Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1994-08-02
1996-01-02
Tse, Young
Pulse or digital communications
Receivers
Interference or noise reduction
375340, 371 43, H04B 702, H04L 102
Patent
active
054815720
ABSTRACT:
Signals in synchronizing sequences and data sequences are transmitted over a fading channel to a sequence estimation receiver. The signals are received by a plurality of mutually separated antennas and sampled to produce received antenna signals (S.sub.in,r (k)). Using the received antenna signals, part transmission channel estimates (h.sub.est,r) are formed for each antenna. These part channel estimates are used to form precomputed metric values (f.sub.a,r ((.DELTA.T.sub.ij),g.sub.a (.DELTA.T.sub.ij)). For the sequence estimation algorithm, branch metric values (m(.DELTA.T.sub.ij,k)) are formed by combining the precomputed metric values with the received antenna signals for state transitions (.DELTA.T.sub.ij). For one state transition there is formed a metric value such as the sum of a metric value (M(T.sub.j,k-1)) for an old state (T.sub.j) at a preceeding sampling time point (k-1) with a branch metric value (m(.DELTA.T.sub.ij,k)). Corresponding metric values are formed for all state transitions to the new state (T.sub.i) and the state corresponding to the smallest of these metric values is chosen in accordance with the sequence estimation algorithm.
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Eriksson Per-Olof
Skold Johan
Ericsson Inc.
Stasik Eric L.
Tse Young
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