White Papers

Capacity Analysis on Downlink MIMO OFDMA Systems

Overview Motivated by the increasing popularity of OFDMA and MIMO, this paper studies the capacity of MIMO enabled OFDMA system under a generic multiuser multicarrier framework. This paper shows that in terms of total system capacity, OFDMA is the optimal downlink scheme for independent decoding receivers. To achieve the capacity bound however, one must solve a multiuser subcarrier allocation and the optimal power allocation jointly. The computational cost for finding the optimal solution is exponential with respect to the number subcarriers and polynomial with respect to the number of users. To alleviate the complexity, we propose two suboptimal subcarrier allocation criteria, namely, the Product-criterion and the Sum-criterion, for OFDMA MIMO systems.

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Publisher: University of Washington
File Format: PDF, requires Acrobat Rdr 5
Date Published: Nov 2, 2004
Format: White Papers
Topics: Modems

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