Performance and Analysis of Pre-Filtering Techniques for MISO Downlink TDD MC-CDMA Systems.
ABSTRACT In this paper we consider and compare several strategies that can be employed to constrain the transmit power at base station (BS) and compare the performance of the different space-frequency pre-filtering techniques that have been proposed recently for DL MC-CDMA systems. We consider the use of antenna arrays at the base station and a single antenna at the mobile terminal (MT). These schemes format the transmitted signals to eliminate the effects of multiple access interference (MAI) and channel distortions at the mobile terminals, while maintaining low MT complexity. The performance of the different pre-filtering schemes is evaluated, considering both uncoded data and channel turbo coding based on UMTS specifications
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Conference Proceeding: On the capacity of multi-antenna Gaussian channels[show abstract] [hide abstract]
ABSTRACT: We investigate the use of multi-antennas at both ends of a point-to-point communication system over the additive Gaussian channel. We consider a system with t transmit antennas and r receive antennas in which the received vector v∈C<sup>τ</sup> depends on the transmitted vector u∈C<sup>τ</sup> via: v=Hu+w where H∈C <sup>r×t</sup> is the channel transfer matrix and w is zero-mean complex circular symmetric Gaussian noise. We assume that E[ww]=σ <sup>2</sup>I<sub>r</sub>. The transmitter is constrained in its total power, i.e., E[uu]⩽E<sub>s</sub>. We assume that the channel matrix H is known at both ends of the communication system, and that the waveform channel is flat over the bandwidth of interestInformation Theory, 2001. Proceedings. 2001 IEEE International Symposium on; 02/2001
Conference Proceeding: MMSE pre-filtering techniques for TDD MC-CDMA downlink transmissions[show abstract] [hide abstract]
ABSTRACT: We discuss signal pre-filtering in the downlink of a multi-carrier code-division-multiple-access (MC-CDMA) network operating in a time-division-duplex (TDD) mode. The base station (BS) is equipped with multiple antennas and channel state information (CSI) is available at the transmit side due to the channel reciprocity between uplink and downlink transmissions. The pre-filtering coefficients are designed so as to minimize the sum of mean square errors at all mobile terminals (MTs). The resulting scheme mitigates the detrimental effects of multiple access interference (MAI) and multipath propagation, thereby allowing the use of simple and power efficient single-user detection (SUD) techniques at the MTs. Simulation results are given to highlight the effectiveness of the proposed method with respect to other existing pre-filtering schemes.Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st; 01/2005