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30 Threads found on Qpsk Power
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?
Let me clarify something. Tye adavtage of O-qpsk over standard qpsk is that the evelope of the band-limirted modulated signal has much less variations. This allows the use of nonlinear high power amplifiers in the transmitter without high spourious generation level. Theoretical performance (BER vs. Eb/No) is the same. Regards Z
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 (...)
The essense of normalization is that you get the maximum = 1, and all other values are below it. I'm not sure but maybe the point of constellation are placed in such manner to keep the average power equal for all modulations. For example, split your 16-qam picture into four quadrants. The centers of them correspond to qpsk, and so on.
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 -
hai there, im verifiying my qpsk architecture and quit confuse on whether to choose SNR or Eb/No in the AWGN block. is there any difference between SNR and Eb/No to obtain BER? what is the difference if there are?
i am trying to differentiate the mpsk modulation using power spectrum i.e., by observing the tones in the spectrum.. so after the power spectrum, i am trying to further classify the bpsk,qpsk and 8psk by applying the power spectrum to lpc...such that by observing the coefficient data(setting some threshold) i can classify (...)
For SSPA, there are several definitions for linear output power. For example, the output power at which IM3 is better than -25 dBc is regarded as linear power. Some people use definition from ACPR test with qpsk or Oqpsk modulation. That is output power at which ACPR is better than -30 dBc.
Hi dionysian, There is no spectral line at the carrier freuency in qpsk. For qpsk, the more common methods are: - 4th power loop: the idea is to obtain a spectral line at the 4th harmonic using a 4th order ninlinearity. This can be accomplished squaring the signal, filtering and squaring again. This component can be used for locking a (...)
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-
Hi all, I want to generate a qpsk signal to drive my power amplifier. Please tell how to generate a PWL as the input signal. Thanks. Best Regards, whlinfei
Hi, I am doing power amplifier design. In many PA papers, qpsk is considered as a non-constant envelope signal. But from its waveform, it seems it's constant-envelope. Some books say the filtered qpsk is non-constant envelope. Even in that case, how is the signal demodulated given that the demodulator simply times the singal with (...)
Hi, I am doing power amplifier design. In many PA papers, qpsk is considered as a non-constant envelope signal. But from its waveform, it seems it's constant-envelope. Some books say the filtered qpsk is non-constant envelope. Even in that case, how is the signal demodulated given that the demodulator simply times the singal with (...)
I don't know much about simulink, but at a glance I think it is because of "Input signal power" setting in AWGN model you used are set to constants. When doing IFFT, there is multiplication with 1/N_FFT (inside IFFT function) which attenuate the signal amplitude. Because this attenuation, noise power can be too high for OFDM qpsk system. (...)
The offset-qpsk with half-sine pulse shaping modulation selected for the 2.4 GHz PHY is equivalent to minimum shift keying (MSK), which is a constant envelope modulation scheme. This allows the use of simple, low-cost and relatively non-linear power amplifier designs. I hope it can help. Mazz
hello every body I would like to know the difference in transmitted power for qpsk-OFDM Transmitter and qpsk transmitter in same conditions Does qpsk-OFDM system requires more power tha n qpsk system??? Regards
first Same MEAN power (1/2 of ones's and 1/2 of zeros'), Amplitude equal for all waveforms (ASK, FSK, PSK, etc) then compare things: ASK detector have one branch. Noise in only one branch. Mean power FSK detector have two branches. Noise in two branches. 2xMean power PSK detector only one branch. Noise in only one branch. 2xMean Po
How to measure Eb/No of qpsk with spectrum analyzer???
That is correct. qpsk is a harder to implement due to the 45 degrees phase difference between quadrature components. it is preferred to use a IQ modem So in conclusion, they are both the same theoretically but the implementation is different. I'd prefer QAM as I said. you do not have to implement the 45 degree phase shift in both transmitter and re
I am looking to simulate the average signal power of BPSK,qpsk,16QAM,64QAM modulated signal using Matlab/Simulink. Is there a way to do this. Do libraries already exist thst does this. Any pointers/ideas?
Note that Wimax does not use *only* OFDMA. It could use also BPSK or qpsk if the OFDMA in 256QAM can't (pure and simple) be used...
The DC power assumption is 8mW, how to achieve a 31dBm output power? According to his spec, I guess he want 4dBm output power used for Bluetooth Class 2. Since Bluetooth 2.0 adopted qpsk & 8PSK, so the linearity should be carefully considered, 3~4dB backoff from P1db may be necessary. Hi there, I believe your output (...)
1. For P2P microwave link, first you should know what type the signal is: FSK/qpsk/16QAM/64QAM/128QAM/256QAM/CDMA..., 56M/28M/14M/7M/3.5M etc. And estimate the receiver signal level by link budget. 2. Abouthow to program it, you can refer Microwave Office Examples, there are many examples about 128QAM/16QAM BER calculate. BER has some relation w
ebno=10.^(ebno_index/10) is not convert noise power in dB to normal value noise=sqrt(1/ebno)*randn(1,100) % for BPSK this assumes that your signal power is 1. sqrt is because noise variance (=power) becomes k^2 if the signal is multplied by k. in the complex case (qpsk), the power has to be (...)
its urgent !please guide me that what class of power amplifier should i design for the qpsk modulation in S band and the application is on board satellite?and please also mention the reason.
Hi dspbegin, it depend on channel limitation and complixity of implimentation. but about chennel constrant this cases can be noted: Interference limitation (sp. multiuser) => CPM (e.g. GMSK) power limitation (sp. in fading channel)=> qpsk Bandwidth limitation (sp. cable channel and MW links) => QAM regards
First of all the power class of the amplifier is dependable by the type of the modulation that is transmitting. AM modulation and some types of digital modulation (BPSK, qpsk, OFDM, QAM, etc) requires linear amplification, and the PA shall be in a linear class (A or AB). FM modulation and some types of constant envelope digital modulation (FSK, G
I see application in pi/4-shifted qpsk demodulator which need to compare received signal in phase difference. Also in oscillator circuit without require external clock source for low power consumption.
The selection between various class of Amplifiers is highly dependant on the modulation scheme requirement, as an example qpsk modulation modulation does not require highly linear Amplifier hence could be implemented in a higher efficiency topology. Hope this helps Rgds