Tuesday, February 20, 2007

Cooperative Communication in Wireless Networks

Cooperative Communication in Wireless Networks, Aria Nosratinia, Todd E. Hunter, Ahmadreza Hedayat, IEEE Communications Magazine, October 2004. Authors with UT Dallas, and Nortel Networks.

The paper is a survey of the field on cooperative networks. Surprisingly enough, it is a short survey, meaning the field is still very new. It has only 11 references. This survey cites the origin of cooperative network in the paper of Cover and El-Gamal (capacity theorems for the relay channel, IEEE Trans. Info Theory, 1979).

The survey categorizes four different types of cooperation: detectand forward; amplify and forward; decode and forward; coded cooperation.
  • The first one pairs nodes in a pair, and each partner's node attempts to detect the partner's bits and then retransmits the detected bits.
  • Amplify and forward is more of an analog version of the first one: the partner receives a signal, and amplifies it. The receiver then decodes based on the signal received fromt the source and from the source's partner.
  • Decode and forward is a variation of the first one, in which the partner encodes the packet from the source differently, so that the receiver has to different encoding to reconstruct the packet from (similar to the sensys paper by Dubois-Ferriere here, where I found this reference.)
  • Coded cooperation: each user sneds different portion of each user's code word via two independent fading paths. I guess at the simplest, it is the decode-and-forward above.


Performance is strongly improved by cooperation in terms of block error rate.

Paper is low level technical reading (no complex analysis or concepts) and clearly presented. It'd be interesting to know what applications --if any-- Nortel has in mind for this work.

3 comments:

Jay said...

I found your blog accidentally yesterday as I was looking for a certain IEEE paper (anti-packets...), and it looks very interesting. Many of the topics are fields of interest to me, mainly network coding and cooperative communication.

I agree with you that the paper is interesting and well structured but I believe it is far from being a thorough review. For instance, they don't mention delay diversity (where you introduce 'random' or 'specifically designed' delays are the relays).
I didn't have much time to go through the paper, but I guess many other aspects were not discussed.

Anyway, for anyone interested in cooperative communications, I would recommend some literature such as:
1: the PhD thesis by A. Sendonaris entitled 'Advanced Techniques for Next-Generation Wireless Systems'.
2: 'Cooperation in Wireless Networks: Principles and Applications. Real Egoistic Behavior is to Cooperate!', a book edited by Frank H.P. Fitzek and Marcos D. Katz
3: 'Network Coding Gain of Cooperative diversity', an IEEE paper by J. N. Laneman from 2004

For delay diversity, several papers are written by S. Ben Slimane and A. Osseiran on this issue.

Cost-efficiency deployment of relaying in cooperative communication is also studied throughly through many projects at KTH (Royal Institute of Technology).

Ramy Tannious said...

I just discovered your blog right now. I am a PhD student working with Prof. Nosratinia. The paper is an IEEE comm. magazine article. Therefore, it has a limit on the length and a limit on the content (no or very little math). Therefore, surely it comes short of being a through survey on this area. Also, after this article, many developments in this field has appeared.
I would suggest you check this
site for more thorough information:
http://students.itsoc.org/Cooperation/

Mitr said...

It would be so kind of you if you please forward me the the PhD thesis by A. Sendonaris entitled 'Advanced Techniques for Next-Generation Wireless Systems'.

I really need it badly

my email address is

menghwar@yahoo.com