发明名称 |
METHOD AND APPARATUS FOR SYMBOL DECODING USING A VARIABLE NUMBER OF SURVIVOR PATHS |
摘要 |
A low complexity, high performance trellis decoder adapts the complexity of the trellis decoding process based on a current condition of the communications system. A trellis structure of nodes and branches is developed to decode the sequence of symbols received over a communications channel. Each set of nodes in the trellis represents the possible values of a received symbol at one time instant. Each branch defines a specific transition between nodes at different time instants, and each branch has an associated branch metric or weight. A linkage of branches between the nodes and the trellis defines a path through the trellis that represents one possible symbol sequence, and an accumulated metric/weight is generated for each possible path through the trellis. A variable number M survivor paths through the trellis is determined based on their accumulated path metric/weights. The value of the variable M depends on the current condition of the communications system. Once the value of M is adapted to the current condition, the sequence of received symbols is decoded using M survivor paths through the trellis.
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申请公布号 |
CA2241691(A1) |
申请公布日期 |
1997.07.10 |
申请号 |
CA19962241691 |
申请日期 |
1996.12.23 |
申请人 |
ERICSSON INC. |
发明人 |
ANDERSON, JOHN B.;KOILPILLAI, RAVINDER DAVID;CHENNAKESHU, SANDEEP |
分类号 |
H03M13/25;H04B1/10;(IPC1-7):H03M13/25 |
主分类号 |
H03M13/25 |
代理机构 |
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地址 |
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