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In practical applications, mismatches between assumed and actual array responses lead to serious degradation of SINR at the array output. In this paper, we propose robust CMA based on the quadratic constraint, which improves the output performance. The quadratic constraint on the weight can provide excellent robustness to signal steering vector mismatches and to random perturbations in sensor parameters...
In order to suppress the multi-path interference (MPI) in the DS CDMA system, a new RAKE receiver based on parallel interference elimination is first proposed in this paper: data symbol tentative decision is obtained by linear decision; the multi-path interference are evaluated by tentative decision and known user information. Then the performance over Rayleigh fading channel are analyzed and compared...
In this paper, a new semi-blind multiuser detection based on a hybrid of Chebyshev approximation (CA) and subspace estimation is proposed for multicarrier code division multiple access (MC-CDMA) uplink. It is shown that the detector can be expressed as an anchored signal in the signal subspace and the coefficients can be estimated by CA algorithm. The spreading sequences of all known users are used...
In this paper, a new semi-blind multiuser detection algorithm based on subspace constrained least mean-squared (LMS) is proposed for multicarrier code division multiple access (MC-CDMA) uplink system. This proposed detector makes use of the spreading sequences of all known users to impose multiple constraints on the minimum output energy (MOE) multiuser detection so that the interference within the...
Adaptive beamforming is known to have resolution and interference rejection capability when the array steering vector is precisely known. However, the performance of adaptive beamforming techniques may degrade severely in the presence of mismatches between the assumed array response and the true array response. In this paper, we propose robust adaptive beamforming algorithm based on explicit modeling...
In this paper, based on the theory of multicarrier (MC) signaling technique and the RAKE receiver, a multicarrier DS-CDMA RAKE system is proposed. We evaluate the system performance over Rayleigh fading channel with multiple access interference (MAI) and narrow-band interference (NBI) present, and compare the results with those of both a single carrier RAKE system and a multicarrier DS-CDMA system...
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