Method and apparatus for signal transmission and reception

a signal transmission and reception technology, applied in the field of signal transmission and reception systems, can solve the problem that prior art modems employing modulation schemes such as qam cannot employ non-linear amplification, and achieve the effects of reducing bandwidth, reducing cost and complexity, and being easy to implemen

Inactive Publication Date: 2005-06-30
INTRATECH
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  • Abstract
  • Description
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  • Application Information

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Benefits of technology

[0018] FM double-side band is employed in systems requiring minimal cost and complexity. FM single-side band is easily implemente

Problems solved by technology

Prior art modems employing modulation schemes such

Method used

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  • Method and apparatus for signal transmission and reception
  • Method and apparatus for signal transmission and reception
  • Method and apparatus for signal transmission and reception

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Embodiment Construction

[0040] Referring now to FIG. 1 a signal decomposition-recomposition system 10 includes an analyzer 12 having an input port 14a and a pair of output ports 16a, 16b. Each of the output ports 16a, 16b are coupled to a corresponding pair of input ports 18a, 18b of a synthesizer 20.

[0041] An analog input signal X fed to the analyzer input port 14a is decomposed into a pair of signals W′ and V′ each of which is fed to a corresponding one of the output ports 16a, 16b. Similarly, a pair of input signals W′, V′ fed to the synthesizer input ports 18a, 18b are reconstructed in to an output signal Y at a synthesizer output port 22a. The decomposition and reconstruction processes performed by the analyzer 12 and the synthesizer 20 as well as the signals V′ and W′ will be described further hereinbelow. Suffice it here to say that the input signal X is decomposed into the signals V′ and W′ such that the signals V′ and W′ may later be combined to exactly reconstruct the input signal X.

[0042] It s...

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Abstract

A method and modem for communicating serial input data over a transmission link. Serial input data is partitioned into parallel data elements prior to rotation by an invertible linear mapping. Resulting frames of parallel signal elements sequentially modulate a carrier, which is then transmitted over the link. After receipt of the modulated carrier from the link, the signal is demodulated and assembled into frames of parallel signal elements which are de-rotated by an inverse linear mapping. Thresholding the result of the inverse mapping recovers the parallel data elements, which are then re-assembled into serial output data. The linear mapping employs: 1) commuting rotation matrices for convolutionally rotating data vectors into signal vectors and vice-versa; 2) filter bank polyphase rotation matrices; or 3) computationally efficient multi-rate wavelet filter banks. Transmitter pre-emphasis places most of the information in lower baseband frequencies; complimentary de-emphasis occurs in the receiver. Logarithmic amplification of the baseband signal prior to carrier modulation improves modulation gain and transmit channel noise attenuation. Coefficients of the rotation matrix of the receiver are adaptively equalized to correct for transmission path distortion. FM double-side band is employed in systems requiring minimized cost and complexity. FM single-side band is employed in systems in which bandwidth reduction is desirable. AM is also employable.

Description

RELATED APPLICATIONS [0001] This application is a continuation-in-part of application Ser. No. 08 / 342,259, filed Nov. 18, 1994 (Attorney Docket MILL-001 AX), which is a continuation of U.S. Pat. No. 5,367,516, filed Mar. 17, 1993, issued Nov. 22, 1994 (Attorney Docket MILL-001XX).FIELD OF THE INVENTION [0002] This invention relates to signal transmitting and receiving systems and more particularly to modems employing polyphase filtering techniques. BACKGROUND OF THE INVENTION [0003] As is known in the art, a modulator-demodulator (modem) is an electronic device that modulates transmitted signals and demodulates received signals. The modem generally provides an interface between digital devices and an analog communications system to thus make possible analog transmission of digital information between two terminals or stations. Such transmissions may be over a transmission link such as a telephone line, cellular communication link, satellite link, and cable TV, each of which being ge...

Claims

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Application Information

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IPC IPC(8): H04K1/02H04L25/03H04L69/40
CPCH04K1/02H04L69/40H04L25/03343
Inventor MILLER, WILLIAM J.
Owner INTRATECH
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