Abstract
In this paper bit error rate (BER) performance is analyzed for multiple input-multiple output (MIMO) communications systems using antenna selection in the transmitter, maximal ratio combining (MRC) and linear de-correlating detector (LDD) in the receiver in wide band code division multiple access (WCDMA) downlink channels with correlated Nakagami fading. The MRC maximizes signal to noise ratio of the received signal, then the LDD cancels out multiple access interference (MAI). Theoretical results are validated using computer simulations. Moreover, a pilot based estimation method is proposed to jointly estimate the channel gains and the rows of the LDD operator. Simulation results show that using this proposed method, diversity order is maintained in the receiver. Furthermore, our analysis shows the spectral efficiency degradation due to the pilot based strategy is negligible.
Highlights
Wide band code division multiple accesses (WCDMA) has been proposed to satisfy ever-increasing demands for higher data rates, as well as to allow more users to simultaneously access the network [1]
In this paper bit error rate (BER) performance is analyzed for multiple input-multiple output (MIMO) communications systems using antenna selection in the transmitter, maximal ratio combining (MRC) and linear de-correlating detector (LDD) in the receiver in wide band code division multiple access (WCDMA) downlink channels with correlated Nakagami fading
The effect of the proposed method for joint estimation of channel and the LDD operator is studied on the BER performance of Transmitter antenna selection (TAS)/MRC plus LDD system
Summary
Wide band code division multiple accesses (WCDMA) has been proposed to satisfy ever-increasing demands for higher data rates, as well as to allow more users to simultaneously access the network [1]. Blind multiuser detectors are proposed for multiple access interference (MAI) cancellation [3], but use of these detectors increases computational complexity of mobile stations (MSs). Another approach for MAI cancellation in downlink multiuser scenario is the precoding method at the base station (BS) [4], but it requires error free links between each MS and the BS, which is not the case in practical scenarios. We propose a low complexity pilot based channel estimation method for the joint estimation of the channel gains and the rows of the LDD operator in order to cancel out the MAI.
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