OFDM channel estimation system and method components

a channel estimation and component technology, applied in the field of channel estimation system and method components, can solve problems such as data decoding errors, and achieve the effect of efficient use of memory and power

Inactive Publication Date: 2008-04-24
ANALOG DEVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]It is a further object of this invention to provide such improved OFDM est

Problems solved by technology

Such variations referred to as inter-carrier or inter-channel interference (ICI) noise interferes with the orthogonality

Method used

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  • OFDM channel estimation system and method components
  • OFDM channel estimation system and method components
  • OFDM channel estimation system and method components

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Embodiment Construction

[0045]Aside from the preferred embodiment or embodiments disclosed below, this invention is capable of other embodiments and of being practiced or being carried out in various ways. Thus, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of components set forth in the following description or illustrated in the drawings. If only one embodiment is described herein, the claims hereof are not to be limited to that embodiment. Moreover, the claims hereof are not to be read restrictively unless there is clear and convincing evidence manifesting a certain exclusion, restriction, or disclaimer.

[0046]There is shown in FIG. 1 an OFDM symbol stream 10 including two symbols 12 and 14 each of which includes a cyclical prefix section 16 and carrier data section 18. Each carrier data section 18, FIG. 2, includes a plurality of carrier data a0, a1, a2, a3- - - - an-1, an where the filled circles represent pilot carrier d...

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Abstract

Channel estimation for high mobility OFDM channels is achieved by identifying a set of channel path delays from an OFDM symbol stream including carrier data, inter-channel interference noise and channel noise; determining the average channel impulse response for the identified set of channel path delays in each symbol; generating a path delay curvature for each channel path delay in each symbol based on stored average channel impulse responses for the identified channel path delays; estimating the carrier data in the symbols in the OFDM symbol stream in the presence of inter-channel interference noise and channel noise from the OFDM symbol steam and the average impulse responses for the identified channel path delays; reconstructing the inter-channel interference noise in response to the path delay curvature, the identified set of channel path delays and estimated carrier data to produce a symbol stream of carrier data and channel noise with suppressed inter-channel interference noise.

Description

RELATED APPLICATIONS[0001]This application is a continuation-in-part of U.S. patent application Ser. No. 11 / 789,180 filed Apr. 24, 2007 which claims benefit of and priority to U.S. Provisional Application Ser. No. 60 / 852,607 filed Oct. 18, 2006 each of which are incorporated herein by this reference.FIELD OF THE INVENTION[0002]This invention relates to channel estimator system and method components for high mobility OFDM channels.BACKGROUND OF THE INVENTION[0003]Binary phase shift keying (BPSK) is a conventional data modulation scheme that conveys data by changing, the phase of a reference carrier signal, for example, during each BPSK symbol period carrier data in the form of either a positive or negative sine wave is transmitted. A positive sine wave represents a data “1”, a negative sine wave a data “0”. When the symbol stream arrives at the receiver it is decoded by multiplying with a positive sine wave. The multiplying of it by another positive sine wave produces a average posit...

Claims

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Application Information

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IPC IPC(8): H04K1/10
CPCH04L25/0218H04L25/0228H04L25/025H04L25/03038H04B17/364H04L27/2647H04L2025/03414H04L2025/03783H04B17/345H04L25/03159H04L25/0204H04L25/0212H04L27/01
Inventor PRIMO, HAIMSTEIN, YOSEFAN, WEI
Owner ANALOG DEVICES INC
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