Comparison of the performance of the linear beam forming techniques applied to the downlink of multi-user MIMO system


Abstract in English

Multi user multiple-input multiple-output (MIMO) systems provide high capacity with the benefits of space division multiple access. The channel state information at the base station (BS) or access point (AP) is very important since it allows joint processing of all users’ signals which results in a significant performance improvement and increased data rates. If the channel state information is available at the BS/AP, it can be used to efficiently eliminate or suppress multi-user interference (MUI) by beamforming or by using ”dirty-paper” codes. The precoding also allows us to perform most of the complex processing at the BS/AP which results in a simplification of users’ terminals. Linear precoding techniques have an advantage in terms of computational complexity. Non-linear techniques have a higher computational complexity and require some signaling overhead but can provide a better performance than linear techniques. In this research we compare the performance of several linear techniques through simulation using a program MATLAB (R2014a) for multi-user MIMO system. The Sum Rate and the BER resulting from the use of linear pre-coding techniques corporation to SNR [dB] and the number of base station antennas (NBS) will be analyzed and compared. In comparison between the multi-user MIMO Beamforming Linear techniques, we found that the single-value analysis (SVD) technology performs better than the other linear techniques in terms of achieving higher sum-rate and the bit error rate (BER) is relatively less.

References used

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