Method and device for realizing digital baseband variable velocity to convert modulating system
A rate conversion and modulation system technology, applied in digital transmission systems, modulated carrier systems, transmission systems, etc., can solve the problems of cumbersome design of dedicated sampling rate conversion modules, high hardware resource occupation, low adaptability, etc., to improve flexibility flexibility and applicability, ease of expansion, and the effect of reducing hardware resource occupancy
Inactive Publication Date: 2008-09-03
TSINGHUA UNIV
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Problems solved by technology
[0010] The technical problem to be solved in the present invention is that the design work of the dedicated sampling rate conversion module in the known technology is cumbersome, the flexibility and the adaptability are not high, or the hardware resources are high, but the utilization rate is low and many other deficiencies. place, it is necessary to propose a new implementation method and implementation device. The purpose of the present invention is to provide a implementation method and implementation device of a digital baseband variable rate conversion modulation system. The technical scheme adopted is as follows, a digital baseband The realization method of the variable rate switching modulation system is characterized in that, the following steps are carried out:
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[0030] The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0031] The invention provides a method for realizing a digital baseband variable rate conversion modulation system and a realization device adopted in the method. The implementation method of the digital baseband variable rate conversion modulation system and the specific implementation of the realization device are described in detail below, and then the reference implementation scheme is given for the digital baseband variable rate conversion demodulation system, and finally the digital baseband variable rate conversion modulation system is given. A reference extension scheme is proposed. refer to Figure 1a , Figure 1b , represents the schematic diagram of interpolation and extraction operations under different multiples; Figure 2a , Figure 2b Representing one symbol rate and multiple symbol rates to a fixed sampling rate f samp c...
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An implement method of the digital baseband variable speed conversion modulating system and implement equipment belong to the digital signal processing technical field. The method is operated by the following steps: A. The system controls the clock to generate the required clocks with a plurality of frequency; B. the clock control is transported to the speed converting module; C. The lowpass in the speed converting module completes the demirror filter and the gain compensation after N-time interpolation with the working frequency of fsamp. The equipment includes a clock control module, a baseband modulate module, a speed converting module, a DAC module and a radio frequency modulate module etc. The invention adopts the same system to realize the multi-sample digital signal processing aiming at the variable baseband symbol speed and corresponding sampling speed converting time, which reduces the occupancy of the hardware resource, increases the flexibility and the applicability of the system and is easy to expand.
Description
technical field [0001] The invention belongs to the technical field of digital signal processing, and in particular relates to a method for realizing a digital baseband variable rate conversion modulation system and a device for realizing it. Background technique [0002] In the digital multimedia mobile transmission system, after the baseband modulation is completed, the signal at the modulation end needs to increase the sampling rate, and enter the DAC (digital-to-analog conversion circuit) and the back-end radio frequency modulation at a fixed sampling rate. [0003] Multirate digital signal processing (multirate digital signal processing) is a technology that processes signals of different sampling rates in the same system, and its core is to realize the conversion of digital signals between different sampling rates. [0004] The two main operations in multi-sampling rate signal processing are interpolation and decimation, which function to increase and decrease the samp...
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Login to View More IPC IPC(8): H04L27/38H04L27/148
Inventor 彭克武刘在爽阳辉卢莹莹潘长勇
Owner TSINGHUA UNIV