An easy-to-realize method and device for full digital frequency conversion

Abstract

The invention discloses an all digital frequency converting method and a device thereof, being easily realized for hardware. The method and the device are essentially used for sample rate convertion of rational number-times of baseband signals and the convertion of the baseband signals and the intermediate frequency signals in digital communication. Under the coordination of control signals and enabling signals, the convertion of signal sample rate can be finished and the convertion of the baseband signals and the intermediate signals can be finished through the reasonable matching of variable integral number-times wave filtering and fraction-times interpolation. The system of the invention essentially comprises a frequency mixer, a cascade connection integral comb filter, a fraction-time interpolating device, a half-band filter, a signal shaping filter, a power detection module and a control interface. The configurable hardware implemented structure of the invention is applicable to a plurality of modulation methods, has the advantages of low resource consumption and good portability, and is used for various wireless communication systems such as multilevel phase shift keying (MPSK), orthogonal frequency division multiplex (OFDM), direct sequence spread spectrum (DSSS) and continuous phase modulation (CPM), etc.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to frequency conversion of signals. Background technique [0002] Frequency conversion is an essential part of the communication system, and has important application value in the fields of mobile communication, digital broadcasting and television. [0003] With the rapid development of mobile communication and personal communication technology, various communication systems have been widely used and are constantly being updated. The communication systems or communication equipment of different standards used by different communication services require multi-band, multi-rate, multi-mode, upgradeable and intelligent communication systems with an open structure. Software radio technology has strong flexibility and openness, which can ensure the versatility, compatibility and upgradeability of communication equipment, and adapt to the development trend of communication. The basi...

AI Technical Summary

Problems solved by technology

[0007] 1. The down-conversion system can only realize integer multiple sampling rate conversion, but cannot realize rational multiple sampling rate conversion

There is no general rational multiple sampling rate conversion structure, and the versatility is insufficient, and a down-conversion system that requires rational multiple sampling rate conversion is not possible

[0008] 2. The down-conversion system does not provide a general implementation method for the multiple variable decimation filter module, and encounters difficulties in satisfying multiple sampling rate conversions

[0009] 3. The down-conversion system does not provide a general configuration interface, and it is impossible to complete the conversion of multiple sampling rates on a hardware platform through register configuration. It needs to be recompiled and downloaded. It is not suitable for realizing a general-purpose frequency conversion platform through an application-specific integrated circuit.

[0010] 4. The down-conversion system does not provide the phase and frequency compensation interface of the numerical control oscillator, and cannot flexibly complete the carrier control

The frequency sweep interface cannot be realized, and the frequency offset control cannot be realized by frequency sweep

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