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Systems and methods for spurious emission cancellation

A technology for transmitters and predistortion coefficients, which is applied in transmission systems, synchronization/start-stop systems, components of amplifiers, etc., and can solve problems such as changing the signal strength of mixers

Active Publication Date: 2012-10-24
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] ●The power control system may change the signal strength of the mixer

Method used

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  • Systems and methods for spurious emission cancellation
  • Systems and methods for spurious emission cancellation
  • Systems and methods for spurious emission cancellation

Examples

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Embodiment Construction

[0023] figure 1 The figure shows a block diagram of an example wireless communication system 100 according to some embodiments of the present disclosure. For simplicity, in figure 1 Only two terminals 110 and two base stations 120 are shown in . Terminals 110 may also be called remote stations, mobile stations, access terminals, user equipment (UE), wireless communication devices, cellular telephones or some other terminology. Base station 120 may be a fixed station and may also be called an access point, Node B or some other terminology. A Mobile Switching Center (MSC) 140 may be coupled to base stations 120 and may provide coordination and control for base stations 120 .

[0024] Terminal 110 may or may not be able to receive signals from satellite 130 . The satellites 130 may belong to a satellite positioning system such as the well-known Global Positioning System (GPS). Each GPS satellite can transmit a GPS signal encoded with information that allows GPS receivers on ...

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Abstract

In accordance with some embodiments of the present disclosure, a method may include digitally pre-distorting a digital baseband signal with an opposite phase of a C-IM3 distortion term such that the pre-distortion and C-IM3 distortion cancel each other out in a transmitter. The method may also include digitally conditioning the pre-distorted digital signal in order to provide a flat amplitude response of a composite filter comprising a baseband filter and a digital half-band filter of the transmitter, and to provide a linear phase response for the composite filter.

Description

technical field [0001] The present disclosure relates generally to wireless communications, and more particularly to cancellation of spurious emissions in wireless communication devices. Background technique [0002] Wireless communication systems are used in a variety of telecommunications systems, television, radio and other media systems, data communication networks, and other systems that utilize wireless transmitters and wireless receivers to communicate information between remote points. A transmitter is an electronic device that propagates electromagnetic signals, such as radio, television or other telecommunication signals, usually with the aid of an antenna. Transmitters often include a signal amplifier that receives a radio frequency or other signal, amplifies the signal with a predetermined gain, and transmits the amplified signal. A receiver, on the other hand, is an electronic device that receives and processes wireless electromagnetic signals, usually also wit...

Claims

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Application Information

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IPC IPC(8): H04B1/04H04L25/49
CPCH04B2001/0425H04B1/0475H03F1/3241H03F3/24H04B1/62H04B1/04
Inventor 许兵克莱夫·唐马海布·拉曼
Owner APPLE INC
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