Multiplex communications – Generalized orthogonal or special mathematical techniques – Particular set of orthogonal functions
Reexamination Certificate
2006-06-20
2009-10-27
Shah, Chirag G (Department: 2419)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Particular set of orthogonal functions
C375S262000, C375S267000, C375S341000, C714S794000, C714S795000, C714S796000, C704S242000
Reexamination Certificate
active
07609615
ABSTRACT:
A method and apparatus for performing channel compensation and symbol demodulation using an estimated channel impulse response during coherent demodulation of a received Orthogonal Frequency Division Multiplexing (OFDM) signal are provided. In the apparatus, an FFT processor IFFT-processes a received signal. A channel compensator generates a channel-compensated signal by multiplying the FFT received signal by an estimated channel impulse response and calculates the power of the estimated channel impulse response. A symbol demodulator sets the power of the estimated channel impulse response as a reference point defining a minimum distance between signal points in a signal constellation, and decides soft metric values for channel decoding using the reference point and I-channel and Q-channel signal components of the channel-compensated signal. A decoder recovers information bits by decoding the soft metric values.
REFERENCES:
patent: 7065146 (2006-06-01), Lou et al.
patent: 7346135 (2008-03-01), Narasimhan
Miniuk, Mary, Channel Impulse Response and Its Relationship to Bit Error Rate at 28 GHz, Dec. 2003, pp. 6-7.
Ha Ji-Won
Park Sung-Jin
Roh Hee-Jin
Yim Eun-Jeong
Roylance Abrams Berdo & Goodman L.L.P.
Samsung Electronics Co,. Ltd.
Shah Chirag G
Young Steve
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