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Adaptive Balance System of Iq Amplitude in Direct Conversion Modulation

A frequency conversion modulation and balance system technology, applied in the transmission system, radio transmission system, electrical components, etc., can solve the problems of not distinguishing between I and Q amplitude difference, unable to compensate, etc., and achieve the effect of superior output analog radio frequency characteristics

Active Publication Date: 2012-02-01
ANYWAVE COMM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ADC and DAC of this technology only use a single I-channel signal, and the Q-channel signal is directly generated by the I-channel, and does not distinguish the amplitude difference between I and Q, so it cannot compensate for the amplitude difference between I and Q.

Method used

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  • Adaptive Balance System of Iq Amplitude in Direct Conversion Modulation
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  • Adaptive Balance System of Iq Amplitude in Direct 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 1Shown 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, an averager 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 the d...

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Abstract

An adaptive balance system for IQ amplitude in direct conversion modulation in the technical field of digital signal processing, comprising: a down-conversion module, a demodulation and frequency-phase recovery module, an averager module and a feedback module, wherein: the input terminal of the down-conversion module receives The radio frequency signal to be processed and the baseband signal is sent to the demodulation and frequency phase recovery module and the feedback module. The demodulation and frequency phase recovery module demodulates the baseband signal and recovers the frequency and phase of the carrier, and then transmits it to the averager module. The averager module Transmit the calculated power amplitude difference to the feedback module, the feedback module is set at the output end of the modulation system and simultaneously receives the baseband data from the modulation system and the power amplitude difference from the averager module, and the output end of the feedback module is connected to the transmitter antenna. The invention can automatically monitor, track and compensate the I and Q amplitude difference caused by ambient temperature and humidity changes in all devices in the whole up-conversion link, and meanwhile, the self-adaptive feedback structure has high precision.

Description

technical field [0001] The invention relates to a system in the technical field of digital signal processing, in particular to an adaptive balance system of IQ amplitude 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 spectrum. H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/00H04B7/00
Inventor 范莹莹王泽颖王先勇
Owner ANYWAVE COMM TECH
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