Method and apparatus for receiving and decoding communication signals in a CDMA receiver
AssigneeMotorola, Inc.
InventorEdward K. B. Lee
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Abstract
In an adaptive CDMA receiver (20), a DS-SS received signal and a reference signal are equalized by minimizing the error between them the received signal includes a desired DS-SS communication signal comprising binary bits coded with spreading chip sequences. The received signal is sampled at a chip rate to produce sampled received signals which are correlated with each other. The received samples are de-correlated by employing an orthogonal transformation algorithm to provide de-correlated elements corresponding to the received samples. The equalization process is accelerated by minimizing the error based on the de-correlated elements.
Claims11
In a code division multiple access (CDMA) receiver which utilizes adaptive equalization for minimizing the error between a received DS-SS signal and a reference signal;
- a method for decoding the received signal comprising the steps of:
- a) receiving a DS-SS communication signal including a desired DS-SS signal, wherein said desired DS-SS signal comprises binary bits coded with a spreading chip sequence;
- b) sampling during a bit interval said received DS-SS communication signal to produce received samples, said received samples being correlated with each other;
- c) de-correlating the received samples by employing an orthogonal transformation algorithm to provide de-correlated elements corresponding to said received samples;
- and
- d) minimizing the error based on the de-correlated elements.
An adaptive code division multiple access (CDMA) receiver which utilize adaptive equalization by minimizing the error between a received DS-SS communication signal and a reference signal comprising:
- means for receiving the DS-SS communication signal, said DS-SS communication signal including a desired DS-SS signal, wherein said desired DSSS signal comprises binary bits coded with spreading chip sequences
- a tapped delay line equalizer comprising:
- sampling means for sampling, during a bit interval, said received DS-SS communication signal to produce received samples, said received samples being correlated with each other;
- de-correlation means for de-correlating the received samples by employing an orthogonal transformation algorithm to provide de-correlated elements corresponding to said received samples
- error minimization means responsive to said de-correlated elements for minimizing the error between the reference signal and the received DS-SS communication signal.
Dependencies are inferred from the claim text.