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The impact of channel state estimation errors in a CDMA system employing adaptive modulation and coding in conjunction with multicodes is studied. The channel is modelled as a finite-state Markov chain and the performances using (1) a simple moving average (SMA) filter (2) a hidden Markov model (HMM) filter to estimate the channel state are compared. The results show that the HMM filter is more robust...
A statistical power adjustment scheme for systems employing adaptive modulation and coding as well as multicodes is proposed. The scheme adjusts the transmit power level, based on the statistics of the received signal-to-interference ratio, in order to achieve a target bit rate outage probability. It is shown that the required power adjustment can differ greatly depending on the channel parameter...
The performance of selection diversity over independent but not necessarily identically distributed Nakagami fading channels is studied. An exact closed-form expression for the probability density function of the selected channel signal-to-noise ratio is derived. Exact closed-form expressions for the corresponding cumulative distribution function, moment generating function and moments are also obtained...
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