High Data Rate Alamouti Code From Field Extension

Authors:
R. Vishwanath;Manav R. Bhatnagar
Affiliations:
Department of Electrical Engineering, Indian Institute of Technology Delhi, New Delhi, India 110016;Department of Electrical Engineering, Indian Institute of Technology Delhi, New Delhi, India 110016
Venue:
Wireless Personal Communications: An International Journal
Year:
2007

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Abstract

Alamouti code is the only known Orthogonal Space Time Block Code (OSTBC) with rate-1. All other known orthogonal codes have rate less than unity. The orthogonal property of OSTBCs reduces the decoding complexity to a large extent. High data rate Space Time Block Codes for arbitrary number of transmit antennas were recently proposed based on Division Algebras. But these STBCs are not orthogonal. Therefore their decoding complexity is very high. In this paper we propose high data rate Alamouti codes from field extensions for two transmit antennas. Our codes have better coding gain than the both high rate codes from division algebra and the rate-1 Alamouti code.