| Search found 1019 matches on edaboard.com: frequency spectrum frequency spectrum matlab frequency spectrum spectrum frequency response matlab frequency spectrum |
need matlab code or codes able to simulate ofdm
dear all ; i have work as a telecommunication engineer. i have been making research and preparing thesis regarding with ofdm and its applications for my work . to understand ofdm more and more, i want to simulate it with matlab. if it is possible, co...
Digital communication :: 19 Nov 2009 21:48 :: Aya2002 :: Replies: 2 :: Views: 300
log amp (ad8319) output issue - how to invert?
hello everyone,im working on a system that accurately records (4) points along the rising edge of the envelope of an rf pulse. it must be able to accomplish this goal over a wide bandwidth. to do this, i decided to use the ad8319 log amp, and use th...
Analog Circuit Design :: 19 Nov 2009 16:16 :: Zangetsu57 :: Replies: 5 :: Views: 201
second harmonic in gsm(900)
in gsm 900, the gsm modem i am using has a radiated second harmonic more than -30 dbm (violates etsi). testing the modem revealed that the conducted second harmonic at 1800 was -42 dbm. my antenna gain at 1800 is 3 dbm. i am not sure where the 9 db g...
RF, Microwave, Antennas and Optics :: 19 Nov 2009 15:52 :: Wilson_yu_chen :: Replies: 8 :: Views: 807
order role in harmonic balance simulation
what is the means of order parameter in harmonic-balance simulation? from where i know set this parameter to what value for my simulation? if it be smaller is good or be larger?...
Analog IC Design & Layout :: 19 Nov 2009 10:16 :: kspalla :: Replies: 3 :: Views: 96
psoc in wireless sensor node
hi all, i am a new designer in psoc.i want to design a wireless node that contains analog input signal connected to psoc microcontroller which should connected by serial max 232 with a wi-fi modulator.can anyone help me ?...
PLD, SPLD, GAL, CPLD, FPGA Design :: 17 Nov 2009 19:57 :: jczarne :: Replies: 7 :: Views: 612
deleted from topic number 370918 mod pranam77
rsatile and easy-to-use device ideal for professionals in the catv industry.this rugged signal level meter covers a broad range of applications:it measures and displays signal amplitude at a specific frequency or any carr......
Trashcan :: 16 Nov 2009 5:04 :: gaoinstruments03 :: Replies: 0 :: Views: 21
matlab, how to get frequency spectrum?
hi all,i am a matlab newbie :)how to get frequency spectrum of a vector data? (something like [3 4 2 10 ...])i heard fft is the time-frequency fransform. and i tried fft() function in matlab.but it return a complex number. is it stand for both freque...
Electronic Elementary Questions :: 15 Nov 2009 18:42 :: Aya2002 :: Replies: 27 :: Views: 19305
matlab programing + gaussian finction
hi guys this is my first time in here but i think this is an wonderful site so i have decided to share with you my experiance in matlab, i will be posting certian programs in matlab and u can ask me anything you want to know. i will later tell you wh...
Digital communication :: 12 Nov 2009 7:20 :: Communications_Engineer :: Replies: 95 :: Views: 13939
working with rfm12b by avr and bascom
hi.im working with rfm12b by avr and bascom.i have a problem with it.after 3 month i just can initial it and i can see the spectrum of the radio frequency that it make on spectrum analizer.but i can not send any data.i mean because it use fsk modulat...
Digital communication :: 11 Nov 2009 11:46 :: elec1363 :: Replies: 0 :: Views: 69
radiated emission from quartz
hi guys,im new here and i am asking your suggestion to solve a radiated emission problem thats afflicting a device i am working on.i am facing high radiated emissions from a quartz running at 20 mhz frequency (checked that the quartz was the emitter ...
Professional Hardware and Electronics Design :: 10 Nov 2009 19:24 :: FvM :: Replies: 3 :: Views: 90
how to simulate ac characteristics of a sc cmfb op?
hi all,i have designed a sc cmfb fully differential op. but i can not simulate the open-loop ac characteristics of it?could you help me?thanks ahead!bestken...
