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Timing estimation in an OFDM receiver

A timing estimation and fine-tuning technology, applied in the field of data communication, which can solve problems such as loss of network users, system performance degradation, loss of subcarrier orthogonality, etc.

Inactive Publication Date: 2012-07-04
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, a problem with OFDM systems is that they are particularly sensitive to receiver synchronization errors
This can cause degradation of system performance
In particular, the system may lose the orthogonality between the subcarriers and thus the network users

Method used

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  • Timing estimation in an OFDM receiver
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  • Timing estimation in an OFDM receiver

Examples

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Embodiment Construction

[0054] Various aspects and embodiments will now be described with reference to the drawings, wherein like numerals refer to like or corresponding elements throughout. It should be understood, however, that the drawings and detailed description herein are not intended to limit the embodiments to the particular form disclosed. On the contrary, the invention is to cover all modifications, equivalents and alternatives.

[0055] As used in this application, the terms "component" and "system" are intended to refer to a computer-related entity, either hardware, a combination of hardware and software, software or software in execution. For example, a component may be, but is not limited to being, a process executing on a processor, processor, object, executable, thread of execution, program, and / or computer (eg, desktop, portable, mini, palm). By way of example, both an application running on the computer and the device itself could be referred to as a component. One or more compone...

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PUM

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Abstract

A timing estimation system and methodology are provided. In particular, a first pilot is employed in conjunction with three acquisition stages. In the first stage, an attempt is made to observe the leading edge of the correlation curve associated with the first pilot symbol. In the second stage, a determination is made to confirm a leading edge was detected in the first stage by attempting to observe a trailing edge of the correlation curve. Furthermore, during this second stage, a frequency loop is updated to account for frequency offset. The third stage is for observing the trailing edge ofthe curve if it was not already observed in stage two. Upon detection of receipt of the first pilot, a second pilot can subsequently be employed to acquire fine symbol timing.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Application Serial No. 60 / 540,086, filed January 28, 2004, entitled "Improved Initial Timing Estimation in an OFDM Receiver." This application was submitted on December 22, 2004, the serial number is 11 / 020,413 (Agent filing number: 040134), and the name is "Frame Synchronization and Initial Symbol Timing Acquisition System and Method (Frame Synchronization and Initial Symbol Timing Acquisition System and Method)" It is also related to the U.S. application submitted on August 3, 2004, with the serial number 10 / 931,324 (Agent filing number: 030569), and the name is "Synchronization in a Broadcast OFDM System using Time Division Multiplexed Pilots (Using Time Division Multiplexed Pilot Signals Synchronization in broadcast OFDM systems)" is concerned. The entirety of the above application is hereby incorporated by reference. technical field [0003] The following descr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L5/06H04L27/06
CPCH04L5/06H04L27/2656H04L27/2662H04L27/2657H04L27/2655H04L27/2675H04L27/26H04L27/06
Inventor 阿洛克·库马尔·古普塔
Owner QUALCOMM INC