Demodulator Design: We do coherent demodulation of the BPSK signal at the receiver. Coherent demodulation requires the received signal to be multiplied with the carrier having the same frequency and phase as at the transmitter. The phase synchronization is normally achieved using Phase Locked Loop (P...
FIG. 1B shows a block diagram of a BPSK demodulator using a Costas loop design; FIG. 2A shows a block diagram of one embodiment of a low power BPSK demodulator; FIG. 2B shows a simple circuit implementation of the BPSK demodulator of FIG. 2A; ...
FIG. 3 shows a block diagram illustration of another embodiment of the BPSK demodulator of the present invention including improvements for reducing the possibility of false tracking and loss of phase lock by the VCO. In general terms, feedback of the phase error signal is inhibited under low ...
BPSK-BINARYPHASESHIFTKEYING：二进制相移键控BPSK BPSK - BINARY PHASE SHIFT KEYING PREPARATION (70)generation of BPSK (70)bandlimiting (71)BPSK demodulation (72)phase ambiguity (72)EXPERIMENT (73)the BPSK generator (73)BPSK demodulator (74)measurements (75)further study (76)TUTORIAL QUESTIONS (77...
The digital demodulator can be divided into the DSP and DDS sections. The block diagram of the receiver is shown in Fig. 1.1 below. Figure 1.1 Receiver block diagram2. DESIGN PROCEDURE 2.1 Digital Signal Processor (DSP) The DSP was the control component of our system. It ran the software ...
数字调制器用直接数字合成(DI)S)专用芯片 实现,一个基本的DDS电路包括相位累加器,相 位调制器,相位/幅度变换电路, A变换器以及 控制电路组成,如图1.DDS电路可通过编程,分 别实现PSK,FSK,AM和QAM等多种调制方 式,并且具有调制速率高,载频可调等优点 图L数字漏制器的组成方框图 Fig.1 Blockdiagramofdigitalmod...
signal. A synchronous demodulator would be sensitive to these phase reversals. Figure 2: a BPSK signal A snap-shot of a BPSK signal in the time domain is shown in Figure 2 (lower trace). The upper trace is the binary message sequence. ...
BITS DATA ESTIMATES DATA BIT ENCODER HAMMING DECODER HAMMING DEMODULATOR (HARD DECISION) BITS Figure 1: Block Diagram of the Hamming-coded BPSK system to be simulated. The (7, 4) Hamming code has the following generator matrix: G =
“. Design facilities of the modulator in the FPGA are presented in this paper using a VHDL language and DDS component in the Xilinx ISE development tool. The basic buil- ding block is a DDS synthesizer accessible as an intelectual property core. The result is a modulator simulation model ...
A device that performs modulation is known as a modulator and a device that performs the demodulation is known as a demodulator. Fig 1: Basic Digital communication system In the basic digital communication model as shown in Fig1 the first three blocks of the diagram (analog source , Analog ...