Capacity gain from two-transmitter and two-receiver cooperation

Chris T.K. Ng, Nihar Jindal, Andrea J. Goldsmith, Urbashi Mitra

Research output: Contribution to journalArticlepeer-review

98 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)3822-3827
Number of pages6
JournalIEEE Transactions on Information Theory
Volume53
Issue number10
DOIs
StatePublished - Oct 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Information Systems
  • Computer Science Applications
  • Library and Information Sciences

Keywords

  • Capacity
  • Dirty-paper coding
  • Power and bandwidth allocation
  • Transmitter and receiver cooperation
  • Wireless ad hoc network
  • Wyner-Ziv compress-and-forward

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