Iterative Interference Cancellation Using Mixed Feedback Weights and Stabilizing Step Sizes

a technology of mixed feedback and interference cancellation, applied in the direction of electrical equipment, digital transmission, baseband systems, etc., can solve the problems of increasing the error floor of the receiver, subchannel leakage into other subchannels, and interference types

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a technology of mixed feedback and interference cancellation, applied in the direction of electrical equipment, digital transmission, baseband systems, etc., can solve the problems of increasing the error floor of the receiver, subchannel leakage into other subchannels, and interference types

US20100208774A1Inactive Publication Date: 2010-08-19III HLDG 1

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[0047]The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0048]First the invention will be described as it applies to a forward-link channel, and then extended to include reverse-link channels. The following formula represents an analog baseband signal received at a mobile from multiple base stations, each with its own multipath channel,

Equation1y(t)=∑s=0B-1∑l=0L(s)α(s),l∑k=0K(s)-1b(s),ku(s),k(t-τ(s),l)+w(t),t∈(o,T),

with the following definitions[0049](0,T) is the symbol interval;[0050]B is the number of modeled base stations and is indexed by the subscript (...

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Abstract

A receiver is configured for canceling intra-cell and inter-cell interference in coded, multiple-access, spread-spectrum transmissions that propagate through frequency-selective communication channels. The receiver employs iterative symbol-estimate weighting, subtractive cancellation with a stabilizing step-size, and mixed-decision symbol estimates. Receiver embodiments may be implemented explicitly in software or programmed hardware, or implicitly in standard Rake-based hardware either within the Rake (i.e., at the finger level) or outside the Rake (i.e., at the user or sub channel symbol level).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to U.S. patent application Ser. No. 11 / 451,932, filed Jun. 13, 2006, which claims priority to U.S. Patent Application No. 60 / 736,204, filed Nov. 15, 2005, both entitled “Iterative Interference Cancellation Using Mixed Feedback Weights and Stabilizing Step Sizes,” and each of which is incorporated by reference in its entirety.BACKGROUND[0002]1. Field of the Invention[0003]The present invention relates generally to iterative interference cancellation in received wireless communication signals and, more particularly, to cancellation of intra-cell interference and / or inter-cell interference in coded spread spectrum communication systems.[0004]2. Discussion of the Related Art[0005]In an exemplary wireless multiple-access system, a communication resource is divided into code-space subchannels that are allocated to different users. A plurality of sub channel signals received by a wireless terminal (e.g., a subscr...

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Application Information

Patent Timeline

19 Aug 2010

Publication

US20100208774A1

IPC: H04B1/707

CPC: H04B1/7107; H04B1/71072; H04B1/71075; H04L2025/03375; H04B1/712; H04L25/03006; H04B1/7115

Inventors: GUESS, TOMMY; MCCLOUD, MICHAEL L.