Apparatus and method for adaptively modulating signal by...

Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train

Reexamination Certificate

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Reexamination Certificate

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07453947

ABSTRACT:
An apparatus for adaptively modulating/demodulating signals in a multi-input multi-output (MIMO) system having a layered time-space architecture detector and a method thereof is disclosed. The apparatus includes: a bit and power allocation information calculator for deciding an equivalent channel gain in a reverse order of Vertical-Bell laboratories Space Time (V-BLAST) based on MIMO channel information feedbacked from a receiver and determining the number of bits and transmission power to be transmitted to each transmitting antenna by using the equivalent channel gain; and adaptive modulation means for modulating signal of each layer with corresponding modulation method based on the determined number of bits and transmitting power, controlling the transmitting power and transmitting the adaptively modulated signal through each transmitting antenna. The present invention can improve performance without increase of implementation complexity and easily expand to MIMO-OFDM system by adaptively modulating and demodulating signals in reverse order of conventional V-BLAST detection method.

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patent: 6097771 (2000-08-01), Foschini
patent: 6317466 (2001-11-01), Foschini et al.
patent: 7120199 (2006-10-01), Thielecke et al.
patent: 98-13075 (1998-04-01), None
G.G.Raleigh et al.; “Spatio-Temporal Coding For Wireless Communications”; 0-7803-3336-5/96 IEEE (pp. 1809-1814).
Cheong Yui Wong et al.; “Multiuser OFDM With Adaptive Subcarrier, Bit and Power Allocation”; IEEE Journal on Selected Areas in Comm., vol. 17, No. 10, Oct. 1999; pp. 1747-1758.
Ka-Wai Ng, et al.; “A Simplified Bit Allocation . . . Fading Channels”; 0-7803-7400-2/2/02 IEEE (pp. 411-415).
Ka-Wai Ng, et al.; “Iterative Bit & Power . . . Fading Channel”; 0-7803-7376-6/02/02 IEEE (pp. 271-275).
P.W. Wolniansky, et al.; “V-Blast: An Architecture . . . Wireless Channel”; 0-7803-4900-8/98 1998 IEEE (pp. 295-300).

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