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Frame synchronization and initial symbol timing acquisition system and method

A symbol and initial frame technology, applied in the field of data communication, can solve problems such as loss of subcarrier orthogonality, system performance degradation, receiver synchronization error sensitivity, etc.

Inactive Publication Date: 2007-09-05
QUALCOMM INC
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AI Technical Summary

Problems solved by technology

However, a known problem with such conventional systems is that multipath delay spread causes interference between multiple users
[0009] However, a problem with OFDM systems is that they are particularly sensitive to receiver synchronization errors
This may cause a decrease in system performance
In particular, the system may lose orthogonality between subcarriers, and thus between network users

Method used

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  • Frame synchronization and initial symbol timing acquisition system and method
  • Frame synchronization and initial symbol timing acquisition system and method
  • Frame synchronization and initial symbol timing acquisition system and method

Examples

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Embodiment Construction

[0049] Various aspects and embodiments will now be described with reference to the accompanying drawings, where the same reference numerals refer to the same or corresponding elements throughout the text. However, it should be understood that the drawings and further detailed description are not intended to limit the embodiments to the specific forms disclosed. More appropriately, the purpose is to cover all modifications, equivalents, and alternatives.

[0050] As used in this application, the terms "component" and "system" mean computer-related entities, which are hardware, a combination of software and hardware, software, or software in execution. For example, a component may be a process, a processor, an object, an executable program, an execution thread, a program, and / or a computer (for example, a desktop computer, a portable computer, a pocket computer, a palmtop computer, etc.) running on a processor, but Not limited to this. By way of example, both the application running...

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Abstract

A robust initial frame detection and symbol synchronization 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 as to whether a leading edge was detected in the first stage by attempting to observe a flat portion and / or trailing edge of the correlation curve. Furthermore, during this second stage, a frequency loop can be updated to account for frequency offset. The third stage is for observing the trailing edge of the curve if it was not already observed in stage two. Upon detection and confirmation 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 requires the rights of U.S. Provisional Application No. 60 / 540,089 filed on January 28, 2004, entitled "A Procedure to Acquire Frame Synchronization and Initial OFDM Symbol Timing from the Detection of TDM Pilot". This application also relates to US application No. 10 / 931,324 (Attorney Docket No. 030569) filed on August 3, 2004, entitled "Synchronization in a Broadcast OFDM System using Time Division Multiplexed Pilots". The entire content of the aforementioned application is incorporated herein by reference. Technical field [0003] The following description generally relates to data communication, and more specifically, to signal acquisition and synchronization. Background technique [0004] The demand for high-capacity and reliable communication systems is increasing. Today, data services mainly come from mobile phones and desktop or portable computers. With the passage of time and the development of tech...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2662H04L27/2657H04L27/2675H04L27/2656H04L27/26H04L7/10H04L27/06
Inventor 阿洛克库马尔·古普塔
Owner QUALCOMM INC
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