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Performance Analysis of MU-MIMO with Very Large Antenna Arrays Over Nakagami-m Fading Channels



Multiuser MIMO (MU-MIMO), where the base stations (BSs) are equipped with multiple antennas and communicate with several co-channel users, has gained much attention and is now being introduced in several new generation wireless standards (e.g., LTE-Advanced, 802.16m). Conventional MIMO technology uses a relatively small number of antennas at the BS. The LTE standard, for example, allows for up to 8 antenna ports. By contrast, we are concerned with MIMO systems that use a very large number of antennas at the BS compared to systems being built today, i.e., a hundred or more antennas. Recently, MU-MIMO with very large antenna arrays at the BS is of particular interest since it i) significantly improves the data rate, and communication reliability [1, 2]; and ii) reduces the transmit power of an order of magnitude, or more [3]. Most of the previous studies assume that the channels are Rayleigh fading. However, it is better to model the channel as the Nakagami-m fading since Nakagami-m channels capture a variety of physical environments (including Rayleigh fading models). Furthermore, Nakagami-m model has been shown to fit better with empirical data. Therefore, it is necessary to investigate the performance of very large MU-MIMO under Nakagami-m fading channels.

Problem statement

In this project, we will study the performance of MU-MIMO with very large antenna arrays over Nakagami-m channels. We consider the uplink and assume that the BS uses maximum-ratio combining techniques to detect the transmit signals from the users. We use measures such as sum-rate, symbol error probability, outage probability, etc, to analyze the system performance and the effect of the fading parameter on the power efficiency, required number of antennas, etc.


The student needs a strong background in mathematics (especially analytics, algebra), probability theory, and good skills in Matlab programming.


[1] F. Rusek, D. Persson, B. K. Lau, E. G. Larsson, T. L. Marzetta, O. Edfors, and F. Tufvesson, Scaling up MIMO:Opportunities and challenges with very large arrays, IEEE Signal Process. Mag., to appear. [Online]. Available://arxiv.org/abs/1201.3210.
[2] T. L. Marzetta, Noncooperative cellular wireless with unlimited numbers of base station antennas, IEEE Trans. Wireless Commun., vol. 9, no. 11, pp. 3590-3600, Nov. 2010.
[3] H. Q. Ngo, E. G. Larsson, and T. L. Marzetta, Energy and spectral ef_ciency of very large multiuser MIMO systems, IEEE Trans. Commun., submitted. [Online]. Available: //arxiv.org/abs/1112.3810.

Page responsible: Danyo Danev
Last updated: 2014 09 22   16:58