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Broadband up-converter and up-conversion method

A frequency converter and broadband technology, applied in the field of communication, can solve the problems of inability to achieve broadband coverage and complex structure, and achieve the effects of reducing design complexity, improving design reliability, and high reliability

Active Publication Date: 2013-05-08
CHENGDU KAITENG SIFANG DIGITAL RADIO & TELEVISION EQUIP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has the advantages of simple structure, less spurious burrs, low current consumption and only one up-conversion (so only one frequency synthesizer is needed). Although the analog intermediate frequency one-time conversion scheme has great advantages, it also has some defects: it cannot Wideband coverage with LO signal and corresponding image frequency next to its output spectrum
This solution can realize the broadband frequency conversion function, and can basically meet the relevant national standards, but the realization structure is complicated

Method used

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Embodiment approach

[0072] As a preferred embodiment of the present invention: the small-step spectrum shifting is implemented in an FPGA chip, that is, the FPGA chip is programmed to realize the functions of a digitally controlled oscillator and a complex multiplier. According to needs, the phase accumulator of FPGA can be set to 32Bits or higher precision. Preferably, it is set to 32Bits, the working clock of FPGA is 30MHz, and the minimum frequency step can be 0.007Hz (30MHz / 2 32 ), that is, the ω mentioned at this time 1 The value is 0.014π.

[0073] The existing broadband inverter integrated with 2400MSPS 14-bit DAC on the market is used to realize the second up-conversion, that is, the existing broadband frequency conversion chip is used to realize multiplier 1, multiplier 2, digital control oscillator 2, subtractor, Functions of data processing module, DA converter, and clock processing module. The wideband drive has a flexible digital interface that can accept up to four channels of com...

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Abstract

The invention discloses a broadband up-converter and an up-conversion method. The invention relates to the technical field of communication, in particular to a digital broadband up-converter and a digital up-conversion method in a digital wireless broadcast technology. The up-conversion method is mainly characterized by comprising the following steps of: carrying out first up-conversion on a digital baseband I / Q (In-phase / Quadrature) signal by adopting a complex multiplier and a digital controlled oscillator I, namely a frequency spectrum shift with small step; then carrying out secondary up-conversion on the digital signal subjected to the frequency spectrum shift with small step to shift the signal frequency spectrum to the needed high frequency section; finally, further processing the signal and then converting the signal into a simulated radio-frequency signal, and wirelessly transmitting the simulated radio-frequency signal to a receiving end by an emitter. In the invention, the up-conversion method can realize broadband up-conversion of with small step adjustment and the broadband up-converter has the advantages of simple structure and good reliability.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a digital broadband up-converter and a digital up-conversion method in digital wireless broadcasting technology. Background technique [0002] Explanation of technical terms in the text: [0003] 1. OFDM modulation: Orthogonal frequency division multiplexing technology, a type of multi-carrier modulation. Its main mechanism: divide the channel into several orthogonal sub-channels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate them for transmission on each sub-channel. Orthogonal signals can be separated by using correlation techniques at the receiving end, which can reduce the mutual interference between sub-channels. The signal bandwidth on each sub-channel is smaller than the correlation bandwidth of the channel, so each sub-channel can be regarded as flat fading, so that inter-symbol interference can be eliminated. [0004] 2. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03D7/16
Inventor 马亮
Owner CHENGDU KAITENG SIFANG DIGITAL RADIO & TELEVISION EQUIP CO LTD
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