Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-02-14
2006-02-14
Tran, Khai (Department: 2637)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S144000, C375S148000, C375S346000, C375S349000, C370S333000
Reexamination Certificate
active
06999501
ABSTRACT:
The method and device attenuate an interferer of substantially known spectrum in a communication signal which has been transmitted through a transmission channel and processed through a signal-processing receiver chain. In these method and device, the substantially known spectrum is used to generate, independently of the communication signal, at least one image representative of a replica of the interferer after processing through the signal-processing receiver chain. The generated image is subtracted from the processed communication signal to produce a subtraction signal, and quality-indicative parameters of the processed communication signal and the subtraction signal(s) are calculated. Finally, the quality-indicative parameters are used to select one of the processed communication signal and subtraction signal(s) for further processing through the receiver. When a plurality of images are generated, these images have different features, for instance different amplitudes or phases. At least one image can be feedback controlled in relation to the quality-indicative parameter of the subtraction signal corresponding to this image, in view of improving the quality-indicative parameter of this subtraction signal. This feedback control can also be responsive to the signal selection to improve the quality-indicative parameter of the subtraction signal until the latter signal is selected for further processing through the receiver.
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Paul Dent et al.,CDMA-IC: A novel code division multiple access scheme based on interference cancellation,IEEE, 1992.
Chang Edith
Sandra Beauchesne, Ericsson Canada Inc.
Telefonaktiebolaget LM Ericsson (Publ)
Tran Khai
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