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Method and apparatus for iteratively calculating channel response estimates

A channel response and channel estimation technology, applied in baseband systems, digital transmission systems, electrical components, etc., can solve problems affecting the channel response estimation process and achieve the effect of improving accuracy and reliability

Inactive Publication Date: 2009-09-02
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, signal impairments affect the channel response estimation process, especially when the impairments are severe
Therefore, impairment correlation estimation and channel response estimation may be interdependent, especially when the interference is severe

Method used

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  • Method and apparatus for iteratively calculating channel response estimates
  • Method and apparatus for iteratively calculating channel response estimates
  • Method and apparatus for iteratively calculating channel response estimates

Examples

Experimental program
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Embodiment Construction

[0012] figure 1 Embodiments of a wireless communication device 10 such as a base station, cellular telephone or other mobile communication terminal or device are illustrated. Wireless communication device 10 has one or more antennas 12 , front-end circuitry 14 , baseband processor 16 and post-processor 18 . Antenna(s) 12 receive signal energy propagating through one or more multipath fading channels and filter down-convert the received signal with front-end circuitry 14 to produce a corresponding baseband signal (r s ). Signal energy received by antenna(s) 12 has propagated to wireless communication device 10, possibly through a downlink communication channel or through an uplink communication channel such as a Wideband Code Division Multiple Access (W-CDMA) DPCCH channel. Regardless, a baseband processor 16, such as a G-RAKE receiver or a chip equalizer, generates soft bit values ​​(sbv) or sign estimates based on the baseband signal. Post-processor 18 performs other signa...

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PUM

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Abstract

Channel response and impairment correlation estimates are iteratively determined. According to one embodiment of performing channel estimation for use in received signal processing, a channel responseestimate is calculated based on an initial impairment correlations estimate and a measured channel response derived from a received signal. A revised impairment correlations estimate is calculated using a parametric approach based on the channel response estimate and the channel response estimate is recalculated based on the revised impairment correlations estimate. According to one embodiment ofa wireless communication device, the device comprises a parameter estimation unit configured to iteratively calculate a medium channel response estimate based on a parametric impairment correlationsestimate and a measured net channel response derived from a received signal. The wireless communication device also comprises circuitry configured to control how many times the parameter estimation unit calculates the medium channel response estimate.

Description

technical field [0001] The present invention relates generally to wireless communication devices, and more particularly to iteratively computing channel response estimates for use in received signal processing. Background technique [0002] Signals transmitted in wireless communication systems, such as Code Division Multiple Access (CDMA) or Wideband CDMA (WCDMA) systems, are affected by various sources of interference and noise as they propagate through radio channels. Interference and noise components that affect signal transmission and reception in wireless communication systems are broadly referred to as impairments. Certain types of injury may be associated. That is, two seemingly independent signal impairments may in fact be related, and thus be said to be correlated. Some conventional receiver types, such as the Generalized RAKE (G-RAKE) receiver and its Chip Equalizer (CEQ) counterpart use impairment related knowledge to improve received signal processing. G-RAKE ...

Claims

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Application Information

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IPC IPC(8): H04B1/707H04L25/02
CPCH04L25/0242H04B2201/709727H04B1/712H04L25/0228
Inventor G·博托姆利C·科佐
Owner TELEFON AB LM ERICSSON (PUBL)