Trellis based maximum likelihood signal estimation method and apparatus for blind joint channel estimation and signal detection
AssigneeMitsubishi Electric Research Laboratories, Inc.
InventorsLei Cao, Jinyun Zhang, Phillip Orlik, Daqing Gu
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Abstract
A method and system performs blind joint channel estimation and signal detection in a communication system that includes multiple channels for transmitting symbols. The multiple channels are estimated using a small number of symbols initially received through the multiple channels. When the channels have been estimated, a single best channel is selected. From then on, the bulk of the symbols are detected only on the best channel, while the best channel is updated.
Claims15
An apparatus for blind joint channel estimation and signal detection in a communication system including a plurality of channels for transmitting symbols, comprising:
- means for estimating the plurality of channels using symbols received from the plurality of channels, the means for estimating including a best channel selector connected to an output of a status monitor;
- means for selecting a best channel from the estimated plurality of channels;
- means for detecting symbols received only on the best channel while updating only the best channel, the means for detecting including a multiple channel selector connected to an output of a minimum path metric determiner;
- and
- a switch connected to the best channel selector and the multiple channel selector, the switch configured to connect an input signal including the symbols to the means for estimating the plurality of channels and the means for detecting symbols received only on the best channel.
A method for blind joint channel estimation and signal detection in a communication system including a plurality of channels for transmitting symbols, comprising:
- estimating the plurality of channels using symbols received from the plurality of channels;
- maintaining, concurrently, multiple estimates of the plurality of channels using a parallel list Viterbi algorithm;
- selecting a best channel from the estimated plurality of channels, the best channel having a minimum path metric and correct evolution;
- and
- detecting symbols received only on the best channel while updating the best channel in a single pass, wherein the updating is delayed after detecting the symbols on the best channel, the delay being less than ten symbols to reduce isolated high value noise that can diverge the updating of the best channel.
Dependencies are inferred from the claim text.