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Frequency Domain Interference Cancellation and Equalization for Downlink Cellular Systems

An interference cancellation, frequency domain technology, applied in baseband systems, transmission systems, digital transmission systems, etc., can solve problems such as high implementation complexity and power consumption

Inactive Publication Date: 2018-01-12
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Typically, each of these operations is performed in the time domain, and these operations have many multiplications, resulting in high implementation complexity and power consumption

Method used

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  • Frequency Domain Interference Cancellation and Equalization for Downlink Cellular Systems
  • Frequency Domain Interference Cancellation and Equalization for Downlink Cellular Systems
  • Frequency Domain Interference Cancellation and Equalization for Downlink Cellular Systems

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Embodiment Construction

[0020] Various aspects are now described with reference to the figures. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more aspects. It can be evident, however, that these aspects can be practiced without the use of these specific details.

[0021] The apparatus and methods described herein are configured to reduce the complexity and power consumption associated with interference cancellation by using an interference cancellation structure that performs signal equalization, reconstruction, and interference cancellation in the frequency domain. Once a signal is transformed from the time domain to the frequency domain, it is then kept in the frequency domain between successive processing iterations. The interference estimate is transformed to the frequency domain, where interference cancellation is performed.

[0022] figure 1 An example of a communication system in whic...

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Abstract

The present invention describes methods and devices for interference cancellation of interference components of time domain signals in the frequency domain. The communication device receives the time domain sequence and generates overlapping time domain segments from the time domain sequence. These overlapping time domain segments are then transformed into the frequency domain to generate frequency domain representations of the overlapping time domain segments. These frequency domain representations are stored in a residual memory, and in the frequency domain the interfering components are directly removed from the frequency domain representations stored in the residual memory.

Description

[0001] Claiming Priority Based on 35 U.S.C. §119 [0002] This patent application claims priority to Provisional Application No. 61 / 586,917, filed January 16, 2012, entitled "Frequency DomainInterference Cancellation and Equalization for Downlink Cellular Systems," which is assigned to the assignee of this application person, it is hereby expressly incorporated by reference. [0003] References to Co-Pending Patent Applications [0004] This patent application is related to the following co-pending U.S. patent applications: [0005] The U.S. Patent Application No. 111764 and titled "Intercell Frequency Offset Compensation for Frequency Domain Interference Cancellation for Downlink Cellular Systems" filed at the same time as this application has been assigned to the assignee of this application, so it is expressly It is incorporated herein by reference. Background technique [0006] The present application relates generally to interference cancellation, and more particularly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03
CPCH04L25/03159
Inventor R·卡恩S·H·徐
Owner QUALCOMM INC