Analog IC Design & Layout :: 10 Nov 2009 12:47 :: newtoanalogdesign :: Replies: 3 :: Views: 414
fft & ifft in ofdm
elementary questions, hope u guys dun mind..i often see 1024 point or 1024 bin length fft & ifft for ofdm. at first i thought 1024 represents the number of subcarriers for ofdm, but i later realized it wasnt. so what does 1024 represents?and what is ...
Digital Signal Processing :: 10 Nov 2009 6:36 :: varunknp :: Replies: 11 :: Views: 1716
about connection of the filter and vco in pll design
hi,i am working in a Δ-Σ fractional-n frequency synthesizers, i have a question about the connection of the filter and vco in the circuit. the varactor of the vco is amos as shown in fig.1, the vtune voltage is directly connected to one por...
Analog Circuit Design :: 10 Nov 2009 6:36 :: mmic1978 :: Replies: 31 :: Views: 1952
sampling frequency from sampling period
hellohow to find the sampling frequency fs from a given wave or signal??thanxregardsadnan...
Digital Signal Processing :: 08 Nov 2009 21:06 :: Mynul :: Replies: 4 :: Views: 294
matlab simulink application that fits the following specs
hello. i am a newbie in matlab simulink. my professor gave me some specifications and parameters and my task is to find suitable application/system to be simulated in matlab by using simulink. below is the specs he gave:input freq: 12khztransistion b...
Digital communication :: 07 Nov 2009 8:22 :: imonline888 :: Replies: 0 :: Views: 78
mtalab magnitude/frequency spectrum viewer
i am newbie to matlab.i have vector of digital samples ,i need to psd-plot the samples continiously playing like movie with given baseband frequency . i can plot samples using plot(abs(vector)) but how to play it slowly like a moving graph/ecg ...
Digital Signal Processing :: 07 Nov 2009 2:13 :: rohit2600 :: Replies: 0 :: Views: 87
mc-cdma simulation in matlab (chaotique sequences)
i need to simulate mc_cdma using matlab,exacte costruction of chaotique sequences in mc-cdma systems .please help....
Digital communication :: 06 Nov 2009 17:48 :: Aya2002 :: Replies: 19 :: Views: 501
simple quesiton about spectrum analyzer
i have a simple question about the spectrum analzyer.is it used to measure the power spectrum density(psd), so the measure output unit should be dbm/hz or w/hz?but it seems the real world spectrum analyzer output is dbm. so how can it convert back to...
RF, Microwave, Antennas and Optics :: 05 Nov 2009 17:14 :: biff44 :: Replies: 3 :: Views: 129
matlab program for sfdr!
hi all,i am trying to simulate adc for sfdr,snr,thd and sndr. the matlab code is attached as below. i am new in matlab and couldnt fully understand the program.to simulate, i input low frequency sinewave signal and the adc is running at 50ms/s. shoul...
Analog IC Design & Layout :: 04 Nov 2009 2:34 :: euniceliu :: Replies: 6 :: Views: 3309
low rate sub-noise communication ideas?
hi, im looking for low rate (9600bps will be ok) wired (coax cable) communication in frequency range ~20-60mhz. the main requirement is that communication should be spread-spectrum and noise-level, i.e. noise floor can be slightly higher but narrow-r...
Digital communication :: 03 Nov 2009 13:26 :: akorud :: Replies: 0 :: Views: 33
hy we need t coherent sampling to calculate snr in n-adc's
dear all,in n-adcs why we need to follow coherent sampling method for calculating snr.bye....
Analog Circuit Design :: 02 Nov 2009 18:21 :: coolstuff07 :: Replies: 2 :: Views: 96
matlab code for rayleigh fading channel
can some one help me with matlab code for rayleigh fading channel .thank you...
Digital communication :: 27 Oct 2009 22:57 :: thewinner :: Replies: 4 :: Views: 2871
help to analyze fft spectrum
hi,there is a phenomonen that i dont understand about the fft spectrum. i just executed a fft spectrum of the output of an ideal dac which is connected to adc under test.as you can see below, my fundamental signal (inpu signal) is 2 mhz and is the lo...
