This article describes how two synchronized DDS channels can implement a zero-crossing FSK or PSK modulator. Here, the AD9958 two-channel, 500-MSPS, complete DDS (see Appendix) is used to switch frequencies or phases at the zero-crossing point, but any two-channel synchronized solution should...
1. Block diagram of a PSK modulator and demodulator system for implementing the method of the present invention. [0016] FIG. 2. Plot of a filtered phase detector output voltage vs. delta phase. [0017] FIG. 3. Plot of a phase detector output voltage vs. delta phase showing an example...
Must be consistent with the modulator symbol rate, modulation type, FEC rate, HDLC overhead (when enabled). When HDLC is disabled, this field MUST be set to be at least slightly greater than the transmitter throughput (or else an underflow condition will occur). f * 2 / f32 input bit ...
点击【diagram】下拉菜单下的Region to Super Block,生成如下所示的超级模块: hhF心袱>:■ Jill Vaw 1urd.ii.itieli t |O 图8 MPSK调制的超级模块生成 右击载波提取超级模块,在下拉菜单下点击Properties—Icon项弹出一个窗口,将窗口中 的内容用如下内容替换: xstringb(orig(1),orig(2),'MPSK Modulator',sz...
FIG. 4illustrates a schematic diagram of a high speed quadrature phase shift key (QPSK) RSFQ output interface in accordance with an aspect of the present invention. FIG. 5illustrates a schematic block diagram of a variable encoding system in accordance with an aspect of the present invention. ...
Absolute coherent PSK detection without differential encoding is the best detection technique. It is also useful for a random error correction circuit. In this paper, carrier recovery circuit, which is composed of reverse-modulator and tank-limiter with APC, is investigated and realized to stably ex...
(基带QPSK调制器)的主要参数模块名称QPSKModulatorBaseband位置CommunicationsBlocksetModulationDigitalBsebandModulation参数名称参数值Inputtype(输入类型)IntegerPhaseoffset(相位偏移)Pi/4Samplespertime1FIRInterpolation(FIR插补器)的主要参数模块名称FIRInterpolation位置DSPBlocksetFilters参数名称参数值FIRfiltercoefficients(FIR滤波...
点击【diagram】下拉菜单下的Region to Super Block,生成如下所示的超级模块: 图8 MPSK调制的超级模块生成 右击载波提取超级模块,在下拉菜单下点击Properties—Icon项弹出一个窗口,将窗口中的内容用如下内容替换: xstringb(orig(1),orig(2),'MPSK Modulator',sz(1),sz(2),'fill'); 得到如下图所示形式: 图...
9. The receiver of any of claims 5-8 wherein the phase shifter or the sigma-delta modulator of the means for controlling when sampling occurs is responsive to a comparison of indications of a function of the values of the at least one of said digital signals for differing ones of said ...