Asymptotically Optimal Power Control Policies for MMSE Multiuser Detector |
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Authors: | Zvi Rosberg |
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Affiliation: | (1) Department of Communication Systems Engineering, Ben Gurion University, Beer-Sheva, 84105, Israel |
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Abstract: | Asymptotically optimal uplink transmission power control policies are derived for synchronous and asynchronous CDMA time varying
fading channels with multiple user classes, random spreading sequences and MMSE multiuser detector. One optimal policy minimizes
the outage probability subject to maximum average power budget and maximum transmission power constraints. Another minimizes
the average power budget subject to maximum outage probability and maximum transmission power constraints. If the channel
states are available, we show that both optimal policies are channel inversion threshold cut-off policies and express them
explicitly. When channel states are estimated, we show how to transform the optimal policies into estimator-based policies
while controlling the degradation of their performance measures . Finally, we compare between the performance of the optimal
policies and other policies in an environment with Lognormal and Rayleigh fading. |
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Keywords: | power control outage probability CDMA random spreading sequence fading channels MMSE multiuser detector |
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