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| Limited Feedback SDMA with Adaptive Multiplexing Order |
| Huang Yong-ming; Xu Dao-feng;Luo Yuan-qian; Yang Lu-xi |
| School of Information Science and Engineering, Southeast University, Nanjing 210096, China |
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Abstract In order to tackle the inter-user interference issue of the limited feedback SDMA which uses a fixed number of active beams to simultaneously transmit signal, this paper proposes a novel limited feedback SDMA capable of adaptively selecting the optimal number of simultaneous beams, i.e., the optimal multiplexing order. In particular, the base station uses the feedback information from users and the spatial correlation matrix at the transmitter to ML estimate the maximum supported sum throughput for different number of active beams, thus the multiplexing order with the optimal performance can be chosen in each implementation of SDMA. Simulation results demonstrate that the proposed SDMA considerably outperforms the conventional SDMA in terms of throughput, with a small additional feedback overhead.
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Received: 15 November 2007
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2009, Vol. 31 
