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May 29, 2013 · Secondly,we considered BPSK modulation scheme and simulated the system using Square Root Raised Cosine (SQRC) filter as pulse shaping filter and matched filter and we found minimum number of co-efficientsuch that the loss did not exceed 0.5db .Applied same filter to QPSK and 8-QAM and compared the results.We evaluated the coded performance of ... Erie county dispatch log
We will get the same results as for the in-phase channel and a constellation also made of four symbols in the studied example. -3, -1, 1 and 3. We have defined the constellations of the in-phase and in-quadrature channels. We will now define the constellation of the global modulation. It is a bi-dimensional modulation just like the QPSK.

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Dec 01, 2015 · As can be seen on Fig. 13, the QPSK modulation can be used for longer distances than the 8PSK, since the phase distance between individual symbols is greater (decision levels of the QPSK demodulator are from 0 to [pi] for the first bit and from--[pi]/2 to [pi]/2 for the second bit). On Fig. 14, 8PSK optical signals are shown.

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QPSK_RX implements a QPSK (Quadrature Phase Shift Keyed) receiver with demodulation and detection functions.It operates on a noisy Complex Envelope (CE) sampled-data waveform to produce estimates of the original transmitted bit stream.

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I am trying to make a AM modem using Python Numpy and Matplotlib. I am successful in generating the AM Signal but I cannot demodulate it using a lowpass filter function that I made. ... Browse other questions tagged python lowpass-filter modulation demodulation numpy or ask your own question. The Overflow Blog The Loop: A community health ...

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Unable to load block diagram 'commdigbbndpm2'.using uwb ofdm transmitter in simulink.QPSK Demodulator Baseband is not working in 2013b pls help 5 Comments Show Hide 2 older comments

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(SNR) for BPSK QPSK, QAM 16, QAM, 64 and QAM 256 modulation technique. MSE Equalizer for BPSK QPSK, QAM 16, QAM, 64 and QAM 256 modulation technique. It is impossible without smart antenna 4 by 8 means 4 transmitter and 8 receivers. Earlier we use only single or dual antenna now we use array of antenna to provide much

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In DPSK modulation, serial binary data pass through X-NOR gate and the output is fed back via 1 bit delay. The resulting bit stream is applied to the balanced modulator to produce DPSK signal. DPSK demodulation using DPSK demodulator. Figure-2 depicts the process of DPSK demodulation using DPSK demodulator in the form of a block diagram.

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Using trigonometric identities, this equation can also be written as. S(t) = cos[ 2πf 0 t + Θ(t) ] The value of Θ(t) will correspond to one of the four possible combinations of d I (t) and d q (t) in the equation (1). Θ(t) = 0 o, ± 90 o, or 180 o. QPSK MODULATOR QPSK DEMODULATOR

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The recommended modulation technique for bit synchronous timing is coherent QPSK with differential encoding for the uplink and coherent QPSK for the downlink. This report addresses modulation and synchronization techniques for a multi-frequency time division multiple access (MF-TDMA) system with onboard baseband processing.

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Performance simulation over AWGN. The complete waveform simulation for the aforementioned QPSK modulation and demodulation is given next. The simulation involves, generating random message bits, modulating them using QPSK modulation, addition of AWGN channel noise corresponding to the given signal-to-noise ratio and demodulating the noisy signal using a coherent QPSK receiver.

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I am working on a project to be able to demodulate satellite radio using GNU Radio. The goal is to figure out what modulation is being used. It's not traditional DVB, but a hybrid of QPSK and OFDM modulation. The width of the carrier is 12.5Mhz. You need to show that you have experience doing GNU radio demodulations to win this project.

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