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In a closed-loop multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) system, the receiver estimates the channel and sends updates on the channel state back to the transmitter. The issue of deciding when to send updates is addressed in this paper and two metrics for making this decision are compared. One is obtained from the correlation matrix distance (CMD) which...
In this paper, we propose several power control schemes for MIMO systems using spatial multiplexing (SM) with a minimum mean square error (MMSE) receiver under slow fading, to improve the bit error rate (BER) performance, both for an individual link and within a cellular system. After comparing the performance of these proposed power control schemes, we find that a further scheme which effectively...
Most research on differential MIMO is based on space-time block codes, aiming to achieve maximum transmit diversity and thus make the transmission more robust by the aid of the special orthogonal or quasi-orthogonal code structures. However, a differential scheme based on a spatial multiplexing approach such as the Bell-Labs layered space time (BLAST) wireless architecture would be likely to provide...
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