Digital Signal Processing :: 27 Oct 2009 20:00 :: FvM :: Replies: 1 :: Views: 156
swinging signal on spectrum analyzer
oduction vehicle trying to downlink a ku signal. i was not able to tune it in so i checked my spec an to make sure the transponder was up. what i found was that my signal was drifting side to side (frequency, not amplitude) at a rate of about twice...
RF, Microwave, Antennas and Optics :: 27 Oct 2009 3:05 :: biff44 :: Replies: 2 :: Views: 117
tektronix 2710 spectrum analyzer
hs ago, it was in very good conditions and perfectly working:d.two days ago i turned it on and a i saw this message on the display cannot count phase lock vco:cry:.now many nomalyzations fail and the frequency values displayed are not true.somebody ...
Service Manuals, Requests, Repair Tips :: 25 Oct 2009 1:37 :: Gary N :: Replies: 3 :: Views: 378
fundamentsl of wireless communicaions
hi friends,i need the solution manual of the book fundamentals of wireless communications by david tse.please forward it to me.please . please i need it badly.thanx...
Digital communication :: 23 Oct 2009 7:01 :: Communications_Engineer :: Replies: 8 :: Views: 2898
why use pll inside a spectrum analyzer?
hi to everyoneive a question for a skilled user, ive to design a superheterodine (100mhz 2ghz) receiver with an up conversion at 3ghz ad one down conversion at 50mhz . ive to use two vco from minicircuits but ive read that it be used with pll to hav...
RF, Microwave, Antennas and Optics :: 22 Oct 2009 9:18 :: vfone :: Replies: 1 :: Views: 159
spur!!!amplifier when input 192mhz bandwidth qam256 signal.
when input 192mhz bandwidth qam256 signal, there is some spur frmo 40mhz to 120mhz. the input signal frequency is 189~381mhz,32channel, power level is -39dbm per channel. the amplifier is aca2407. why?thanks!...
RF, Microwave, Antennas and Optics :: 21 Oct 2009 16:52 :: fnx7 :: Replies: 2 :: Views: 162
local ossilator - drop of data with sytnhesizer
hi ,here is my situation.in my system if i used my synthesizer i can see drop data.if i replace synthesizer with signal generator i can not see any data drop. is there a possiblity that lo loose it syncronization?some power line at 220v ac is in same...
Professional Hardware and Electronics Design :: 20 Oct 2009 19:46 :: Element_115 :: Replies: 3 :: Views: 186
signa integrity book for pcb designers
i read this at si-list and thought that it may be useful for the pcb designer. i am reproducing it.i have 50 copies of my book signal integrity for pcb designers available from my publishers. i am offering these books at price of $25 at amazon under ...
PCB Routing & Schematic Layout software & Simulation :: 20 Oct 2009 12:23 :: dehati :: Replies: 0 :: Views: 243
bandwidth transmitted signal and lowpass equivalent signal
hi,i have simple question.i think it is basic concept for digital communication.however, im a little bit confusion on this.maybe, im missing some point.in many books, when the bandwidth of lowpass equivalent signal is b, the bw of the transmitted sig...
Digital communication :: 17 Oct 2009 9:16 :: Gemini1706 :: Replies: 3 :: Views: 240
ADS
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noise & electronic ballast - 100hz vs 400hz
recently i found out some noise, at about 100hz, on the scope when i placed the probe of channel-1 to one end of a coil and the gnd-probe to another end of the coil. before that i did not have such noise problem, which has been haunting me since few ...
Electronic Elementary Questions :: 16 Oct 2009 13:04 :: FvM :: Replies: 5 :: Views: 264
how to change matlab command
hello everybody...can i ask something...how ca i change this command to display the magnitude spectrum??this command has show low pass filter.. case 1 if(wp>ws) handle=errordlg(wp must be less than ws for lowpass filter,guifilter_...
Digital Signal Processing :: 14 Oct 2009 1:17 :: awanis :: Replies: 0 :: Views: 120
lte channel vs transmission vs occupied bandwidth?
dear all, from the 3gpp document, i find three terms: (1) channel bandwidth, (2) transmission bandwidth and (3) occupied bandwidth. from the 3gpp document stated that channel bandwidth=1.4mhz. then the transmission bandwidth configuration nrb=...
