Sum-Rate Maximization Schemes for K-User MISO Interference Channels With a Cognitive Relay
- Authors
- Shin, Hun Min; Lee, Sang-Rim; Kong, Han-Bae; Lee, Inkyu
- Issue Date
- 11월-2015
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- MIMO systems; cognitive relay; interference channels with a cognitive relay
- Citation
- IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, v.14, no.11, pp.6448 - 6458
- Indexed
- SCIE
SCOPUS
- Journal Title
- IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
- Volume
- 14
- Number
- 11
- Start Page
- 6448
- End Page
- 6458
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/92067
- DOI
- 10.1109/TWC.2015.2454496
- ISSN
- 1536-1276
- Abstract
- In this paper, we consider K-user multiple-input single-output interference channels with a cognitive relay. Assuming that data of all transmitters and channel state information are known at the cognitive relay, we design a linear precoder for the cognitive relay with the aim of maximizing the sum-rate without changing the transmitter operations at all transmitters. We first define the receiver set as a set which contains a part of the receivers, and then introduce a performance metric called "partial signal-to-interference-plus-noise ratio" (PSINR) based on the receiver set. Then, we can obtain a precoder at the cognitive relay by solving the PSINR maximization problem. The optimal receiver set which yields the maximum sum-rate can be identified by checking all possible receiver sets. Since this exhaustive search has prohibitive complexity, we develop a low complexity set search method by utilizing the properties of the optimal receiver set. Combining the PSINR maximization problem and the low complexity search method, we finally propose a precoder design scheme for the sum-rate maximization. Numerical simulation results confirm that the proposed scheme shows performance close to the projected gradient method with much reduced complexity.
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