Rake receiver with multi-path interference accommodation

a receiver and multi-path technology, applied in the field of multi-path cancellation in wireless communication, can solve the problems of serious communication channel impairment, undesired phenomenon,

Inactive Publication Date: 2006-05-18
QUALCOMM INC
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  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0002] Multi-path interference is an undesired phenomenon characteristic in the wireless communication field. In certain cases, it can produce serious communication channel impairment. It is characteristic to dense urban areas and confined areas such as shopping malls. One form of multi-path interference cancellation (MPIC) is suggested...

Problems solved by technology

Multi-path interference is an undesired phenomenon characteristic in the wireless communication field.
In certain cases, it can produce serious communication channel impairment.

Method used

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  • Rake receiver with multi-path interference accommodation
  • Rake receiver with multi-path interference accommodation

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Embodiment Construction

[0007]FIG. 1 illustrates a generic representation of a rake receiver. The elements are well known and not described herein in detail. Only those elements or functional portions which are used in the present method are illustrated. The rake receiver 10 includes a rake searcher 12 and a channel estimator 14 providing path delay estimations τ1, τ2 . . . τ3 and estimates to the channel coefficients c1, c2 . . . c3 to the main processing portion 16. The main processing portion 16 includes a multi-path interference cancellation (MPIC) portion and a Maximum Ratio Combiner (MRC) portion. Depending upon the structure, these may be hardware or software routines. As described herein, the MPIC is performed in software and achieves multi-path interference cancellation or accommodation by representing the received filtered signal with a linear equation and extracting the transmitted data from the filtered sample for each path by a solution of simultaneous equations of the filtered sample equation...

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Abstract

A method of extracting data from a received signal including multi-path interference in a rake receiver. The method includes sampling and filtering the received signal; estimating a time delay (a) between paths for the filtered samples Ψ(τ); and estimating channel complex coefficient (b) for the filtered samples Ψ(τ). Transmitted data x(τl) is extracted from the filtered samples Ψ(τ) for each path l by solutions of simultaneous equations of the following filtered samples Ψ(τ) equation (Formula I) wherein k is a particular path, Np is the number of visible paths, (c) is a a double convolution matrix of the filtering process and (d) is the pseudo inverse, Ass (τl)is the product of spreading and scrambling matrices and (e) is the inverse, and (f) is noise.

Description

BACKGROUND AND SUMMARY [0001] The present disclosure is directed to multi-path cancellation in wireless communication and more specifically to accommodating for the multi-path interference. [0002] Multi-path interference is an undesired phenomenon characteristic in the wireless communication field. In certain cases, it can produce serious communication channel impairment. It is characteristic to dense urban areas and confined areas such as shopping malls. One form of multi-path interference cancellation (MPIC) is suggested in “Channel Tracking for Rake Receivers in Closely Spaced Multipath Environments,” Fock et al., IEEE Journal on Selected Areas in Communications, vol. 19, no. 12, pp. 2420-31, December 2001. It uses fading coefficients and relative delays to compute a compensation term that allows cancellation of the effect of other paths on the timing error. [0003] The present method extracts data from a received signal including multi-path interference in a rake receiver. The me...

Claims

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Application Information

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IPC IPC(8): H04B1/707
CPCH04B1/7107H04B1/7115H04B1/7117H04B1/712
Inventor IANCU, DANIELGLOSSNER, JOHNMOUDGILL, MAYAN
Owner QUALCOMM INC
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