RF, Microwave, Antennas and Optics :: 12 Oct 2009 10:55 :: wccheng :: Replies: 0 :: Views: 123
coaxial cable - velocity of proppagation issue
how could the velocity of propagation affects the performance of signal transmission ?...
RF, Microwave, Antennas and Optics :: 09 Oct 2009 15:55 :: flatulent :: Replies: 1 :: Views: 99
algorithms for signals processing - request for resources
hello!i need to implement some algorithms for:1. lpf,hpf,bpf filters2. coherence between signals3. frequency spectrum4. autocorrelogramin c++ programmingif you know some libraries or algorithms that can help me,or if you have some ideas to help,pleas...
Digital Signal Processing :: 03 Oct 2009 11:19 :: DoraSzasz :: Replies: 0 :: Views: 120
cdma vs gsm
whta are the main differences between the tow systems...
Digital communication :: 01 Oct 2009 7:05 :: usmani :: Replies: 15 :: Views: 2457
may be some one make use of this topic
sampling---------------------------converting an analog signal to a digital one is a necessary step for a computer toanalyze a signal: modern computers are digital machines, and can store only digital values.in the continuous function x(t), we replac...
Digital Signal Processing :: 28 Sep 2009 18:57 :: Aya2002 :: Replies: 12 :: Views: 2228
about this speech recognition using fpga
i found this link of using speech recognition using neural network and fpga.http://www.courses.cit.cornell.edu/ece576/finalprojects/f2008/pae26_jsc59/pae26_jsc59/index.html .it provides the main code in c as below :my problems are how to find out the...
Digital Signal Processing :: 27 Sep 2009 18:42 :: farhada :: Replies: 1 :: Views: 252
how to use aditional mean value in fft matlab????please help
help please!!!!i have sinwave with 0.1 v amplitude and 1khz frequency mixed with 5v white noise.i used fft in matlab to simulate. 1-(study the use of additional mean value calculation of every data set of fft spectrum and how it affects the visibilit...
Digital Signal Processing :: 27 Sep 2009 13:19 :: program2 :: Replies: 0 :: Views: 168
utran protocol stack... quick help needed!!!
hi!well, i need to know the uu (umts radio interface) interface protocol satck. ive studied it, but im a little confused. i know, it works at physical, data link and network layers of osi model.i want to know, what exactly are the responsibilities of...
Digital communication :: 26 Sep 2009 9:23 :: oldandfool :: Replies: 7 :: Views: 711
dft x(k) frequency spectrum is not what was expected
hi,can someone tells me how x(k) change f we doubled the sampling freuqency...
Digital Signal Processing :: 25 Sep 2009 13:47 :: awanis :: Replies: 14 :: Views: 459
ofdm with qpsk (matlab simulation code required)
hi,can i get a matlab simulation code for ofdm implementing qpsk modulation..its urgent plz,,,,...
Digital communication :: 24 Sep 2009 9:51 :: puripong :: Replies: 6 :: Views: 1530
question about third order intermodulation product
n about the third order intermodulation product (ip3).i understand that for two single tone signals at f1 and f2, the ip3 appears at 2*f1-f2, and 2*f2-f1. but if those two signals are modulated, with frequency f1_low~f1_high, and f2_low~f2_high, what...
RF, Microwave, Antennas and Optics :: 24 Sep 2009 6:26 :: kspalla :: Replies: 3 :: Views: 244
cst microstripes 2009 v.8
http://www.ziddu.com/download/6577196/cst.microstripes.2009.v8.0-null.rar.html...
Software Downloads/Uploads :: 22 Sep 2009 9:15 :: ans :: Replies: 0 :: Views: 348
need help to implement this matlab code to calculate sfdr..
does anyone have implemented the codes below?im thinking that i put a sine wave as input of my 8-bit adc and take directly the output of my adc..am i right?and lastly how the file test.load look like or how is the arrangement of the data inside? this...
Analog IC Design & Layout :: 21 Sep 2009 15:39 :: kickbeer :: Replies: 2 :: Views: 432
gsm jammer
well as a small project one of my frnds wanted to design a gsm jammer circuit.what wud be the requirements for such a design. he wanted to know more abt this ckt.. is it possible to jam cdma signals.. as per my knoledge gsm operates at low power so i...
