Title :
A 2-Dimensional Transmit Beamforming Method: Performance Results for Slow Fading Channels
Author :
Razavi, Seyed Morteza
Abstract :
The main concern in slow fading channels is that the coded symbols can not be sent over multiple fades of the channel, because when they are transmitted across all strong and weak subchannels of a multiple-input multiple-output (MIMO) channel, the weak subchannels play the major role in the degradation of the total performance of the channel. In this paper, we propose a 2-dimensional transmit beamforming (2-DTBF) method that enables us to code across the two strongest subchannels of a MIMO channel, and by combining Alamouti space-time coding with this method, we are able to utilize both spatial multiplexing and diversity. We will show that the spectral efficiency of the proposed scheme is greater than that of orthogonal space-time block codes (OSTBCs) and is equal to those of quasi-OSTBCs (QOSTBCs) and space-time trellis codes (STTCs) for the same number of transmit antennas. We will also illustrate that the proposed scheme has better bit error rate (BER) performance than OSTBCs and QOSTBCs and has better frame error rate (FER) performance than STTCs at asymptotically low signal-to-noise ratio (SNR) regime.
Keywords :
MIMO communication; antenna arrays; diversity reception; error statistics; fading channels; orthogonal codes; space-time block codes; transmitting antennas; trellis codes; 2-dimensional transmit beamforming method; Alamouti space-time coding; BER performance; MIMO channel; bit error rate; frame error rate performance; low signal-to-noise ratio regime; multiple-input multiple-output channel; orthogonal space-time block codes; quasi codes; slow fading channels; space-time trellis codes; spatial diversity; spatial multiplexing; spectral efficiency; transmit antennas; Array signal processing; Block codes; Decoding; MIMO; Signal to noise ratio; Transmitting antennas;
Conference_Titel :
Vehicular Technology Conference (VTC Spring), 2011 IEEE 73rd
Conference_Location :
Yokohama
Print_ISBN :
978-1-4244-8332-7
DOI :
10.1109/VETECS.2011.5956412