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Blind Channel Equalizers and Methods of Blind Channel Equalization

Equalization is always necessary in wireless communication to remove or alleviate signal contamination during transmission. Blind Channel Equalization is a signal equalization technique, which does not require prior characterization of the transmission channel as a pre-requisite for satisfactory signal recovery.

This invention provides novel blind equalizers and methods for blind equalization for wireless communication. Signal equalization is achieved by devising a characteristic system convolution matrix and algebraically operating on the matrix by equalizing functions generated from SOS of the received signals. Such equalization is done with an aim of removing or suppressing inter-symbol interference elements from the received signals to enable satisfactory signal recovery. The invention allows systems and receivers have benefits of retaining the speed and processing power efficiency of equalization algorithms based on SOS while substantially insensitive to the accuracy of channel order estimates.

Despite that known blind channel-equalization algorithms are typically based on second order statistics (SOS) of the received signals, the performance of SOS based equalizing algorithms usually rely critically on channel diversity. This is achieved either by antenna diversity or by over-sampling of output signals when the channels have excess bandwidth. In addition, their sensitivity varies in channel order estimate and hence accurate channel estimate is difficult to achieve. Poor blind channel identification will inevitably result unless there is an accurate channel order estimate.
Technology Benefits
1. The implementation is simple and the system is reliable
2. Requires little prior information
3. Not sensitive to channel order estimation
4. Solves the direct blind equalization problem
Technology Application
- Wireless communication systems
- Immediately applicable in GSM and TDMA systems
- Multi-user wireless systems
Supplementary Information
Patent Number: US6463099B1
Application Number: US1999313817A
Inventor: Cao, Xiren | Ding, Zhi | Zhu, Jie
Priority Date: 18 May 1999
Priority Number: US6463099B1
Application Date: 18 May 1999
Publication Date: 8 Oct 2002
IPC Current: G06F001715 | H04L002503
US Class: 375232 | 708322
Assignee Applicant: The Hong Kong University of Science & Technology
Title: Blind channel equalizers and methods of blind channel equalization
Usefulness: Blind channel equalizers and methods of blind channel equalization
Summary: For performing signal equalization in multiple-input, multiple-output wireless communication system (claimed).
Novelty: Signal equalization in multi-input, multi-output wireless communication system, involves operating convolution matrix algebraically by equalizing functions generated from second order statistics of channel output signals
Sub Category
Application Date
18 May 1999
Application No.
US 09/313817
Patent Information
US 6463099
ID No.
Hong Kong

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