H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/95
H04B 1/16 (2006.01) H01Q 21/29 (2006.01) H03M 13/23 (2006.01) H03M 13/41 (2006.01) H04B 1/10 (2006.01) H04B 7/08 (2006.01) H04L 1/06 (2006.01) H04L 25/03 (2006.01) H04L 25/02 (2006.01)
Patent
CA 2036423
Signals in synchronizing sequences and data sequences are trans- mitted over a fading channel to a Viterbi-receiver (11, 12). The signals are received by antennas and sampled to received antenna signals (Sin,r(k)). Part channel estimates (hest,r) for the individual antennas are formed. For Viterbi-analysis, assumed input signals (Sa,r(.DELTA.Tij,k)) for the data sequence are produced with the aid of the part channel estimates (hest,r). Part metric values (mr(.DELTA. Tij,k)) are formed as a difference between the received antenna signal (s, in,r(k)) and corresponding assumed input signals (Sa,r(.DELTA.Tij,k)) for Viterbi state transitions (.DELTA.Tij). For one state transition there is formed a metric value such as the sum of a metric value ((M(T.,k-1)) for an old state (T.) at a preceding sampling time point (k-1) increased with a weighted (Kr) sum of the part metric values (mr(.DELTA.Tij,k)) belonging to individual part channel estimates (hest,r). Corresponding metric values are formed for all state transitions to the new state (Ti) and the smallest of these metric values is chosen in accordance with the Viterbi-algorithm.
Backstrom Tomas Olof
Kahre Ragnar Erik
Stjernvall Jan-Erik
Marks & Clerk
Telefonaktiebolaget Lm Ericsson
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