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Coherent initial acquisition

A technology of acquisition device and correlator, which is applied in the field of telecommunications, can solve the problems of lack of signal and tone interference distinction, estimation of initial frequency offset, tone interference effect, etc.

Inactive Publication Date: 2014-02-19
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method lacks the ability to distinguish signal from tone interference well
Furthermore, the estimate of the initial frequency offset can be significantly affected by the presence of tonal disturbances

Method used

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  • Coherent initial acquisition
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Embodiment Construction

[0019] The detailed description set forth below in conjunction with the accompanying drawings is intended as an illustration of various configurations of the invention and is not intended to represent the only configurations in which the invention can be practiced. The detailed description includes specific details in order to provide a thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring the concepts of the invention.

[0020] The concepts described in this disclosure may be used in various wireless telecommunications systems, including cellular systems, broadcast systems, wireless local area networks (WLANs), and others. Many concepts will be described in the context of telecommunications systems using OFDM techniques, but the concepts are eq...

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Abstract

An acquisition module includes a coherent correlator configured to receive a transmission having a pilot signal and correlate the received transmission with a local copy of the pilot signal to produce a first output, a delayed correlator configured to delay the first output and correlate the first output with the delayed first output to produce a second output, and a detector configured to detect the pilot signal in the transmission based on the second output.

Description

[0001] Claim priority under 35U.S.C.119 [0002] This application for patent claims priority to Provisional Application 60 / 893,105, filed March 5, 2007, entitled "COHERENTINITIAL ACQUISITION," which is assigned to the assignee of this application and is hereby incorporated by reference in its entirety It is expressly incorporated herein. technical field [0003] The present disclosure relates generally to telecommunications, and more specifically to coherent initial acquisition of pilot signals. Background technique [0004] Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier modulation technique that effectively divides the overall system bandwidth into a large number of subcarriers. These subcarriers are separated at precise frequencies to provide orthogonality. Content can be modulated onto the subcarriers by adjusting the phase, amplitude, or both of each subcarrier. Any suitable existing modulation scheme may be used, such as Phase Shift Keying (QPSK)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L27/227
CPCH04L5/0007H04L27/2675H04L27/261H04L27/2655H04L5/0048H04L27/227H04L27/26
Inventor R·克里希纳穆尔蒂T·田凌复云Y·黄
Owner QUALCOMM INC