System and method for measuring channel quality information

Details System and method for measuring channel quality information System and method for measuring channel quality information

1997-08-25

2000-08-22

Vo, Don N.

Pulse or digital communications

Testing

Signal noise

4552263, H04B 1700, H04B 346, H04Q 120

Patent

active

061083747

ABSTRACT:
A system and method to measure channel quality in terms of signal to noise ratio for the transmission of coded signals over fading channels. A Viterbi decoder metric for the Maximum Likelihood path is used as a channel quality measure. 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 and at different mobile speeds. The filtered metric is mapped to the signal to noise ratio per symbol using a threshold based scheme. Use of this implicit signal to noise ratio estimate is used for the mobile assisted handoff and data rate adaptation in the transmitter.

REFERENCES:
patent: 5285478 (1994-02-01), Wornell et al.
patent: 5541955 (1996-07-01), Jacobsmeyer
patent: 5623484 (1997-04-01), Muszynski
patent: 5809086 (1998-09-01), Ariyavisitakul

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