Method and apparatus for receive channel noise suppression

A noise suppression and receiver technology, applied in the transmission system, electrical components, etc., can solve the problems of identification and suppression, thermal noise is difficult to identify and suppress, and achieve the effect of improving the signal-to-noise ratio

Inactive Publication Date: 2004-04-28
INTERWAVE COMM
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thermal noise is inherent in electronic devices and is generated by the random movement of electrons within or between electrical components, making thermal noise difficult to identify and suppress
To date, conventional RF receivers have not provided effective techniques for identifying and suppressing such noise

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for receive channel noise suppression
  • Method and apparatus for receive channel noise suppression
  • Method and apparatus for receive channel noise suppression

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Exemplary embodiments are described below with reference to specific structures, configurations, and designs. Those skilled in the art will appreciate that various changes and modifications can be made to these embodiments while remaining within the scope of the present invention. For example, although the exemplary embodiments refer to radio receivers, the invention may be used with any type of receiver.

[0025] FIG. 1 shows a radio receiver with a noise suppression device 5 according to the invention. The antenna 10 receives an input signal, which contains a desired signal, but the desired signal may be distorted by externally generated noise, such as background radiation and path loss during propagation. The input signal passes through the antenna down cable 12 to a bandpass filter 14 which in turn passes a predetermined frequency range, including the frequency of interest. The signal from the bandpass filter 14 is applied to an amplification stage using a low noi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A noise suppression apparatus (5) for use in a receiver includes an input terminal (17) adapted to receive an inbound signal. A channel splitter (18) is coupled to the input terminal and configured to split the inbound signal into a substantially identical first signal (20) and second signal(22). A first mixer (24) coupled to the channel splitter and configured to receive the first signal, and a second mixer (30) coupled to the channel splitter and configured to receive the second signal. A first local oscillator (26) is coupled to the first mixer and configured to generate a first LO frequency signal (L01), and a second local oscillator (32) coupled to the second mixer and configured to generate a second LO frequency signal (L02), where the first LO frequency signal and second LO frequency signal differ from one another. The first mixer is configured to mix the first signal with the first LO frequency signal to create a first mixed signal, and the second mixer is configured to mix the second signal with the second LO frequency signal to create a second mixed signal. A combiner (44) is coupled to the first mixer and the second mixer and configured to combine the first mixed signal with the second mixed signal to create a noise suppressed output signal.

Description

field of invention [0001] The present invention relates generally to noise suppression systems in receivers, and more particularly to cellular radio communication systems. Background technique [0002] Conventional radio frequency receivers are well known in the art, as are the many noise problems associated therewith. Noise problems can be categorized as externally generated noise and internally generated noise. Externally generated noise is generally related to interference from other RF sources such as other radios, electrical equipment, etc. Internally generated noise is generally related to thermal noise, electrical incompatibilities between internal components, etc. [0003] A major problem with introducing noise is that it degrades signal clarity and can prevent an RF receiver from recognizing and filtering out the desired signal. In fact, signal clarity decreases proportionally to the amount of noise. There are some conventional techniques for reducing externally...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04B1/12
CPCH04B1/123
Inventor N·S·维莱特
Owner INTERWAVE COMM
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap