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61 Threads found on edaboard.com: Qpsk Modulator
I am designing a channel encoder (BCH/RS/Turbo) + modulator based digital communication system in simulink. My blocks in the design are 1) Ber. B. Gen/Ran Int Gen 2) BCH (15,7) or RS (255,223) Encoder & Decoder 3) qpsk/M-ary PSK Mod & De Mod 4) AWGN Channel the problem i am facing is the input to the (...)
Hi, I want to know the schematic that should be used for a qpsk ring modulator? A basic functional schematic should be great. Best Regards Guruditya Sinha
Hi, Is there a way to do pulse shaping in MUX based qpsk modulator? I am having a bad ACLR.
Hi every body, I want to use HMC795 as a qpsk modulator. Does any body know how can I use it? I mean does it have 90 degree phase shift in I and Q mixer or I should make it in other ways? thank you
Hi, I am new to TMS320c6713.Please developing codes related to FILTER DESIGNING.also algorithm related to qpsk modulator and demodulator
Hi, maybe these links may help.. :)
dear all, i want to measure the BER of qpsk in presence of noise, i have used system level blocks for qpsk modulator, amplifier and attenuator and simulated using circuit envelope. i have used the ber_qpsk() function to plot the BER vs Eb/No plot, which gives me an ideal curve, now i want to add some noise in between the (...)
Hi all; Please I need Good simulation program to test hardware implementation for qpsk modulator and demodulator ,,,,,,,, I used Circuitmaker and it gives errors ??!!! ,,,,,,,,,, and multisim does not have MC1496 as all Suggestions around the world worked as multiplier ???? Thank you for any help Rawan Ayyoub
I want to design a PSK (BPSK/DPSL/qpsk/Oqpsk) modulated transmitter using FPGA based board. Output can be 70MHz IF or directly S-band modualted RF signal. Input will be 10Mbps NRZ-L serial data. I've heard about IQ modulator which takes baseband analog input & generates RF output. Does anyone has block diagram of IQ modualtor scheme ?
hi there, i would like to know the difference between raised cosine and root raised cosine in qpsk modulator.thank you
hi, i would like to know where to put the RRC at the modulator? whether before modulation process(Block diagram A) or after modulation process (Block diagram B)?is there going to be any difference between
This is my very first post on this forum so I want to warmly welcome all of users. After few days of reasearch about digital modulation I've already started my bachelor's thesis. And of course without, as a begginer in digital modulations and in Matlab as well I have some problems. I've started with qpsk modulator (I think ;)) unfortunate
Now I am designing a circuit for IQ modulating. The main chip is HMC497, from hittite microwave. It seems to be all right that I was able to modulate the baseband signal with the LO signal to get an IQ-modulated rf signal. But when I test the EVM of the output, such as at 1900MHz, I found a puzzling question. When I use the E4438, from agilent, as
Thanks to the kind-hearted people in the forum, I was able to understand the basic I/Q modulator such as HMC497. Now I am testing the RF IQ output. I use the E8267D from Agilent as the I/Q baseband signal generator. In the beginning I test the qpsk signals, the symbol row was used as fixed four, such as "1001". Then I tuned the DC offset to suppres
Hi, This's a qpsk modulator, hope it'll be useful for you.
what is the power consumption in FPGA for 50MHz qpsk modulator? whether the power consumption will reduce if the qpsk modulator implemented in fully digital domain? tq -asraf-
I'm trying to modulate a random antipodal signal sampled at 4 symbols per second, but I can't seem to write the code right in matlab. I'm using the command: modem.qammod to create a handle for my modulator, but I keep getting the error message:??? Error using ==> modem.abstractMod.checkModInput at 35 Input X must be an integer-valued doub
I have an assignment on mobile communications and it's on Matalab and I need some help on some of the components that make up the code. I need to create a component that generates information bearing bits from the binary set {0 1}. Every 200 bits should form a frame. Also, I need to create a qpsk modulator that maps two binary bits to (...)
