Sun Management, LLC

Ikanos Communications, Inc.

Centillium Communications, Inc.

XiangGuo Tang

Guozhu Long

Amir H Fazlollahi

Jun Shen

Techniques to select an antenna from a plurality of antennae used for wireless communications are described. A first embodiment of the techniques is a method to select an antenna from a plurality of antennae. The method includes monitoring at least one antenna during a fraction of at least one preamble period of a frame to derive at least one quality indicator corresponding to the antenna; storing the quality indicator derived from monitoring the antenna during the fraction of the preamble period of a frame; and selectively switching to a selected antenna after a number of frames, based on the quality indicator. A second embodiment is another method to select an antenna from a plurality of antennae. These embodiments can be applied in several wireless communication applications using multiple antennae.

Antenna selection scheme for multiple antennae

Techniques to generate synchronization information from received signals in communication applications are disclosed. According to one embodiment, a method for generating synchronization information from received signals includes providing a fixed gain to a received analog signal to generate a modified analog signal, converting the modified analog signal to a digital signal, extracting one or more sign bits from the digital signal, and generating synchronization information as a function of the one or more sign bits. Various embodiments can be applied in several wireless and wired communication applications.

Method and apparatus for processing received signals for synchronization in communication devices

To reduce the ISDN crosstalk in an incoming DSL signal, a crosstalk canceller observes at least a portion of the crosstalk signal and reproduces an estimate of the crosstalk signal for at least a portion of that signal within the DSL band. The crosstalk canceller applies a canceling signal based on the estimated crosstalk signal to reduce the crosstalk in the received DSL signal.

ISDN crosstalk cancellation in a DSL system

An echo cancellation (EC) system for use in a full-duplex communication system having asymmetric signal sampling rates, in particular an ADSL system, is described. The system performs the cancellation of local echo signal in digital or analog domain depending on the loop condition using a switching logic. The EC system further includes an EC unit that generates a digital echo estimate signal at the lower sampling rate of the transmitted signal and then interpolates the digital signal to higher sampling rate to cancel echo signal thereby reducing computation complexity. The digital interpolated echo estimate signal is converted to analog form for use in analog echo cancellation. The subtracted signal resulting from the analog echo cancellation is converted into digital domain and used as feedback for the EC unit to adaptively improve the accuracy of the echo estimate.

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Union City, CA, United States of America

XiangGuo Tang