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This paper proposes a new codebook-based SDMA scheme, which employs a variable number of active beams, i.e., a dynamic multiplexing order, to target a good tradeoff between the multiplexing gain and the inter-user interference. The new transmit scheme consist of a modification of the conventional feedback information and the development of a novel scheduling algorithm, where the new scheduling algorithm...
Zhang recently derived upper and lower bounds on the achievable diversity of an NR timesNT i.i.d. Rayleigh fading multiple antenna system using transmit antenna selection, spatial multiplexing and a linear receiver structure. For the case of L = 2 transmitting (out of NT available) antennas the bounds are tight and therefore specify the maximal diversity order. For the general case with L les min(...
Using information about the channel at the transmitter can improve the performance of multiinput multioutput (MIMO) communication systems. When perfect channel state information (CSI) is available at the transmitter, data can be multiplexed and optimized over independent spatial channels. However, when the available channel information is imperfect or partial, crosstalk between the spatial channels...
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