SYSTEM AND METHOD FOR MEASURING CHANNEL QUALITY INFORMATION IN A COMMUNICATION SYSTEM

A system and method to measure channel quality in terms of signal to interference plus noise ratio for the transmission of coded signals over fading channels in a communication system. A Viterbi decoder metric for the Maximum Likelihood path is used as a channel quality measure for coherent and non-...

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Bibliographic Details
Main Authors NANDA, SANJIV, BALACHANDRAN, KRISHNA, EJZAK, RICHARD PAUL, KADABA, SRINIVAS R
Format Patent
LanguageEnglish
French
Published 09.12.2003
Edition6
Subjects
BASIC ELECTRONIC CIRCUITRY
CODE CONVERSION IN GENERAL
CODING
DECODING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
WIRELESS COMMUNICATIONS NETWORKS
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Summary:A system and method to measure channel quality in terms of signal to interference plus noise ratio for the transmission of coded signals over fading channels in a communication system. A Viterbi decoder metric for the Maximum Likelihood path is used as a channel quality measure for coherent and non-coherent transmission schemes. This Euclidean distance metric is filtered in order to smooth out short term variations. The filtered or averaged metric is a reliable channel quality measure which remains consistent across different coded modulation schemes speeds. The filtered metric is mapped to the signal to interference plus noise ratio per symbol using a threshold based scheme. Use of this implicit signal to interference plus noise ratio estimat e is used for the mobile assisted handoff in a cellular system, power control and data rat e adaptation in the transmitter.
Bibliography:Application Number: CA19992263060