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On the Asymptotic Performance of Multiple Antenna Channels with Fast Channel Feedback

By Ahmad Khoshnevis and Ashutosh SabharwalAhmad Khoshnevis and Ashutosh Sabharwal


Journal PaperIn this paper, we analyze the asymptotic performance of multiple antenna channels where the transmitter has either perfect or finite bit channel state information. Using the diversitymultiplexing tradeoff to characterize the system performance, we demonstrate that channel feedback can fundamentally change the system behavior. Even one-bit of information can increase the diversity order of the system compared to the system with no transmitter information. In addition, as the amount of channel information at the transmitter increases, the diversity order for each multiplexing gain increases and goes to infinity for perfect transmitter information. The major reason for diversity order gain is a â location-dependentâ temporal power control, which adapts the power control strategy based on the average channel conditions of the channel

Topics: MIMO, perfect feedback, quantized feedback, diversity-multiplexing tradeoff, power control, MIMO, perfect feedback, quantized feedback, diversity-multiplexing tradeoff, power control
Year: 2005
DOI identifier: 10.1109/T-WC.2008.070433
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