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Channel estimation for a communication system using spectral estimation

A technology for communication channel and channel estimation, which is applied in the field of channel estimation and can solve problems such as poor performance

Active Publication Date: 2007-03-28
QUALCOMM INC
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Problems solved by technology

This coarse channel estimate may provide poor performance if the receiver uses it to resume data transmission

Method used

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  • Channel estimation for a communication system using spectral estimation
  • Channel estimation for a communication system using spectral estimation
  • Channel estimation for a communication system using spectral estimation

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Embodiment Construction

[0019] The word "exemplary" may be used herein to mean "serving as an example, instance, or illustration." Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or superior to other embodiments or designs.

[0020] The channel estimation techniques described herein can be used in various wireless and wireline multi-carrier communication systems. Multiple carriers may be obtained by Orthogonal Frequency Division Multiplexing (OFDM), Discrete Multi-Tone (DMT), some other multi-carrier modulation technique, or some other construction. OFDM effectively partitions the overall system bandwidth into a number (N) of orthogonal subbands, also known as tones, subcarriers, bins, and channels. With OFDM, each subband is associated with a respective subcarrier on which data can be modulated.

[0021] For clarity, channel estimation techniques are described below for OFDM based wireless systems. One such system is an Orthogonal Frequency...

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Abstract

Techniques for performing channel estimation in a multi-carrier system are described. A frequency response estimate is initially obtained for a wireless channel based on a narrowband pilot sent on different sets of subbands in different symbol periods or a wideband pilot sent on all or most subbands in the system. Spectral estimation is performed on the frequency response estimate to determine at least one frequency component of the frequency channel estimate, with each frequency component being indicative of a delay for a channel tap in an impulse response estimate for the wireless channel. A channel estimate for the wireless channel is then obtained based on the frequency component(s) determined by the spectral estimation. This channel estimate may be a channel profile, the impulse response estimate, an improved frequency response estimate, a signal arrival time, or some other pertinent information regarding the wireless channel.

Description

[0001] Claim priority under 35 U.S.C § 119 [0002] This patent application claims priority to Provisional Application No. 60 / 540,088, filed January 28, 2004, entitled "TIME-SYNCHRONIZATION AND CHANNEL SOUNDING USINGSPECTRAL ESTIMATION," which The application is assigned to the assignee of the present application, thereby specifically citing this provisional application by reference herein. technical field [0003] The present invention relates generally to communications, and more particularly to channel estimation for communications systems. Background technique [0004] In a wireless communication system, a radio frequency (RF) modulated signal may be transmitted from a transmitter to a receiver via several signal paths. If the signal paths have different delays, the received signal at the receiver will include multiple instances of the transmitted signal at different gains and delays. This time dispersion in the wireless channel causes frequency selective fading, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
CPCH04L27/2647H04L25/0224H04L25/0248H04L25/0202
Inventor 阿尔温德·维贾伊·基尔蒂
Owner QUALCOMM INC
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