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Method and system for suppressing carrier leakage

A technology of controllers and equations, applied in the direction of AM carrier system, etc., can solve problems such as complex mixers and low tolerance

Inactive Publication Date: 2006-07-26
INTERDIGITAL TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In transmitters and transceivers utilizing extrapolation circuitry, LO feed-in can be dramatically reduced by using proper frequency planning and filtering, however, in wideband systems the RF and LO frequency bands often partially overlap, and for interpolation For conventional transmitters, the RF and LO bands are practically always partially overlapping
[0007] Several methods exist for suppressing LO spillage, including those using RF parametric balancing techniques, however, practical component tolerances rarely allow more than about 30dB of carrier spillage suppression
[0008] Other techniques that add a correctly leveled and phase shifted portion of the LO signal to an RF signal have the disadvantage of requiring very complex mixers

Method used

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  • Method and system for suppressing carrier leakage
  • Method and system for suppressing carrier leakage
  • Method and system for suppressing carrier leakage

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Embodiment Construction

[0025] FIG. 1 is a block diagram of a DBB RF transmitter 100 configured in accordance with a preferred embodiment of the present invention. Although the present invention will be described with reference to implementation on a transmitter 100, those skilled in the art will understand that the present invention is equally applicable to a transceiver, however, for simplicity, the present invention will be described in terms of implementation on a transmitter 100. Description of implementation.

[0026] Preferably, the methods and systems disclosed herein are integrated into a wireless transmit / receive unit (WTRU). Hereinafter, a WTRU includes, but is not limited to, a user equipment, mobile station, fixed or mobile subscriber unit, pager or any other type of device capable of operating in a wireless environment. The features of the present invention may be integrated into an integrated circuit (IC) or deployed on a circuit comprising many interconnected components.

[0027] Th...

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Abstract

The present invention provides a method and system for determining at least one DC offset compensation value used to suppress carrier leakage occurring on real and imaginary signal paths in an analog radio transmitter when a significant temperature change in the transmitter is detected. At least one DC offset signal having a level that corresponds to the at least one DC offset compensation value is provided to a digital DC offset compensation module which adjusts the DC level of at least one of the real and imaginary signal paths.

Description

technical field [0001] The present invention generally relates to the design of a transmitter in a wireless communication system, and more particularly relates to digital signal processing technology for compensating a carrier leakage induced by an analog wireless transmitter. Background technique [0002] Existing wireless system architecture configurations impose severe constraints on the system designer with respect to the transmitter communication signal, and in addition these configurations typically provide low reliability communication links, high operating costs, and an undesirably low degree of integration with other system components . [0003] In the radio frequency (RF) part of the existing low-cost wireless transmitter configured with analog components, when the RF signal is processed, a considerable degree of distortion occurs, and the higher-cost components with better distortion characteristics that enhance signal quality It may be neglected during design so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/04
Inventor 艾佩斯兰·戴米尔利昻德·卡萨凯费许坦毕尔·哈克
Owner INTERDIGITAL TECH CORP