DocumentCode :
3605775
Title :
On the Capacity Regions of Two-Way Diamond Channels
Author :
Ashraphijuo, Mehdi ; Aggarwal, Vaneet ; Xiaodong Wang
Author_Institution :
Electr. Eng. Dept., Columbia Univ., New York, NY, USA
Volume :
61
Issue :
11
fYear :
2015
Firstpage :
6060
Lastpage :
6090
Abstract :
In this paper, we study the capacity regions of two-way diamond channels. We show that for a linear deterministic model the capacity of the diamond channel in each direction can be simultaneously achieved for all values of channel parameters, where the forward and backward channel parameters are not necessarily the same. We divide the achievability scheme into three cases, depending on the forward and backward channel parameters. For the first case, we use a reverse amplify-and-forward strategy in the relays. For the second case, we use four relay strategies based on the reverse amplify-and-forward with some modifications in terms of replacement and repetition of some stream levels. For the third case, we use two relay strategies based on performing two rounds of repetitions in a relay. The proposed schemes for deterministic channels are used to find the capacity regions within constant gaps for two special cases of the Gaussian two-way diamond channel. First, for the general Gaussian two-way relay channel, the capacity within a constant gap is achieved with a simpler coding scheme as compared with the prior works. Then, a special symmetric Gaussian two-way diamond model is considered and the capacity region is achieved within four bits.
Keywords :
Gaussian channels; amplify and forward communication; channel capacity; encoding; relay networks (telecommunication); Gaussian two-way diamond channel; Gaussian two-way relay channel; amplify-and-forward strategy; channel capacity region; coding scheme; deterministic channel; linear deterministic model; relay strategy; stream level; Channel models; Diamonds; Encoding; Lattices; Relays; Signal to noise ratio; Transmitters; Gaussian channel; Two-way diamond channel; cut-set bound; linear deterministic channel; rate region with constant gap; reverse amplify-and-forward; two-way relay channel;
fLanguage :
English
Journal_Title :
Information Theory, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9448
Type :
jour
DOI :
10.1109/TIT.2015.2478461
Filename :
7265068
Link To Document :
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