On Sum Rate and Power Consumption of Multi-User Distributed Antenna System with Circular Antenna Layout

Department of Electronic Engineering, Tsinghua University, Peping, Beijing, China
EURASIP Journal on Wireless Communications and Networking (Impact Factor: 0.72). 01/2007; 2007(1). DOI: 10.1155/2007/89780
Source: DBLP


We investigate the uplink of a power-controlled multi-user distributed antenna system (DAS) with antennas deployed on a circle. Applying results from random matrix theory, we prove that for such a DAS, the per-user sum rate and the total transmit power both converge as user number and antenna number go to infinity with a constant ratio. The relationship between the asymptotic per-user sum rate and the asymptotic total transmit power is revealed for all possible values of the radius of the circle on which antennas are placed. We then use this rate-power relationship to find the optimal radius. With this optimal radius, the circular layout DAS (CL-DAS) is proved to offer a significant gain compared with a traditional colocated antenna system (CAS). Simulation results are provided, which demonstrate the validity of our analysis.

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    • "In contrast, the study of the DAS uplink is limited. In [4], Gan et al. considered a DAS over a finite disc and assumed a circular layout for the system receive antennas. The capacity per user is determined by applying standard results of random matrix theory (RMT) for Wishard matrices (see e.g. "
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    • "A detailed overview can be found in [6]. Multiuser DAS in uplink were studied in [8] and [9] using random matrix theory [10] and considering a given finite area. Due to strong underlying approximations, in both cases, the DAS sum capacity is approximated by the limiting capacity of a multiple input multiple output (MIMO) cellular system with full base stations cooperation, as pointed out in [11]. "
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    • "Basically, the uplink of the system can be regarded as a KM by NL MIMO link. The received signal vector can be expressed as [5] "
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    ABSTRACT: In this paper, the uplink of a multi-user distributed antenna system (DAS) with antenna elements deployed on a circle is investigated. We address the problem of calculating the sum-rate capacity with per-user power constraints. Based on system scale-up, we derive a good approximation of the sum-rate capacity by adopting random matrix theory. We also propose an iterative method to calculate the unknown parameters in the approximation. The approximation is illustrated to be quite accurate and the iterative method is verified to be quite efficient by Monte Carlo simulations.
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