Title :
Scalable Feedback Protocol Asymptotically Achieving Broadcast Channel Sum-capacity
Author :
Hwang, Chan-Soo ; Cioffi, John M.
Author_Institution :
Dept. of Electr. Eng., Stanford Univ., Stanford, CA
fDate :
Oct. 29 2006-Nov. 1 2006
Abstract :
Distributed feedback-protocols are developed for multi-user diversity to (a) keep the feedback amount fixed regardless of the number of users (denoted as U); (b) maintain identical protocols; (c) asymptotically achieve sum-capacity; and (d) minimize power consumption. With proposed methods, the users with signal-to-noise ratio (SNR) larger than a threshold T k send feedback messages at slot k. Tk is designed for the probability of feedback transmission at any slot to be p. With proper p, the probability of feedback from the user with the largest SNR is prescribed probability s regardless of U. Then, all four objectives are achieved with the proposed feedback methods.
Keywords :
broadcast channels; diversity reception; feedback; multiuser channels; probability; protocols; broadcast channel sum-capacity; distributed feedback protocol; multiuser diversity; power consumption minimisation; probability; Access protocols; Broadcasting; Energy consumption; Fading; Feedback; Multiuser detection; Probability; Quantization; Random variables; Signal to noise ratio;
Conference_Titel :
Signals, Systems and Computers, 2006. ACSSC '06. Fortieth Asilomar Conference on
Conference_Location :
Pacific Grove, CA
Print_ISBN :
1-4244-0784-2
Electronic_ISBN :
1058-6393
DOI :
10.1109/ACSSC.2006.356613