H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 17/00 (2006.01) H04B 7/005 (2006.01) H04L 25/02 (2006.01) H04L 7/04 (2006.01)
Patent
CA 2076061
ABSTRACT Radio signals are transmitted over a fading radio channel and are filtered and sampled in a receiver to obtain a digital signal (y(n)). A channel equalizer (5) has an equalizing filter (CEST) in which a channel estimate (h(n/n-L)) is formed with the aid of a known synchronizing sequence. A Viterbi analyzer (VIT) decides symbols (d(n-L)) with the aid of the channel estimate. An es- timated time derivative of the channel estimate (h(n/n-L)) is formed and adapted with the aid of the decided symbols (d(n-L)). The channel estimate (h(n/n-L)) is adapted to the radio channel by the derivative estimate and the decided symbols (d(n-L)). In the event of fading with rapidly varying signal strength (y(n)), the channel estimate (h(n/n-L)) is adapted slowly and is predicted mainly through the derivative estimate which varies relatively evenly. The digital signal (y(n)) is stored in a memory (M) and an initial value is formed for the derivative estimate as a dif- ference between two known channel estimates divided by a time difference therebetween. The known channel estimate may belong to two separate synchronizing sequences or may belong to one synchronizing sequence and a fading time point in which the channel estimate has zero value. Publication Figure: 7
Gudmundson Perols Bjorn Olof
Larsson Lars Gustav
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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