Pulse or digital communications – Repeaters – Testing
Patent
1992-09-30
1994-06-21
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
375100, 375101, 4552261, 371 51, H04B 346, H04B 1700, H04Q 140
Patent
active
053234219
ABSTRACT:
The present disclosure includes a discussion of a method of and apparatus for channel quality estimation (CQE) in a receiver. Each channel is divided into observation intervals and sub-intervals. The duration of the sub-interval is chosen as the largest interval in which the channel is essentially static. The CQE collects error information for each symbol of the sub-interval, forming a sub-interval error value. The CQE maps the sub-interval error value into a sub-interval bit error rate (BER) estimate. The mapping is a non-linear function dependent on the specific radio system. Then, the CQE averages the sub-interval BER estimates over the entire observation interval, forming an interval BER estimate. Finally, the CQE compares the interval BER estimate to a predetermined threshold, forming a channel quality estimation decision for each observation interval.
REFERENCES:
patent: 4817117 (1989-03-01), Tasto et al.
patent: 5214687 (1993-05-01), Kansakoski et al.
LaRosa et al., "A Fully Digital Hardware Detector for .pi./4 QPSK", Chicago Corporate Research and Development Center, Motorola Inc. 1992.
Carney Michael J.
LaRosa Christopher P.
Chin Stephen
Dailey Kirk W.
Motorola Inc.
Webster Bryan
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