Title :
Capacity Gain From Two-Transmitter and Two-Receiver Cooperation
Author :
Ng, Chris T K ; Jindal, Nihar ; Goldsmith, Andrea J. ; Mitra, Urbashi
Author_Institution :
Stanford Univ., Stanford
Abstract :
Capacity improvement from transmitter and receiver cooperation is investigated in a two-transmitter, two-receiver network with phase fading and full channel state information (CSI) available at all terminals. The transmitters cooperate by first exchanging messages over an orthogonal transmitter cooperation channel, then encoding jointly with dirty-paper coding. The receivers cooperate by using Wyner-Ziv compress-and-forward over an analogous orthogonal receiver cooperation channel. To account for the cost of cooperation, the allocation of network power and bandwidth among the data and cooperation channels is studied. It is shown that transmitter cooperation outperforms receiver cooperation and improves capacity over noncooperative transmission under most operating conditions when the cooperation channel is strong. However, a weak cooperation channel limits the transmitter cooperation rate; in this case, receiver cooperation is more advantageous. Transmitter-and-receiver cooperation offers sizable additional capacity gain over transmitter-only cooperation at low signal-to-noise ratio (SNR), whereas at high SNR transmitter cooperation alone captures most of the cooperative capacity improvement.
Keywords :
ad hoc networks; channel capacity; mobile radio; receivers; transmitters; bandwidth allocation; capacity gain; channel state information; dirty-paper coding; power allocation; signal-to-noise ratio; two-receiver cooperation; two-transmitter cooperation; wireless ad hoc network; Bandwidth; Channel allocation; Channel capacity; Channel state information; Costs; Fading; Information theory; Mobile ad hoc networks; Signal to noise ratio; Transmitters; Capacity; Wyner–Ziv compress-and-forward; dirty- paper coding; power and bandwidth allocation; transmitter and receiver cooperation; wireless ad hoc network;
Journal_Title :
Information Theory, IEEE Transactions on
DOI :
10.1109/TIT.2007.904987