A Threshold-Based Channel State Feedback Algorithm for Modern Cellular Systems
IEEE Transactions on Wireless Communications
Achieving Multi-user Diversity Gain using User-Identity Feedback
IEEE Transactions on Wireless Communications
Capacity of fading channels with channel side information
IEEE Transactions on Information Theory
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User-identity feedback was proposed to achieve multi-user diversity while minimizing feedback load. This letter mathematically shows that the transmit-power consumption of the user-identity feedback converges to zero as the number of users increases. Numerical results in a Rayleigh fading channel show that the transmit-power saving is substantial even with small number of users.