Channel equalisation in particular for fading channels
First Claim
1. A digital radio system in which radio signals representing digital data symbols are transmitted over a radio channel using plural modulation levels, said digital radio system comprising:
- a radio receiver for receiving a plural-level modulation radio signal;
a first symbol estimator which gives a first estimate of a symbol represented by said received plural-level modulation radio signal,a second symbol estimator which gives a second estimate of a symbol represented by said received plural-level modulation radio signal, andmeans for providing (a) the first estimate of a symbol from the first symbol estimator when the first and second symbol estimator outputs are the same or have a predetermined relationship and (b), at other times, a symbol output based on the output of the second symbol estimator.
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Abstract
A digital radio system is described in which data symbols are transmitted over a radio channel using multi-level modulation. A receiver receives the multi-level modulation signal and a first symbol estimator gives a first estimate of a symbol represented by the received multi-level modulation signal and a second estimator gives a second estimate of a symbol represented by said signal; the output of the first estimator is provided when the first and second outputs are the same or have a predetermined relationship and an output based on the output of the second estimator is provided otherwise.
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Citations
10 Claims
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1. A digital radio system in which radio signals representing digital data symbols are transmitted over a radio channel using plural modulation levels, said digital radio system comprising:
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a radio receiver for receiving a plural-level modulation radio signal; a first symbol estimator which gives a first estimate of a symbol represented by said received plural-level modulation radio signal, a second symbol estimator which gives a second estimate of a symbol represented by said received plural-level modulation radio signal, and means for providing (a) the first estimate of a symbol from the first symbol estimator when the first and second symbol estimator outputs are the same or have a predetermined relationship and (b), at other times, a symbol output based on the output of the second symbol estimator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of processing received plural-level modulation signals representing digital data symbols in a digital radio system, said method comprising:
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making a first estimate of a symbol represented by a received plural modulation level signal, making a second estimate of a symbol represented by said received plural modulation level signal and providing as a symbol output of the radio system (a) the first symbol estimate when the first and second symbol estimates are the same or have a predetermined relationship and (b), at other times the second symbol estimate.
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10. A method of processing a received plural-level modulation signal in which:
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the received plural-level modulation signal is processed (a) by a first symbol estimator which gives a first estimate of a symbol represented by said received plural-level modulation signal and (b) by a second symbol estimator which gives a second estimate of a symbol represented by said received plural-level modulation signal, the output of the first symbol estimator being provided as the received symbol output when the first and second estimated symbol outputs are the same or have a predetermined relationship and, the output provided as the received symbol output is at other times based on the estimated symbol output of the second symbol estimator.
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Specification