HI FRIENDS, I AM DOING MY MTECH PROJECT ON PI /4 qpsk modulator AND DEmodulator ..... PLZ SEND TUTORIAL ON PI /4 qpsk modulator AND DEmodulator ..... .......PLZ SEND VERILOG CODE FOR PI /4 qpsk modulator AND DEmodulator TO MY (...)
Given 2 modulating message signals (I and Q): SI(t) = 0.5 sin(2pie 10t) + sin (2pie 20t ) SQ(t) = 0.7 sin (2pie 15 t) + 0.3 sin( 2pie 25t ) carrier frequency , fc = 500 Hz sampling frequency, fs = 63 kHz using qpsk modulator What is the matlab coding for the simulation to obtain the plot of the amplitude spectrum of the modulated signal (
I need to implement the following: 1. BPSK modulator + Racian Fading Channel + AWGN +MMSE Equaliser + BPSK Demodulator 2. qpsk modulator + Raleigh Fading Channel + AWGN +Zero Forcing Equaliser + qpsk Demodulator I need to implement in MATLAB to study their performance. I would (...)
Hi Everbody, I need your help I am not good at matlab/simulink, My Problem is about Multipath Rayleigh Channel BER Calculation in Simulin/matlab. BER Results are for the below cases; Generating Data:Bernoulli Binary Generator Modulation:qpsk modulator Channel:Rayleigh Fading and AWGN Equalizer:LMS Based Equalizer Demodulation:qpsk (...)
Hi, We can create qpsk easily. For that first you have to know the process then collect the formulas. One by one you can execute through matlab. Defferent plotting comments are present in Matlab. seeing this in the command window type- help plot then different plot comments will appear and you can use any one based on your needs.
hello there...can any1 help how to plot 1)continous n sampled of i n q signals 2)I and Q modulated signals 3)qpsk signal 4)Amplitude spectrum of qpsk signal. hope someone can help me to solve dis important
Imagine this communication system: Bit Generator+DSS Spreader+qpsk modulator --> AWGN Channel ---> qpsk Demodulator+Despreader. The spreader converts a 4 bit sequence into a 32 chip sequence. So each bit is represented by 8 chips. One interesting thing is to plot the BER(Eb/N0) of the qpsk modulation (...)
Hi all! Basically my project is a bit generator+spreader+modulator --> demodulator+despreader. A 4 bit sequence is converted to a 32 chip sequence by the spreader. If I use a qpsk and without AWGN channel, I get 0 BER before and after the despreader. However when I use the MSK (or Oqpsk) and I add the delay (...)
I am working on a communication based project(diversity reception in wifi&wimax) (did a grave error of not choosing my strong area of controller) I am shocked to know that i am very weak in the basic level. Struggling hard to implement BPSK,qpsk modulator demodulator in matlab. can anyone help me out in anyway? i'll be thankful if u (...)
I need qpsk modulator and demodulator block but it is not there in optsim block mode . Is there any way to create those blocks?
Hi, i try to implement a qpsk modulator using simulink. This is a expected result of the modulator where im using a qpsk block in As for my own build here is the model of the qpsk block. But there is an error at Root Raise
hi all.. i've written a VHDL code for qpsk modulator but there seem a little part that i dont know how to debug it. i cant enable to write the input into RAM. the things is i separate the input to inphase and quadrature and want to store it into two RAM. could anyone help me ?. here i attach the top level design, 2 ram and two LUT. i dont know w
Hi everyone, I am working on qpsk modem. Can any one suggest me how to use NCO as modulator for my project (atleast outlines are welcome).This i have to make it for variable data rates. regards, pavan
How to generate our desire input instead using Random generator as input source? Can teach me pls? i try to use a desire 8bit input source instead of random generator block for qpsk modulator.