Hobby Circuits and Small Projects Problems :: 15 Sep 2009 18:39 :: AKSHAYVH :: Replies: 65 :: Views: 30185
antenna loading effect
ng effect of antenna?and how to solve it?for example,a monopole was put in handheld application, but there were earpiece, lcd ... i found the input impedance of the monopole was incresed and resonant frequency was shifted. one more important discover...
RF, Microwave, Antennas and Optics :: 15 Sep 2009 7:34 :: vfone :: Replies: 5 :: Views: 333
fft scope in simulink
hii am simulating rfid in simulink i want to add frequency spectrum at each point but unfortunately i am getting the same error at every point in the model.the following model is giving me an error at fft scope. the error is continuous sample times ...
Software Problems, Hints and Reviews :: 12 Sep 2009 20:24 :: hanif :: Replies: 1 :: Views: 372
help on fft - where it is used, links to its uses
hi friends,sorry for a strange question, but can anyone tell me where fft is used?i think it would be useful for all the beginners in digital signal processing.please everybody, give, maybe, some links or say (in two words) where you implemented your...
Digital Signal Processing :: 11 Sep 2009 17:07 :: Communications_Engineer :: Replies: 4 :: Views: 554
how to determine sfdr, snr, sndr of adc with ltspice
hello,the standard sfdr is 48dbc. what does it mean, when sfdr is higher than 48dbc or lower than that value?thank you very muchregards,kickbeer...
Analog IC Design & Layout :: 10 Sep 2009 20:56 :: kickbeer :: Replies: 11 :: Views: 774
what is noise shaping?
hi,please help me understand the concept of noise shaping :d1- what is noise shaping?2- what is first-order noise shaping?3- what is the difference between first-order noise shaping and second-order or third-order ... noise shaping?4- can anyone desc...
Analog IC Design & Layout :: 04 Sep 2009 14:07 :: tdy :: Replies: 4 :: Views: 360
what component is this?????
can anyone tell wat type of component is this. if possible can u also pls give the link for the datasheet..(sorry about the picture clarity)..pls helpthanks....http://img54.imageshack.us/img54/3096/photo0009.th.jpghttp://img132.imageshack.us/img132/7...
Electronic Elementary Questions :: 03 Sep 2009 23:01 :: barrybear :: Replies: 6 :: Views: 288
pls tell method for power factor measurement
hello,i wish to know the how to find power factor for 1-phase voltage and current wave forms with different loads,kindly reply,thank you,...
Electronic Elementary Questions :: 03 Sep 2009 21:14 :: Kral :: Replies: 6 :: Views: 447
detecting audio frequency from very few samples
hi all,i am diving into the world of dsp by attempting to write a program to capture sstv images. i have figured out how to do a spectrum analysis to detect the peak frequency of a block of samples using fftw, but that requires a fair number of sampl...
Digital Signal Processing :: 03 Sep 2009 16:54 :: cspencer :: Replies: 4 :: Views: 261
mobile standart analization...
hi everybody!could somebody explain me principal working of cdma2000 mobile standard and gsm system?in cdma2000, do all phones use same frequency? what about in gsm, there is a sim card and does one sim card has a its own frequency?pls explain me mor...
Digital communication :: 31 Aug 2009 2:25 :: wireless2009 :: Replies: 3 :: Views: 334
real time removal of sinusoidal baseline artifact
hi alldoes anyone know an analog technique to remove a sinusoidal baseline from an input signal before the adc? the sinusoidal baseline is 16khz and is significantly larger than the real signal which is 16+ khz to 30mhz. a high pass filter is an opti...
Analog Circuit Design :: 28 Aug 2009 18:01 :: LvW :: Replies: 5 :: Views: 331
power spectrum unit: vrms or vrms^2 - which one is correct?
a signal is attached to channel-1 of an agilent 35670a dynamic signal analyzer. the unit of the signal measured by the analyzer is as follows:time capture (time domain): volt (v)linear spectrum (frequency domain): volt-rms (vrms)power spectrum (frequ...
