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US 6,333,953 B1Granted
System and methods for selecting an appropriate detection technique in a radiocommunication system
AssigneeEricsson Inc.
InventorsGregory E. Bottomley, Jyun-Cheng Chen, R. David Koilpillai
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Abstract
Techniques for adapting detection schemes used in receivers for receiving radio signals are described. The received signal is processed to determine, for example, an amount of time dispersion present in the radio channel. Based on this determination an appropriate detection scheme is selected for detecting the transmitted symbols. Various techniques for determining the dispersive or non-dispersive nature of the channel are described.
Claims17
A receiver comprising:
- processing circuitry for receiving a radio signal and producing signal samples therefrom;
- a detector controller which evaluates said signal samples and outputs a variable number, N, of channel taps needed for detection;
- and
- a detector, responsive to an output of said detector controller, for detecting symbols using one of a plurality of detection schemes which is selected based on the variable value of N.
1 more element
A receiver comprising:
- means for receiving a radio signal to produce a received signal;
- means for processing said received signal to produce complex samples;
- means for processing said complex samples to produce signal power estimates and noise power estimates;
- means for comparing said signal power estimates and said noise power estimates to generate a detector control signal;
- and
- means for detecting digital symbols within said received signal using said complex samples and said control signal to determine a variable number of channel taps, N, needed to properly receive said received signal.
3 more elements
A method for selecting a number of channel taps for a detection scheme in a receiver comprising the steps of:
- (a) initializing a variable number of channel taps N to one;
- (b) evaluating a channel statistic using said variable number of channel taps N;
- (c) comparing said channel statistic to a threshold;
- (d) selectively selecting N as a number of channel taps used in a detection scheme based upon a result of said comparison step;
- and
- (e) otherwise, incrementing said variable number of channel taps N and performing another iteration of steps (b)-(e).
3 more elements
Dependencies are inferred from the claim text.