A new technique for multi-cell joint channel estimation in time division code division multiple access based on reduced rank singular value decomposition

Abstract

A new technique for multi-cell joint channel estimation (MCJCE) in time division code division multiple access based on singular value decomposition (SVD) reduced rank technique is proposed in this paper. MCJCE is one of the effective solutions to improve the mobile system performance throughout mitigate the inter-cell interference form the neighboring cells. The increasing complexity of multi-cell system model due to the additional processing of the interferer users will be solved by using SVD reduced rank technique, where a limited number of parameter that really need it to describe the channel matrix will be estimated. Two models of multi-cell approaches are discussed, the first one depended on reconstruct the convolutional midamble matrix of inactive users in serving cell by the strongest interferer users from the neighboring cells. The second one will be more inclusive to user traffic scenarios in mobile systems and will be expanding to contain all detected users. The simulation results prove the validity of the proposed reduced rank technique for precision channel estimation (6.4 and 5 dB) and (9 and 7 dB) for case 1 and 2 respectively; BER performance improvements over the conventional estimators.

Low-complexity WLMMSE channel estimator for MB-OFDM UWB systems

“…Many studies (see, e.g., [24,[27][28][29][30][31][32][33][34][35][36][37][38]) have shown that significant complexity reduction can be achieved by rank reduction techniques. Among these techniques, the eigenvalue decomposition (EVD) and its related singular value decomposition (SVD) techniques have had growing interest.…”

“…The simulation results of the proposed scheme for CDMA interference suppression show a performance significantly better than existing schemes and close to the optimal fullrank MMSE. Moreover, Marzook et al have proposed a novel channel estimation technique based on SVD technique for time division code division multiple access (TD-SCDMA) [30]. The results have shown that the proposed technique improves the performance of the TD-SCDMA system with low-rank processing and low computation complexity.…”