Effects of Channel Estimation on Multiuser Virtual MIMO-OFDMA Relay-Based Networks. (14th November 2010)

• Record Type: Journal Article
• Authors: Gil Jiménez, Víctor P.; Ribeiro, Carlos; Gameiro, Atilio; Armada, Ana García
• Other Names: Gorce Jean-Marie Academic Editor.
• Is Part Of: EURASIP journal on wireless communications and networking. Volume 2010(2010)
• Publication Date: 2010-11-14
• Subjects: Wireless communication systems -- Periodicals; Signal processing -- Periodicals; 621.38405
• DOI: 10.1155/2010/764784
• Languages: English
• ISSNs: 1687-1499

Abstract

Abstract : A practical multiuser cooperative transmission scheme denoted as Virtual Maximum Ratio Transmission (VMRT) for multiple-input multiple-output-orthogonal frequency division multiple access (MIMO-OFDMA) relay-based networks is proposed and evaluated in the presence of a realistic channel estimation algorithm and using low-density parity-check (LDPC) codes. It is shown that this scheme is robust against channel estimation errors. It offers diversity and array gain, keeping the complexity low with a multiuser and multiantenna channel estimation algorithm that is simple and efficient. In addition, the combination with LDPC codes provides improved gains; diversity gains larger than 6 dB can be easily obtained with a reduced number of relays. Thus, this scheme can be used to extend coverage or increase system throughput by using simple cooperative OFDMA-based relays.