Concurrent dual-band transmitter with band-pass and low-pass delta-sigma hybrid modulation
A dual-band, transmitter technology, applied in the application field of broadband and multi-band systems, can solve problems such as no public reports, and achieve the effect of improving the signal-to-noise ratio of the system
Inactive Publication Date: 2016-12-14
YUNNAN UNIV
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[0004] The present invention relates to a band-pass and low-pass The concurrent dual-band transmitter of mixed modulation, through literature search, does not see the public report identical with the present invention
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[0039] The present invention relates to a band-pass and low-pass Hybrid modulated concurrent dual-band transmitters such as figure 1 As shown, it consists of a baseband part (9) and a radio frequency part (10);
[0040] Such as Figure 4 Shown is a system block diagram implemented using Matlab / Simulink, where the input signal frequency is obtained under the condition of "coherent sampling". , is the number of time domain cycles, is the number of sampling points, in In the algorithm, generally take is an integer power of 2, is the oversampling frequency of the modulator, and spectrum leakage can be avoided by this method;
[0041] upper branch band pass The modulator structure is figure 2 Then, the lower branch low-pass Each proportional coefficient in the modulator structure is as Figure 10 shown;
[0042] There are many sets of value options for the selection of the carrier frequency of the upper and lower branches: , ; , ; , etc. and other ...
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The invention relates to a concurrent dual-band transmitter based on a hybrid structure of a low-pass delta-sigma modulator and a band-pass delta-sigma modulator, and belongs to the field of application of bandwidth and multiband systems. Noise shaping is respectively performed on two different input signals through the band-pass delta-sigma modulator (2) and the low-pass delta-sigma modulator (3) after the two different input signals are processed by a DSP (1), and then the up-conversion is performed on the input signals and two different carriers, the carrier frequencies are respectively the same as the corresponding modulator over-sampling frequencies (4, 5); two paths of signals at the upper side and the lower side are combined (6) with the same clock frequency, and then are amplified (7) and filtered (8), and finally the dual-frequency signal is sent. The transmitter disclosed by the invention has the advantages that the delta-sigma modulator structures in the upper branch and the lower branch are flexible and simple, the transmission of the two paths of signals do not interfere with each other, the aggregation of discontinuous frequency spectrums is realized; and the carrier frequencies are the same as the modulator over-sampling frequencies, the clock frequency of the entire system is lowered, and the implementation is facilitated.
Description
technical field [0001] The present invention relates to a band-pass and low-pass The invention relates to a mixed-modulated concurrent dual-band transmitter, which belongs to the application field of broadband and multi-band systems. Background technique [0002] As broadband and multi-frequency systems are more and more widely used, discontinuous spectrum aggregation technology has received more and more attention. In the transmitter system, the modulation device is an integral part, where The modulator has obvious advantages and can achieve high conversion accuracy and signal-to-noise ratio. Moreover, through oversampling and noise shaping technology, the noise in the signal band is reduced, and a good noise shaping effect is achieved. [0003] Currently, the dual-band transmitter's The signal bandwidth of the modulator is small, and for two different input signals, after When modulator noise shaping, the structure of its two branches is the same, that is, both lo...
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IPC IPC(8): H04B1/04H03M3/00
CPCH03M3/30H03M3/402H04B1/04H04B1/0483H04B2001/0491
Inventor 申东娅贺继芹张秀普任文平董明曾杰
Owner YUNNAN UNIV