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Robust narrowband symbol and frame sychronizer for power-line communication

A symbol-synchronized, narrow-band signal technology used in communications

Active Publication Date: 2011-06-29
MAXIM INTEGRATED PROD INC
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  • Application Information

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Problems solved by technology

Synchronization detector detects symbol synchronization

Method used

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  • Robust narrowband symbol and frame sychronizer for power-line communication
  • Robust narrowband symbol and frame sychronizer for power-line communication
  • Robust narrowband symbol and frame sychronizer for power-line communication

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Embodiment Construction

[0050] A disclosed feature of an embodiment is a method and apparatus for performing symbol synchronization. A correlation estimator computes a correlation of a vector of samples representing a narrowband signal. A sync detector detects symbol sync. Another embodiment is a method and apparatus for performing frame synchronization. A Fast Fourier Transform (FFT) processing unit computes the current FFT vector and accumulated previous FFT vectors. The current FFT vector and the accumulated previous FFT vectors correspond to the sample vectors associated with the leading symbols. The real and imaginary processing unit uses the current FFT vector and the accumulated previous FFT vectors to generate real and imaginary sums. The mode processor uses the real and imaginary sums to generate a mode flag indicating the mode of operation.

[0051] A disclosed feature of an embodiment may be described as a process generally depicted as a flowchart, flowchart, block diagram or block dia...

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Abstract

An embodiment is a method and apparatus to perform symbol synchronization. A correlation estimator computes a correlation of a sample vector representative of a narrowband signal. A synchronization detector detects symbol synchronization. Another embodiment is a method and apparatus to perform frame synchronization. A Fast Fourier Transform (FFT) processing unit computes a current FFT vector and an accumulated previous FFT vector. The current FFT vector and the accumulated previous FFT vector correspond to sample vectors associated with preamble symbols. A real and imaginary processing unit generates real and imaginary summations using the current FFT vector and the accumulated previous FFT vector. A mode processor generates mode flags representing operational modes using the real and imaginary summations.

Description

[0001] related application [0002] This application claims the benefit of provisional application Serial No. 61 / 059718, filed June 6, 2008, entitled "ROBUST NARROWBAND SYMBOL SYNCHRONIZER FOR NARROWBAND COMMUNICATION." technical field [0003] Embodiments of the present disclosure are directed to the field of communications, and more particularly to power line communications. Background technique [0004] Power line communication (PLC) is a communication technology that carries data over a dielectric medium (such as wires) used for the transmission of electrical power. Typically, electrical power is transmitted over high voltage transmission lines, distributed over medium voltage, and used at low voltage within commercial or residential buildings. Since a powerline network transmits data signals over the same electrical grid used to carry electrical power to commercial or residential buildings, the electrical conductors and outlets are used for both electrical and data tra...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2675H04L27/2692H04L27/2627H04L27/2656H04L27/2662H04L27/0012
Inventor K·拉扎兹安M·乌马里V·V·洛吉诺夫
Owner MAXIM INTEGRATED PROD INC
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