MMSE-Based Filter Designs for Cognitive Multiuser Two-Way Relay Networks
- Authors
- Park, Haewook; Song, Changick; Lee, Hoon; Lee, Inkyu
- Issue Date
- 4월-2015
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Cognitive radio; convex optimization; two-way relay
- Citation
- IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, v.64, no.4, pp.1638 - 1643
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
- Volume
- 64
- Number
- 4
- Start Page
- 1638
- End Page
- 1643
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/93922
- DOI
- 10.1109/TVT.2014.2331245
- ISSN
- 0018-9545
- Abstract
- This paper considers cognitive multiuser two-way relay networks (MU-TRNs) where multiple secondary users (SUs) concurrently exchange their data with other SUs with an aid of a two-way relay in licensed primary networks. In this paper, we particularly focus on linear relay filter designs that effectively minimize the mean square error of SUs while providing a certain level of quality of service for the primary network. To this end, we first propose an iterative algorithm that identifies a solution based on an alternating optimization technique. Then, a closed-form relay filter design is presented, which employs a high signal-to-noise ratio approximation to reduce the computational complexity. Through the simulation results, we confirm that the proposed closed-form relay filter design outperforms conventional approaches and provides the performance close to the proposed iterative algorithm with much reduced complexity.
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