Electronic Elementary Questions :: 27 Aug 2009 22:43 :: ark5230 :: Replies: 2 :: Views: 205
pwm output spectrum
you please lead me to some good references which deals with calculation of output spectrum of a pwm-modulated signal. 2)i want to know how to take fft of a pwm-modulated signal, since it has infinite frequency components and there can be fft-artefact...
Analog Circuit Design :: 27 Aug 2009 13:03 :: hobgoblin :: Replies: 1 :: Views: 297
3g!!!
today what would be best??gsm or cdma??...
Digital communication :: 15 Aug 2009 9:11 :: akswami :: Replies: 28 :: Views: 1839
problem while using cadence calculator dft
hi there,i am trying to measure my 10 bits adc enob.my input signal is 7.5khz sine wave, sampling frequency is around 552khz (required by application). and output is the sampled data through dac (written in veriloga, no filter).first, i selected my i...
Analog IC Design & Layout :: 12 Aug 2009 0:08 :: JoannesPaulus :: Replies: 9 :: Views: 597
few clarification on snr/sndr calculation
hi all,i need some clarification on calculating snr/sndr.i did cadence simulation of a sample and hold circuit and then took the fft of the output. ( i did that keeping in mind the proper method of dealing sample data ffts)now i want to calculate the...
Analog Circuit Design :: 11 Aug 2009 23:58 :: rmiguel :: Replies: 3 :: Views: 522
wire---frequency
what is the frequency range of a basic wire (i mean a wire with insulated pvc for example)?dc to xxxx hz?...
RF, Microwave, Antennas and Optics :: 08 Aug 2009 12:25 :: FvM :: Replies: 10 :: Views: 363
noise corner frequency - spectre
hello,i would like to know if there is a simple way to get the value of noise corner frequency for a mosfet in cadence spectre simulatorthank you for your help!...
Analog Circuit Design :: 08 Aug 2009 0:07 :: mbyoussef :: Replies: 3 :: Views: 369
diy swr bridges
hello!can please someone point me to interesting literature about the construction and building of swr bridges like that one used in combination with network analyzers and spectrum analyzers with tracking generator?cu...
RF, Microwave, Antennas and Optics :: 07 Aug 2009 7:26 :: Sheldon :: Replies: 8 :: Views: 2841
how to measure the out psd by spectrerf?
hi,im designing a pa.i want to know the out psd of it and the bandwidth is 3g-10g.would you like to tell me how to do that by spectrerf? thanks!...
RF, Microwave, Antennas and Optics :: 07 Aug 2009 3:32 :: fuser1972 :: Replies: 6 :: Views: 321
does upsampling or downsampling change the frequency content
hi ppl,does ups ampling or down sampling a signal change its frequency content.since up sampling increase the number of zero valued samples in the signal i think it should decrease the dc content of the signal. and again as up sampling increaseboth t...
Digital Signal Processing :: 06 Aug 2009 9:48 :: Petre Petrov :: Replies: 7 :: Views: 881
time<->frequency conversions and displaying in matlab
hii know that to convert to frequency domain i need to do the fft and ifft to convert to time domain.but how to display it right in matlab? suppose that i generate signal in time/frequency domain and need to convert to frequency/time domain.---------...
Digital Signal Processing :: 04 Aug 2009 11:39 :: kafentz :: Replies: 1 :: Views: 318
what is the concept auto scan frequency in mobile?
how does a auto scan frequency in mobile fms work?i mean how does the auto scaning fequency in mobile stops to scan when it catches the freq. signal which is strong enough. what is the concept behind it...?can similar concept could be used to detect ...
Analog Circuit Design :: 03 Aug 2009 16:04 :: akshay_d_2006 :: Replies: 2 :: Views: 228
the reason of emi problem of dc-dc ?
i have emi problem at about 100mhz, i do not known the reason? is because of the rise time of sw node, or the ring of the sw node, in a dc-dc converter chip? anybody can help me , thanks a lot!...
Analog IC Design & Layout :: 01 Aug 2009 19:05 :: nadigsharma :: Replies: 4 :: Views: 273
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