 × 2 interference networks formed by concatenation of two user interference channels under the assumption of imperfect channel state information. We show that, as a result of cumulative noise in zero forcing receivers, aligned interference neutralisation is not practical when perfect channel state information is not available. We ...

Abstract— The spectral efficiency of large CDMA systems using higher order modulation schemes is investigated. Therefore, the asymptotic analysis for single cell systems and random spreading codes is used to obtain the signal-to-interference-andnoise ratio (SINR) after the Matched Filter (MF) and Linear Minimum Mean-Squared-Error (LMMSE) receiver. Then the concepts of capacity and cut-off rate ...

We present a large-system performance analysis of blind and group-blind multiuser detection methods. In these methods, the receivers are estimated based on the received signal samples. In particular, we assume binary random spreading, and let the spreading gain , the number of users , and the number of received signal samples all go to infinity, while keeping the ratios and fixed. We characteri...

This paper presents an updated architecture for a code division multiple access (CDMA) wireless communication systems with directional antennas. Cochannel interference for the proposed CDMA architecture is considered and analyzed. An analytic expression for the proposed method is derived. The performance of the proposed architecture is evaluated by means of computer simulation. The result shows...