Optimal Beam-Forming Design in Cognitive Relay Networks under Interference Threshold

Abstract:

Recently, a new model for cognitive radio networks appears, in which a cognitive user (CU) can relay the primary data stream to improve the performance of the primary user s communication. Traditionally, the transmitter of the cognitive users will send data to the receiver of the cognitive users and relay the data sent from the primary user (PU) in different time slots. However, Multiple Input Multiple Output (MIMO) provides a remarkable increase in the spectral efficiency, which can transmit multiple independent data streams in a time slot with MIMO antenna. Based on the MIMO technique, we propose a novel framework, in which the cognitive user near by the primary user is equipped with MIMO antenna. In this paper, we search for the maximum sum-rate of the cognitive user, limiting the interference to the primary users. Simulation results show that the proposed method can really improve the performance of the cognitive relay networks.

• Periodical: Advanced Materials Research (Volumes 850-851)
• Pages: 561-566
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.850-851.561
• Online since: December 2013
• Authors: Zi Jun Liu*, Zhan Gao, Guo Xin Li, Hai Tao Zhang
• Keywords: Cognitive Ratio Network, Maximum Sum-Rate, Multiple Input Multiple Output, Relay-Node

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