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The performance of standard Alamouti space-frequency block code (SFBC) degrades in highly frequency-selective channels since quasi static fading is required for adjacent subcarriers. An enhanced Alamouti decoder allows a high reliability and capacity enhancement. In this paper, we propose an enhanced Alamouti space frequency block decoding scheme for multiple-input multiple-output (MIMO) and orthogonal...
Two new constellations, non-rectangular QAM (NQAM) and snail shift keying are introduced to replace the rectangular QAM constellation for discrete multi-tone modulation. The major property of these schemes is their non-symmetric configurations where demands of subscribers can be prioritised conveniently. These constellation algorithms, compared to well-known QAM modulation especially NQAM with the...
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