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Carrier leakage adaptive elimination system in direct frequency conversion modulation

A technology of variable frequency modulation and carrier leakage, applied in multi-carrier systems, modulation transfer, amplitude modulation components, etc., can solve the problems of slowness and unsatisfactory elimination of carrier leakage, achieve the effect of suppressing carrier leakage and superior output analog radio frequency characteristics

Active Publication Date: 2009-07-08
上海全波通信技术有限公司
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  • Abstract
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Problems solved by technology

However, this technology is based on the fact that carrier leakage is a slow, time-invariant process, and does not require continuous compensation. At the same time, the main signal needs to be interrupted during compensation, so it cannot meet the purpose of real-time, automatic and continuous elimination of carrier leakage.

Method used

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  • Carrier leakage adaptive elimination system in direct frequency conversion modulation
  • Carrier leakage adaptive elimination system in direct frequency conversion modulation
  • Carrier leakage adaptive elimination system in direct frequency conversion modulation

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Embodiment Construction

[0029] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0030] Such as figure 1 Shown is a schematic diagram of the application of this embodiment 1. Embodiment 1 includes: a down-conversion module 100, a demodulation and frequency-phase recovery module 200, a DC detection module 300, a feedback module 400, a modulation system 500, and a transmitting antenna 600, wherein: down-conversion After the input end of the module 100 is coupled with the transmitting antenna 600, the radio frequency signal to be processed is received and the baseband signal is output to the demodulation and frequency phase recovery module 200, and ...

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Abstract

The invention relates to an adaptive rejection system for carrier wave leakage in direct frequency conversion modulation in the DSP technology field. The system comprises a down-conversion module, a demodulation and frequency phase recovering module, a DC detection module and a feedback module. The adaptive rejection system can automatically monitor, track and compensate for the DC component caused by the changes in environmental temperature and humidity in all elements in a whole up-conversion link without interrupting a master signal, and the adaptive feedback structure has high precision at the same time.

Description

technical field [0001] The invention relates to a system in the technical field of digital signal processing, in particular to an adaptive elimination system for carrier leakage in direct frequency conversion modulation. Background technique [0002] In a digital signal transmission system, it is necessary to up-convert the baseband signal to a radio frequency. Taking a digital TV transmission system as an example, an 8MHz baseband signal needs to be up-converted to a corresponding radio frequency, such as 48MHz to 866MHz. Traditional up-conversion has the following three methods: triple frequency conversion, secondary frequency conversion and direct frequency conversion. [0003] Triple frequency conversion can better filter out image spectrum, the frequency points of each analog filter are fixed, and the performance of the system is consistent at each frequency point. The LO frequency is not in the desired frequency band and is well filtered out along with the image spec...

Claims

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Application Information

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IPC IPC(8): H03D7/00H03C1/02H04L27/32
Inventor 范莹莹王泽颖王先勇
Owner 上海全波通信技术有限公司
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