Method of and apparatus for reducing the complexitiy of a diversity combining and sequence estimation receiver
US5481572A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1994 |
| Grant date | Jan 2, 1996 |
| Priority date | — |
| Expiry date | Aug 2, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.