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This paper presents noise suppression linearly constrained least square constant modulus algorithm (LSCMA) for blind suppression of multiuser interferences cancellation in CDMA system. The conventional least square constant modulus algorithm (LSCMA) is difficult to converge to the desired user in the system that has several constant modulus signals. To overcome this shortage, a linearly constrained...
Nx SC-FDMA has been accepted as one of the main multiple access schemes for LTE-Advanced, which has been attracted much attention for supporting extended bandwidth. The classical transmit antenna diversity technique as Space-Frequency Block Coding (SFBC) will destroy the order and structure of the original symbols and thus enhance the peak-to-average power ratio (PAPR). To solve this problem, a modified...
In the multicarrier code division multiple access (MC-CDMA) uplink, the base station receiver has the knowledge of the spreading sequences of all the users within the cell, but not that of the users from other cells. In this paper, we present a novel semi-blind adaptive MMSE multi-user detector based on subspace tracking for MC-CDMA systems in such scenarios. We develop an modified MMSE detector which...
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 adaptive multiuser detection based on a subspace constrained Chebyshev approximation (CA) is proposed for multicarrier code division multiple access (MC-CDMA) uplink system. This proposed detector fully utilizes all known information to suppress the interferers within the cell, while mitigating the inter-cell interferers based on the minimum output energy (MOE) principle...
In this paper, a new subspace semi-blind adaptive multiuser detection based on a hybrid of Kalman filter and subspace estimation is proposed for MC-CDMA uplink. It is shown that the detector can be expressed as an anchored signal in the signal subspace and coefficients can be estimated by the Kalman filter. The spreading sequences of all known users are exploited to develop a new efficient semi-blind...
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...
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