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207 Threads found on Qpsk Modulation
Hello all, Please could someone confirm this. In a satellite link design i have specified a bandwidth of 80MHz. My modulation scheme is qpsk. I have then stated that since qpsk is capable of transmitting 2 bits per hz (??), the link can achieve a data rate of 120Mbps. Is this fundamentally correct ? Or am i missing something obvious (...)
i have an exercise & i need some explanation to understand whats going on . LTE in the 2600 MHZ band , how can we calculate the the DL max bit rate on modulation qpsk coding 1/2 ===> DL bit rate 10 MHZ BW & on 20 MHZ BW on modulation 64QAM coding 3/4 ===> DL bit rate 10 MHZ BW & on 20 MHZ BW Can you please explain to me how to (...)
Good evening. I am simulating a MIMO channel, but I have a doubt about adding noise. I am measuring the BER vs EbNo, but Matlab function AWGN requests SNR. I already know that SNR = EbNo + 10log(spectral efficiency), but I don't know what spectral efficiency is while transmiting 4x4 mode with qpsk modulation in each channel. The whole system eff
Most senior members should explain simple concepts and comparison of BPSK,qpsk,QAM and FSK techniques.Also how to find number levels in QAM?
a new in ADS , i want to modulate an RF signal with qpsk modulation,i have a configuration problems about stream bitstream ,symbolRate,V_peak signal power any one can help me please?
Hi I guess, that since there are 4 constellation points in qpsk and these are far apart. A quite large EVM can be tolerated. However with 64QAM the constellation points can be quite close and therefore, there is no room for a large EVM. Regards
If x∈{exp(j2pil/L|l=0,1,...,L-1}^M, x is transmitted qpsk signals, M is transmitting antennas L=4 is the modulation level. I need to get the formula of x for 4-QAM, 8-QAM, 16-QAM and 64-QAM.
hello everyone, I have used convolutional encoding with qpsk modulation using AWGN channel. During decoding if the signal to noise ratio is less than 5 like 1, 2 etc. It shows error i.e. ??? Error using ==> vit Invalid input for chosen decision-type. Allowed input values for hard-decision decoding are 0 and 1. But if keep
Hey, I am trying to implement a polyphase filter bank for a multicarrier transceiver. I want to realize it with qpsk modulation. I managed to get it work with QAM with a input structure for the IFFT as followed: \begin{bmatrix} 1 & i & -1 & -i \\ -i & 1 & i & -1 & \end{bmatrix} It means that each subcarrier is orthogonal to th
can someone give me matlab code for comparison of various modulation techniques i.e. bpsk, qpsk, qam etc.
Hi, In qpsk after serial to parallel conversion do we need to apply DAC in each channel? or simply apply digital signal to the analog signal ? thanks
BPSK uncoded is inefficient use of BW if there is "Ideal Matched Receiver" By using coding methods e.g. RLL codes (link below) you can get lower BW and better BER or use high modulation levels eg 128QAM/qpsk for higher
hi i want to design qpsk and 16QAM modulation using ADS. i must see spectrum and EVM. who can help me. i dont know what i must start and find component. please help me
I have built an OFDM transceiver with rayleigh channel using standard PDP's Like EPA,EVA and ETU.The problem is I am getting very high BER even for BPSK i.e 50-60 % or higher bits in error.Scatterplotting confirms OFDM transceiver blocks include: ---- Random Data -- modulation(BPSK,qpsk,QAM) -- Serial2Parallel -- IFFT -- CyclicPrefix >>>
u look into the report, code and result.. i hope it is useful..
1) how can i alter this code in order to plot it in qpsk ber modulation? 2) how can i alter this code if i wanted to do 3x3? % Script for computing the BER for BPSK modulation in a % Rayleigh fading channel with 2 Tx, 2Rx MIMO channel % Zero Forcing equalization clear N = 10^5; % number of bits or symbols Eb_N0_dB = ; % mul
Hi All, I need to work on a qpsk simulator to show modulation and demodulation using excel. Can you someone give me some idea how to deal with the AWGN noise? Thx!
wat is O-qpsk modulation .i already studied about oqpsk method. but i forget the concept . pls anybody answer this. Advance thanks to u.:|
Looking for a matlab code for ber simulation in wcdma over awgn channel, the code computes ber for a given data rate using qpsk modulation and a pulse shaping filter
I am a PhD student, I work on digital modulations (CSK, DCSK, CDSK, qpsk, BPSK, QCSK ...), I work mostly on digital modulations based on chaos. However I am in blocking state for more than ten days in my work, I can not get a good BER in my simulation of CDSK modulation. for information, i work with simulink and matlab. Can (...)
I know the formula for data rate is Data rate = Symbol rate * modulation Index * FEC * RS Factor; Mod Index is 2 for qpsk , and for 8PSK it is 3. Please tell me is there any additional information is required for calculating Accurate Data rate for 8PSK related to FEC. Regards, Kranthi.
Hi Can anybody help me with code for qpsk modulated OFDM. I have developed the code for qpsk modulation but I am unable to use "reshape " command to perform serial to parallel conversion. I have used reshape with BPSK but it is giving error for qpsk. If anybody can please explain me how to perform the serial to parallel (...)
For satellite? It`s qpsk , some crazy trying QAM.
Plot of ber vs ebno for qpsk in rayleigh channel using the object rayleighchan changes for each simulation. Why does this happen? My code is as follows: % Create Rayleigh fading channel object. chan = rayleighchan(1/10000,0); % Generate data and apply fading channel. M = 4; % qpsk modulation order hMod = modem.pskmod('M', (...)
I m trying to simulate bpsk modulation in matlab using random bits......for qpsk I hav got the not getting any solution for BPSK....if any one replay I will be beneficiary.
