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EP0667683A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Multi-user interference cancellation for cellular mobile radio systems

Assignee: Roke Manor Research Ltd
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Filing: 1995-01-11
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Granted: —
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Expires: 2015-01-11
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Abstract

Abstract A communication system wherein known data sequences characterise both wanted transmitted signals and interfering co-channel transmitted signals, comprising a receiver for receiving a wanted transmitted signal in the presence of unwanted co-channel interfering signals comprises signal sequence identifier means which includes a store for known data sequences and a correlator which serves to correlate received signals with the stored known data sequences, whereby the relative location in time of received signal sequences is identified, impulse response estimator means operative for estimating the impulse response of each signal the location of which has been identified, means responsive to the estimated impulse responses for producing in respect of each said response a set of possible signal configurations, and detector means including means for comparing the signals of each set with the received signal thereby to filter the wanted signal.

Inventors

  • 👤 Stephen William Wales

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-25 17:09
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/10; H04L; H04L25/00; H04L25/02; H04L25/0202; H04L25/0204

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 137 words
A communication system wherein known data sequences characterise both wanted transmitted signals and interfering co-channel transmitted signals, comprising a receiver for receiving a wanted transmitted signal in the presence of unwanted co-channel interfering signals comprises signal sequence identifier means which includes a store for known data sequences and a correlator which serves to correlate received signals with the stored known data sequences, whereby the relative location in time of received signal sequences is identified, impulse response estimator means operative for estimating the impulse response of each signal the location of which has been identified, means responsive to the estimated impulse responses for producing in respect of each said response a set of possible signal configurations, and detector means including means for comparing the signals of each set with the received signal thereby to filter the wanted signal.
Claim 2
Dependent Claim 137 words
A communication system wherein known data sequences characterise both wanted transmitted signals and interfering co-channel transmitted signals, comprising a receiver for receiving a wanted transmitted signal in the presence of unwanted co-channel interfering signals comprises signal sequence identifier means which includes a store for known data sequences and a correlator which serves to correlate received signals with the stored known data sequences, whereby the relative location in time of received signal sequences is identified, impulse response estimator means operative for estimating the impulse response of each signal the location of which has been identified, means responsive to the estimated impulse responses for producing in respect of each said response a set of possible signal configurations, and detector means including means for comparing the signals of each set with the received signal thereby to filter the wanted signal.
Claim 3
Dependent Claim 45 words
A system as claimed in Claim 1, wherein the sequence identifier means is fed with the received signal via a baseband signal converter and an A to D converter which in combination serve to provide digital signal samples of the received signal at baseband frequencies.
Claim 4
Dependent Claim 63 words
A system as claimed in Claim 1 or Claim 2, wherein the said means for comparing the signals of each set with the received signal comprises a metrics generator responsive to the said sets for providing signals for a sequence estimator comprising a trellis processor from which processor an output signal comprising a detected data sequence corresponding to the wanted signal is provided.
Claim 5
Independent Claim 22 words
A system as claimed in any preceding claim, wherein the baseband signal converter is fed with a signal from a single antenna.
Claim 6
Dependent Claim 30 words
A land based cellular mobile radio system comprising apparatus as claimed in any preceding claim which is used to provide a demodulator/equaliser function, thereby to provide improved co-channel interference suppression.

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