NDLI: Cooperative multiple access channels with oblivious encoders

Content Provider	IEEE Xplore Digital Library
Author	Kopetz, T. Permuter, H.H. Shamai, S.
Copyright Year	2015
Description	Author affiliation: Ben Gurion Univ. of the Negev, Beer-Sheva, Israel (Kopetz, T.; Permuter, H.H.) \|\| Technion, Haifa, Israel (Shamai, S.)
Abstract	In this paper we study the cooperative multiple access channel (MAC) with oblivious encoders and characterize its capacity region. Cooperation means that one encoder sends a message to the other encoder via a rate-limited link prior to transmission, while partial cribbing means that one encoder obtains a deterministic function of the other encoder's output. Partial cribbing can be done strictly-causally, causally, and non-causally. Prior work in this field dealt with the case where the two encoders are aware of each other's chosen codebook. In this paper we consider the case of oblivious encoding, where each user in a network is unaware of the codebook chosen by other users. Since an oblivious encoder cannot decode the message sent from another encoder, it cannot implement the Decode-and-Forward coding scheme, as is usually done in cases of partial cribbing with codebook-aware encoders. To overcome this, we introduce the method of Bin-and-Forward, which does not require decoding. Since the possible cribbed signals are not known a priori, in our new coding scheme binning is done on all typical possible cribbed sequences. Instead of sending a decoded message, the oblivious encoder sends the bin in which the cribbed sequence lies. We compare the gain achieved using cooperation and partial cribbing with and without codebook knowledge. Evidently, in the cases of causal and non-causal perfect cribbing, the capacity region is the same for oblivious and codebook-aware encoding. As an example, we consider the Gaussian MAC with cooperation and quantized cribbing. For this model, we give an achievability scheme that shows how knowing the codebooks affects the capacity region for cooperation alone, for partial cribbing alone, and for combined cooperation and partial cribbing.
Starting Page	26
Ending Page	30
File Size	794203
Page Count	5
File Format	PDF
ISSN	21578117
e-ISBN	9781467377041
DOI	10.1109/ISIT.2015.7282410
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-06-14
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Encoding Time sharing Bin-and-Forward Block Markov coding Cooperation Gaussian MAC Multiple access channels Oblivious encoding Partial cribbing
Content Type	Text
Resource Type	Article

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