I want give a seminar presentation on qpsk modulation. As an introduction I want to say something about the need for qpsk modulation. Somebody please help me.. :smile: Thanks in advance Aleena
hi, i had done plot graph BER cooperative communications with using QAF (Quantize-Amplify and forward) protocol..i use bpsk modulation and 4 level quantization..please tell me how to use qpsk modulation with 16 level quantization..the matlab code as below..actually i dont know this code right or not, so please correct and help me..thank you (...)
Hello to all RF people out there. My knowledge of RF is somewhat flawed so, here's a theoretical question for you: My understanding is that qpsk modulation will produce a constant envelope output waveform if the symbols are shaped as square pulses. As soon as you apply a different pulse shape (e.g. by filtering symbols with a Root-Raised Cosi
Hello guys, Please brief the F-qpsk technique. Regards cam
Hi all, I'm in dire need of the matlab code for BER of ofdm with MRC receiver over rayleigh fading channel for different modulation scheme such as BPSK, qpsk, M-QAM. If u have those, plz send to me: Thank u in advance.
Hi, I'm in dire need of the code for BER evaluation with BPSK,qpsk and M-QAM modulation for ofdm, if u have it plz send at
Hello for every body>> - what's the typical value of qpsk Bandwidth?? or how we can calculate the bandwidth of qpsk modulation (Formula of qpsk bandwidth) - How we can calculate the bandwidth of GEO satellite??
hi all,, i want to ask you about downlink user bit rate. how to calculate bit rate 384kbps in WCDMA??if the spreading factor (sF)=8 and use qpsk modulation= 1/2?? i was read in one of blog that give information about that. i need your help..thx
I think the modulation technique may be various, but nothing conceptually new - guess OFDM, qpsk, nQAM and that is all. I think physical layer now reaches its limit and the further quality of service improvement can be based only on upper OSI levels optimization.
hello friends, I worked on qpsk and 8psk also. Now I am learning ofdm. I understood the concept of ofdm. But How to make an ofdm symbol for one example like data sequence data rate 12mbps modulation qpsk sampling clock rate 24mhz ifft 64 point. pilot symbols and length of cyclic prefix as your wish. Can anybody pos
Generally if we want to calculate bit rate we use Bitrate=Baudrate*Number of bits per symbol. So for a generate PSK or ASK it'd be Bitrate=Baudrate, for qpsk it'd be Bitrate=2*Baudrate, for 16 QAM it'd be 4*Baudrate. But in OFDM we use multiple modulation schemes like BPSK,qpsk,16QAM and 64 QAM. In such case with what should we multiply the (...)
Hi Experts, I need some information on plotting the constellation diagram of a qpsk or 16 QAM or any other modulation. I have the qpsk I and Q samples in an excel sheet. Can i plot the constellation diagram with raw I and Q samples alone? I know we can use MATLAB to check this out.But is there any other alternate to do it for (...)
Is there anyone who can help me by providing the matlab codes for qpsk & bpsk modulation in riccian channel to find the ber vs snr ? Plz , it z too urgent
Hello I want to ask you friend what is the NCBPS(number of coded bit per symbol) and how we can get it if we have Ndsc(number data subcarrier)=100;and code rate 1/2;and qpsk modulation Regards,
How to detect the phase of a sine wave in qpsk modulation? Is it possible to do it using cordic or dds coregen(xilinx) modules?
It means that the complex valued modulation symbols obtained as a result of the modulation scheme block (qpsk< 16-QAM, or 64-QAM) are mapped to resource elements in the 2D time-frequency resource grid. Suppose that the UE is assigned 1 resource block for transmission. That is 12 resource elements that can be used during one OFDMA symbol (...)
what is the peak power and the average power and the difference bet. them for all modulation techniques like ASK,FSK,BPSK,qpsk,8PSK,16PSK,QAM,MSK ???? Easy. You can calculate easily. Find the maximum peak power and divide it with average power. For example, BPSK (+1 and -1) is equal to one!
I am writing a thesis on using G3-PLC for power line communications, whereas the G3 standard uses D/qpsk modulation. What I have figured out so far is that both 4QAM and qpsk appearently produces the same waveform, but are they the same matematically? In a qpsk constellation, are the mapping points at 45, 125, 225 and (...)
Help me, please...... I tried to make a simulation how a system with no diversity goes trough Rayleigh channel. I used qpsk modulation. But the performance graphic looked so bad (I mean, it was not like a "waterfall". It had no pattern at all). The fading model ran well on system with MRC. But not with single input single output. Does anyone know
hi every one i am happy to join this forum please i have two question 1- in dvb-t / Mapper: the digital bit sequence is mapped into a base band modulated sequence of complex symbols. There are valid modulation schemes: qpsk, 16-QAM, 64-QAM,256-QAM . what is the frequency of this modulation ? .....Mhz 2- OFDM (...)
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Hi, I?m looking for a Power Amplifier for WLAN 802.11p applications. My requirements are: Frequency band: 5.9GHz; modulation: OFDM (BPSK, qpsk, 16-QAM and 64-QAM); Output Power (power sent to antenna): 28.8dBm. From the search I?ve done the best options for the Power Amplifier I found are: SE5004L -
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
Hello , I am trying to generate qpsk modulation in Simulink using Matlab function. Attached are the simulink file along with Matlab code. I am stuck in generation of IQ data because simulink call matlab function every time during simulation which results in re-initialization of all variables. Please suggest me solution. Regards
The baud rate is normally set by the requirements of the licensing aurthority as is the modulation - Am/ FM/qpsk/PM ? if you want a serial protocol, you have to specify it your self and then program a processor to generate it. the so called serial protocols have been standardised to allow interchange of data between different manufacturers equipm