Joint Design of Uplink-Downlink MIMO Relay Networks Using Duality

Seungwon CHOI  Jung-Hyun PARK  Seokkwon KIM  Dong-Jo PARK  

IEICE TRANSACTIONS on Communications   Vol.E95-B    No.1    pp.333-336
Publication Date: 2012/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E95.B.333
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
minimum mean squre error (MMSE),  relay,  MIMO,  duality,  

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This letter introduces a joint design method for uplink-downlink multiple-input multiple-output (MIMO) relay communication systems in which the source nodes transmit information to the destination nodes with the help of a relay. We propose a signal forwarding schceme based on the minimum mean-square error (MMSE) approach in uplink relay systems. Exploiting the duality of relay systems, we also propose a relaying scheme for downlink relay systems. Simulation results confirm that the proposed joint design method improves the performance of the relay systems compared with that of conventional relaying schemes in uplink and downlink MIMO relay systems.