Hello every body...... I have a doubt in Dqpsk demod. In any qpsk/Dqpsk modultor transmitted signal is COSINE(fc+(2i-1)*pi/4); We are using Dqpsk modulator and needed to demodulate the data......... we are using non choherent demodulator. Can any one help in non choherent (...)
Hello every body In qpsk modulator block where do we use raised cosine filter for shaping the signal. I would be glad if any body give me the detailed block diagram of qpsk modulator Thank you
Hi everyone: can anyone help me to write a modulator-demodulator scheme for qpsk, Oqpsk, and MSK in AWGN channel in MATLAB? Thanks
Guys, I need your advice regarding my work at school. I need a good book that talks about qpsk modulation techniques from a hardware perspective. Like describes the circuits for the modulator. I dont care for the Transmitter, the modulator is enough. Also the demodulator is enough from the receiver side. If you (...)
I would like to plot the spectrum of a qpsk and 8PSK modulated signal. The carrier frequency is 5GHz and the symbol rate is 500KS/s. Could you give me some clues to plot the spectrum? Thank you very much for your help Julien,
I have to design a qpsk modulator for DVB-H in Simulink . I have looked at DVB-T example in simulink and understand little bit . Could anyone help me with this. Regards
Plz if any one could reply & help me about a matlab code for the digital communication BPSK qpsk 16 QAM just help me give me ideas or hints something like that
Some application gen on how to use COREGEN HDL code generator for qpsk design is available in the following link good luck
hi all , i am doing qpsk modulator and demodulator on simulink but there's a problem : the output on scope begins after 10 seconds not from 0 seconds this happens when connecting the blocks of the modulator together but when placing the pulse generator alone with the scope the output begins from zero so what (...)
hello guys, i have got to simulate BPSK & qpsk modulator with AWGN in Matlab WITHOUT using simulink. I need your help guys.A code would really help.Thanx in advance.
Hello, It is possible to simulate qpsk modulator with the ENVELOPE or with the PTOLEMY. Do you have license for that ? Tell me what do you prefer and i will send you sample in EMAIL.
Hi. you can use simulation in matlab. In this, there are the m-psk block and qpsk block. U can set the options for your purpose. I attached these blocks for you. with regards.
hi it is stated here that in a qpsk system the highest fundamental frequency present at the data input to the I or the Q balanced modulator is equal to one-fourth of the input data rate how could this be true? although it is stated also that "the bit rate in either the I or the Q
hi there, I am doing an asignment regarding using HDL to build a qpsk modulator. I only knew that psk is differentiate from how many phases is using but i have no idea how it can it differentiate by using channel. 1. Can i know what it means by single channel qpsk modulator?DOes it refer to how many bit is the input (...)
I made a qpsk modulator with max2510,I AND Q derive from ad9763, I AND Q 10MHz; LO 350 MHz . Problem:spectrum 340MHz AND 360MHz are equal ,and 350 MHz 20dB below than 340MHz and 360MHz. but theorily 340 and 350mhz are about 40dB below than 360mhz. addachment is my SCH. THs!!
Hi, all, I am plan to design a modulator and Demodulator chip with a CMOS process for the application of IEEE 802.15.4(Zigbee), my question is, 1. which modulation should I choose, GFSK, qpsk or sth else? 2. which kind of MoDem should I choose, Digital or Analog? Thank you!
Digital or Analog modulator and Demodulator? Hi, all, I am plan to design a modulator and Demodulator chip with a CMOS process for the application of IEEE 802.15.4(Zigbee), my question is, 1. which modulation should I choose, GFSK, qpsk or sth else? 2. which kind of MoDem should I choose, Digital (...)
Hi, all, I am plan to design a modulator and Demodulator chip with a CMOS process for the application of IEEE 802.15.4(Zigbee), my question is, 1. which modulation should I choose, GFSK, qpsk or sth else? 2. which kind of MoDem should I choose, Digital or Analog? Thank you!