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Wireless data transmission terminal and intermediate frequency processing method thereof

A digital intermediate frequency and terminal technology, applied in the field of wireless data transmission, can solve the problems of rising terminal cost and power consumption, obvious difference in power consumption, and high sampling rate

Inactive Publication Date: 2013-01-30
POTEVIO INFORMATION TECH
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AI Technical Summary

Problems solved by technology

[0010] 2. High sampling rate means more multiplication or other calculations are required
Compared with the usual low-end AD (speed at 200KSps), the price gap is large, and the power consumption difference is obvious
2. The use of DSP will bring about an increase in terminal cost and power consumption

Method used

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  • Wireless data transmission terminal and intermediate frequency processing method thereof
  • Wireless data transmission terminal and intermediate frequency processing method thereof
  • Wireless data transmission terminal and intermediate frequency processing method thereof

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Embodiment Construction

[0047] The digital intermediate frequency structure of the wireless data transmission terminal in the prior art is difficult to ensure that the center frequency image of the signal is separated from the zero-frequency baseband signal. The specific derivation is as follows:

[0048] The function realized by the digital intermediate frequency structure is to mirror the intermediate frequency signal from the center to the frequency point f C_alias (The oversampling method is the center frequency point itself) moved to zero frequency. Let the baseband signal be φ(t) and the bandwidth be f φ (In this example, the channel bandwidth is 25Khz, the SSB is 12.5Khz), and the sampling frequency is f s , then the discrete signal after AD sampling is: cos(2πf C_alias +φ(t)).

[0049] The baseband I and Q signals that need to be obtained are: cos(φ(t)), sin(φ(t)), and the design scheme for obtaining IQ signals is as follows:

[0050] I channel acquisition method: combine the AD sampling ...

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Abstract

The invention provides a wireless data transmission terminal. A digital intermediate frequency structure of the wireless data transmission terminal is used for under-sampling processing of intermediate frequency signals, then a complex band-pass filter is used for completing aliasing cancellation and out-of-band rejection, and finally decimation filtering and frequency mixing are carried out. The invention further provides a digital intermediate frequency processing method. The wireless data transmission terminal and the digital intermediate frequency processing method are capable of achieving intermediate frequency signal sampling in the condition of low cost and low power consumption.

Description

technical field [0001] The invention relates to wireless data transmission technology, in particular to a wireless data transmission terminal and an intermediate frequency processing method thereof. Background technique [0002] Traditional wireless data transmission terminals (wireless data transmission terminals) are mainly used to undertake remote data collection work, and usually use a pre-allocated narrowband frequency resource (with a bandwidth of 25KHz) for communication. Communication architecture such as figure 1 As shown: 101 represents a wireless data transmission terminal, 102 represents a base station, and 103 represents a console. [0003] Since wireless data transmission terminals are usually placed in areas with harsh conditions, corresponding requirements are put forward for the use conditions, cost, and power consumption of the terminals, which are usually expressed as: 1. Low cost, 2. Low power consumption, and 3. Robustness. [0004] The basic IF down-c...

Claims

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Application Information

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IPC IPC(8): H04B1/38H04B1/3827
Inventor 李庆华陶雄强邢益海闫淑辉刘建明李祥珍胡炜徐宏祝锋邓晓晖
Owner POTEVIO INFORMATION TECH
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