Device and method for data signal detection in the presence of distortion and interference in communication systems
AssigneeMotorola, Inc.
InventorsJian Yang, M. Vedat Eyuboglu
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Abstract
The present invention provides a device (200, 300, 400) and method (500) in multi-access communications system for reliably receiving burst transmissions from users in the presence of distortion and interference. The signal detector of the invention incorporates separate modules (280, 290; 302, 304; 402, 404) for distortion cancellation and interference suppression. This allows efficient tracking of distortion and interference characteristics.
Claims23
A device for estimating a signal point sequence {X(k)}, from a received signal that is {X(k)} received in the presence of distortion and interference, the device comprising:
- A) a storage unit, operably coupled to a decision unit, for storing at least a first candidate sequence, wherein each candidate sequence represents a predetermined candidate estimated sequence {Xi(k)}, i=1 . . . N, where i is a positive integer and N represents a total number of stored candidate sequences;
- and
- B) an intersymbol interference canceller, operably coupled to receive at least the received signal, for providing, for each candidate sequence, a first modified received signal;
- and
- C) an interference suppresser, operably coupled to the intersymbol interference canceller and to the storage unit, for providing a second modified received signal for each candidate sequence;
- and
- D) the decision unit, operably coupled to the interference suppresser, for estimating the sequence {X(k)}, based at least in part on the second modified received signal/signals, and for storing said candidate sequence/sequences in the storage unit, and for outputting a final estimate for the signal point sequence.
A device for estimating a signal point sequence {X(k)}, for a signal that is received in the presence of distortion and interference, the device comprising:
- A) an intersymbol interference canceller, coupled to receive the signal, for providing a first modified received signal, wherein said first modified received signal is computed based on at least a first sample of the received signal using a distortion filter;
- B) a storage unit, coupled to a decision unit, for storing at least a first candidate sequence, each candidate sequence representing a candidate estimated sequence {Xi(k)}, i=1 . . . N where i is a positive integer and N represents a total number of stored candidate sequences stored;
- C) an interference suppresser, operably coupled to the intersymbol interference canceller and to the storage unit, for providing a second modified received signal for each candidate sequence;
- and
- D) the decision unit, operably coupled to the interference suppresser, for estimating the sequence {X(k)}, based at least in part on the second modified received signal/signals, and for storing said candidate sequence/sequences in the storage unit, and for outputting a final estimate for the signal point sequence.
A method for estimating a signal point sequence {X(k)}, from a received signal that is {X(k)} received in the presence of distortion and interference, the method comprising the steps of:
- A) storing, in a storage unit, at least a first candidate sequence, wherein each candidate sequence represents a predetermined candidate estimated sequence {Xi(k)}, i=1 . . . N, where i is a positive integer and N represents a total number of stored candidate sequences;
- and
- B) providing, by an intersymbol interference canceller, a first modified received signal for each candidate sequence;
- and
- C) providing, by an interference suppresser, a second modified received signal for each candidate sequence;
- and
- D) utilizing a decision unit for estimating the sequence {X(k)}, based at least in part on the second modified received signals, and for storing said candidate sequence/sequences in the storage unit, and for outputting a final estimate for the signal point sequence.
A method for estimating a signal point sequence {X(k)}, from a received signal that is {X(k)} received in the presence of distortion and interference, the method comprising the steps of:
- A) providing, by an intersymbol interference canceller, a first modified received signal, wherein said first modified received signal is computed based on at least a first sample of the received signal using a distortion filter;
- B) storing, by a storage unit, at least a first candidate sequence, each candidate sequence representing a candidate estimated sequence {Xi(k)}, i=1 . . . N where i is a positive integer and N represents a total number of stored candidate sequences stored;
- and
- C) providing, by an interference suppresser, a second modified received signal for each candidate sequence;
- and
- D) utilizing the decision unit for estimating the sequence {X(k)}, based at least in part on the second modified received signal/signals, and for storing said candidate sequence/sequences in the storage unit, and for outputting a final estimate for the signal point sequence.
Dependencies are inferred from the claim text.