Self-synchronizing equalization techniques and systems
First Claim
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1. A method for processing a signal received in a radiocommunication system comprising the steps of:
- (a) sampling said received signal, whereby intersymbol interference is introduced into said received signal;
(b) generating at least one channel estimate and an associated signal sample estimate associated with said received signal;
(c) estimating said introduced intersymbol interference;
(d) updating said at least one channel estimate and said associated signal sample estimate associated with said received signal using said estimated introduced intersymbol interference;
(e) repeating steps (b), (c) and (d) for a predetermined number of iterations; and
(f) outputting said channel estimate and an associated signal sample estimate.
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Abstract
Methods and systems for processing received radio signals are described wherein the finite alphabet quality of digital transmissions is utilized to improve performance. Nonsynchronous sampling of received signals introduces intersymbol interference which is compensated for by these methods and systems. Different types of signal modulation, and their impact on this type of intersymbol interference are discussed. A robust diversity combining technique, usable in conjunction with antenna arrays is developed.
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10 Claims
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1. A method for processing a signal received in a radiocommunication system comprising the steps of:
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(a) sampling said received signal, whereby intersymbol interference is introduced into said received signal;
(b) generating at least one channel estimate and an associated signal sample estimate associated with said received signal;(c) estimating said introduced intersymbol interference; (d) updating said at least one channel estimate and said associated signal sample estimate associated with said received signal using said estimated introduced intersymbol interference; (e) repeating steps (b), (c) and (d) for a predetermined number of iterations; and (f) outputting said channel estimate and an associated signal sample estimate. - View Dependent Claims (2, 3, 4, 5)
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6. A system for processing a radio signal comprising:
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means for sampling said radio signal, whereby intersymbol interference is introduced into said received signal; means for generating at least one channel estimate and an associated signal sample estimate associated with said received signal; means for estimating said introduced intersymbol interference; means for updating said at least one channel estimate and said associated signal sample estimate associated with said received signal using said estimated introduced intersymbol interference; means for iteratively applying said means for estimating and said means for updating for a predetermined number of iterations; and means for outputting said at least one channel estimate and said associated signal sample estimate. - View Dependent Claims (7, 8, 9, 10)
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Specification