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Transmitted-reference-spread-spectrum-communications-system

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Transmitted reference spread spectrum communications system

Details

Inventors: Ross, John Anderson Fergus; Ali, Irfan; Hershey, John Erik; Hladik, Stephen Michael; Saulnier, Gary Jude; Weir, Michael Paul;
Assignee: General Electric Company (Schenectady, NY)
Primary Examiner: Tse; Young T.
Assistant Examiner:
Attorney, Agent or Firm: Snyder; Marvin

A low complexity and low cost transmitted reference spread spectrum communications system provides several methods of generating a suitable wideband carrier, a method for combining the wideband carrier with a narrowband modulated wideband carrier, and a number of implementations of a simple, inexpensive receiver for the transmitted reference communications system. The transmitter includes a balanced modulator for modulating a wideband spreading signal with a narrowband message signal to generate a wideband carrier. A signal combiner combines the wideband carrier with a narrowband modulated wideband carrier to generate a transmitted reference spread spectrum signal. The receiver includes a selectable time delay device having a plurality of taps for receiving a detected received signal from the transmitter. A tap selector selects a delayed signal from the selectable time delay device. A mixer combines output signals of the selectable time delay device and the tap selector, and a leaky integrator receives the mixer output signal and controls the tap selector. The leaky detector generates the narrowband message signal.

DETAILED DESCRIPTION One object of the invention is to provide a simple and inexpensive method and apparatus for effecting spread spectrum communications.
According to the invention, there are provided several methods of generating a suitable wideband carrier, a method for combining the wideband carrier with the narrowband modulated wideband carrier, and a number of implementations of a simple, inexpensive receiver for the transmitted reference system.

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