Lucent Technologies Inc.

National Semiconductor Corporation

Kumud Kumar Sanwal

Ahmad Reza Bahai

Hongwei Kong

Krishna Balachandran

Subramanian Vasudevan

Jialin Zou

Joseph H Kang

Henry Hui Ye

James Paul Seymour

Frank Gerhard Ernst Obernosterer

Yunsong Yang

In a method of canceling interference, a base station selects a known highest data rate user transmission from a received first signal containing a group of user transmissions. The known highest rate user transmission may be configured as one or more frames, each frame including a control preamble and a plurality of encoded sub-frames. The control preamble and encoded sub-frames may be decoded, and the decoded sub-frames may be used for removing interference caused by the known highest rate user transmission to all remaining transmissions of the group.

Method of interference cancellation in communication systems

A method of limiting at least one peak of a composite signal having multiple carriers signals involves placing energy in at least one bandwidth gap located between respective frequency bandwidths of carrier signals.

Device and method for reducing peaks of a composite signal

A wireless endpoint employs frequency hopping for communicating signals in a wireless communications system. Over a time period T, the wireless endpoint performs pseudo-random selection of a frequency from a hopping set of N frequencies such that over at least a portion of the time period T, the frequency selection is constrained to less than the N frequencies.

Enhanced frequency hopping in a wireless system

An efficient method of accurately estimating delay spread in multi-path transmission applications is based on quantifying the effect of the actual delay spread on the shape of the correlation energy profile between the received signal and the synchronization pattern of the receiver. Depending on the degree of the estimated delay spread, an appropriate demodulation technique is selected for optimizing the receiver performance over a range of channel multi-path conditions. The invention is applicable to digital wireless mobile communication systems, as well as to any device that performs characterization or testing of a transmission system.

Delay spread estimation for multipath fading channels

A method for adaptively equalizing an output of a digital communication channel, including steps of: generating an initial channel estimation; determining an initial set of metric states of a trellis, based on known symbols of a received input signal comprising a sequence of symbols; updating the set of metric states according to the initial channel estimation and the received signal; updating a set of paths for the metric states using a delayed tentative decision of a symbol of the received signal, to determine a set of survivor paths; and updating the channel estimation, based on the updated metrics, delayed tentative decision, and the received signal.

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Iselin, NJ, United States of America

Kumud Kumar Sanwal