Apparatus and method for direct measurement of channel state...

Details Apparatus and method for direct measurement of channel state... Apparatus and method for direct measurement of channel state...

2004-03-12

2009-02-03

Payne, David C (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S343000, C375S340000

Reexamination Certificate

active

07486736

ABSTRACT:
An apparatus and method for direct measurement of the channel state of a receiver, such as an OFDM (Orthogonal Frequency Division Multiplexing) receiver. The apparatus adapts a frequency selective channel using a squared Euclidean distance between a received signal value and a de-mapped value for measurement of the channel state and estimates the CSI (Channel State Information) which is also suitable for signal processing with co-channel interference. The estimated CSI may be used in a bit metric calculation of subsequent error correction decoders, such as a Viterbi decoder, to increase system SNR (Signal-to-Noise Ratio) gain. Because receiving equipment, such as digital televisions, receive clearer DVB-T (Terrestrial Digital Video Broadcasting) signals, clearer pictures with less distortion can be displayed, for example, on the digital television.

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Weon-cheol Lee et al “Performance Analysis of Viterbi Decoder Using Channel State Information in COFDM System”, IEEE Transactions On Broadcasting, vol. 44, No. 4, Dec. 1998.
Office Action for corresponding German Application No. 10 2004 033442.0 dated May 11, 2006.

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