Receive Beamforming Techniques for an LTE-Based Mobile Relay Station With a Uniform Linear Array

• Published in: IEEE transactions on vehicular technology Vol. 64; no. 7; pp. 3299 - 3304
• Main Authors: Pec, Rothna, Bon Woo Ku, Kyu Seok Kim, Yong Soo Cho
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.07.2015; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Array signal processing; Arrays; Direction-of-arrival estimation; Estimation; OFDM; Synchronization; Vectors; Carry frequency offset (CFO); direction of arrival (DoA); joint receive beamforming (JB); mobile relay station (MRS); long-term evolution (LTE); cell identity (cell ID); orthogonal frequency-division multiplexing (OFDM); spatially separated receive beamforming (SB)
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/TVT.2014.2352675

A mobile relay station (MRS) with soft handover experiences performance degradation because the received signal at the MRS located between two base stations (BSs) is the sum of these two signals with different carrier frequency offsets (CFOs). In this paper, two receive beamforming techniques with CFO compensation (a joint receive beamforming (JB) technique and a spatially separated receive beamforming (SB) technique) are proposed for the MRS with a uniform linear array (ULA) in orthogonal frequency-division multiplexing (OFDM) systems. The SB technique is shown to be robust against CFO errors and can be effectively used for the MRS in a multipath fading channel. The performance of the proposed techniques is evaluated via simulation in a Long Term Evolution (LTE) environment.