Open Access System for Information Sharing

Login Library

 

Article
Cited 11 time in webofscience Cited 12 time in scopus
Metadata Downloads

Degrees of Freedom for the MIMO Gaussian K-way Relay Channel: Successive Network Code Encoding and Decoding SCIE SCOPUS

Title
Degrees of Freedom for the MIMO Gaussian K-way Relay Channel: Successive Network Code Encoding and Decoding
Authors
Lee, NChun, J
Date Issued
2014-03
Publisher
IEEE
Abstract
This paper studies a network information flow problem for a multiple-input multiple-output (MIMO) Gaussian wireless network with K users and a single intermediate relay having M antennas. In this network, each user sends a multicast message to all other users while receiving K - 1 independent messages from the other users via an intermediate relay. This network information flow is termed a MIMO Gaussian K-way relay channel. For this channel, it is shown that the optimal sum degrees of freedom (sum-DoF) is KM/K - 1, assuming that all nodes have global channel knowledge and operate in full-duplex. A converse argument is derived by cut-set bounds. The achievability is shown by a repetition coding scheme with random beamforming in encoding and a zero-forcing method combined with self-interference cancelation in decoding. Furthermore, under the premise that all nodes have local channel state information at the receiver only and operate in half-duplex mode, it is shown that a total K/2 DoF is achievable when M=K-1. The key to showing this result is a novel encoding and decoding scheme, which creates a set of network code messages with a chain structure during the multiple access phase and performs successive interference cancelation using side-information for the broadcast phase. One major implication of the derived results is that efficient exploitation of the transmit message as sideinformation leads to an increase in the sum-DoF gain in a multiway relay channel with multicast messages.
URI
https://oasis.postech.ac.kr/handle/2014.oak/37776
DOI
10.1109/TIT.2014.2298138
ISSN
0018-9448
Article Type
Article
Citation
IEEE Transactions on Information Theory, vol. 60, no. 3, page. 1814 - 1821, 2014-03
Files in This Item:
There are no files associated with this item.

qr_code

  • mendeley

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Related Researcher

Researcher

이남윤LEE, NAMYOON
Dept of Electrical Enginrg
Read more

Views & Downloads

Browse