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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: 297
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
rf microwave tools part 1 - part 64
9705-1.pdf diode model parameter extraction from manufacturers data sheets9708-1.pdf pin diode model parameter extraction from manufacturers data sheetsdbm.zip displays rf power and voltage realtionsnetwork.zip either an ac network anal...
RF, Microwave, Antennas and Optics :: 29 Jul 2009 6:14 :: sivanandyala :: Replies: 5 :: Views: 5549
need info on a homemade probe for 14 ghz measure emf/emi
ghanistan and working with the us army where we have some concerns the emf field intensity at ku-band 14 ghz might be too high for some people working near a parabolic antenna. i have a good hp 4407b spectrum analyzer to work with but do not have a e...
RF, Microwave, Antennas and Optics :: 26 Jun 2009 13:33 :: CCH1957 :: Replies: 12 :: Views: 738
interpretation of pll simulation results
helloi made a simulation of the pll. its parameters are:reference freq: 3.9 mhzoutput freq in lock: about 308 mhzfreq divider ratio: 79charge pump current: 25uai used three state pdf/cp and 2nd order passive loop filter.i simulated close loop phase n...
Analog Circuit Design :: 25 Jun 2009 12:07 :: jas2005 :: Replies: 5 :: Views: 441
second order rlc circuit
why is overshoot seen in second order rlc circuit in underdamped case? please explain me physically....
Electronic Elementary Questions :: 11 Jun 2009 10:04 :: FvM :: Replies: 3 :: Views: 558
need matlab help!!
can anybody help me in making bandpass filter which will pass frequencies between 925 to 970 mhz , and after that pass a square wave in this filter and then check the output frequencies(using fft) and plot the output waveform???thanks:d...
Digital Signal Processing :: 30 Apr 2009 13:36 :: bt87 :: Replies: 13 :: Views: 930
multi-instrument 3.0 --- fully functional 21-day free trial
product website:http://www.virtins.comdownload pc version: http://www.virtins.com/misetup.exe download pocket pc version: http://www.virtins.com/pocketinssetup.exehttp://www.virtins.com/img/scmianim.gifhttp://www.virtins.com/img/pocketinsprobeanim.gi...
Software Links :: 12 Apr 2009 6:45 :: webhopper :: Replies: 5 :: Views: 1558
microstrip line & envelope simulation
hii would like to get your opinion about the result and accuracy of envelope simulation of microstrip lines. is it allowed or not?hb is ok regards to simulation with microstrip lines but envelope...?thanks in advance for your helphttp://images.elektr...
RF, Microwave, Antennas and Optics :: 09 Apr 2009 19:01 :: VSWR :: Replies: 5 :: Views: 597
odd order of hilbert transform question?
hi all, i have a baseband signal 0hz~48khz, and sampling rate is fs = 1.536mhz, i need to mix this base signal to if, which is about 384khz, but when doing mix, i do not want the double-side-band (dsb) signal but single-band-signal (ssb), so i will c...
Digital Signal Processing :: 31 Mar 2009 8:31 :: xie.qiang :: Replies: 0 :: Views: 129
audio spectrum - need help with the matlab code
hi,i am trying to analyze the spectrum of an audio .wav file which was recorded by someone else.the .wav file has two tracks in it, so i just used one of them. the sampling rate is indicated in the file properties as 44 khz.i wrote the matlab code as...
Electronic Elementary Questions :: 28 Mar 2009 21:19 :: FvM :: Replies: 3 :: Views: 345
overlapping carriers of ofdm technique....
hi all! we know ofdm subcarriers overlap each other, is this condition in time domain or frequency domain?could somebody explain me more with details? i appreciate!thanks a lot!...
Digital communication :: 12 Mar 2009 9:32 :: gayathri123 :: Replies: 2 :: Views: 228
interview questions on dsp - open thread - please contribute
hi,most of you mustve already passed that interview stage and some others could be the interviewers themselves. so, i thought this thread should be helpful to everyone and anyone who is not just attending an interview but wants to know more about dsp...
Digital Signal Processing :: 02 Mar 2009 10:25 :: Communications_Engineer :: Replies: 61 :: Views: 12883
need you assistance in building my concepts.
hi friends...i just have started studying digital signal processing....i need to make following concepts clear....please help me out...1: when we take frequency spectrum of a signal..why we get an image frequncy?2: if we take freq spect of a time dom...
Digital Signal Processing :: 05 Jan 2009 7:27 :: xulfee :: Replies: 4 :: Views: 429
high performance ssb system design technical questions
hello all,i design a high performance ssb system for sw that i could also use for upconversion to 10ghz.i am using the filter method with an if of 500khz.i have two identical ssb filters of 501.650khz, bw 2.7khz, which are ok for ssb voice operation ...
RF, Microwave, Antennas and Optics :: 30 Dec 2008 22:09 :: vfone :: Replies: 7 :: Views: 774
question about basic ac measurement using oscilloscope
1.what is the purpose of the http://www3.ntu.edu.sg/home/askklee/scope/digital_photos/zacdcgnd.jpg coupling switch in a cro?2.what levels of precision and accuracy are obtainable from the cro when it is used to measure frequency?3.compare the precisi...
Electronic Elementary Questions :: 18 Oct 2008 17:21 :: Sahara :: Replies: 9 :: Views: 2868
where can i fabricate microstrip and help with genesys
hi there,im designing a microstrip filter circuit as part of my final year engineering project. im located in new zealand and im wondering if anyone can help me point out companies that might be able to fabricate it. preferably in the australasian re...
RF, Microwave, Antennas and Optics :: 23 Sep 2008 2:45 :: selva500 :: Replies: 40 :: Views: 1557
high efficiency ingan based quantum well solar cell
i want to understand the physics of semiconductor where can i find useful tutorials...
Electronic Elementary Questions :: 09 Sep 2008 8:30 :: KhangKhang :: Replies: 38 :: Views: 5445
need help on subband filter
i need a paper shown below.simulation of filter structures for fixed-point implementation bailey, d.a.; beer, a.a. system theory, 1996., proceedings of the twenty-eighth southeastern symposium on volume , issue , 31 mar-2 apr 1996 page(s):270 - 274 d...
Digital Signal Processing :: 18 Aug 2008 18:20 :: yan105 :: Replies: 0 :: Views: 105
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frequency drift in pll design
i have designed a pll for 4000mhz output using a 20mhz ref from ocxo with synthesizer adf4106. loop filter is passive.i use a divider to get three 20mhz refs. one connects to oscillator scope, the second one is for pll ref and the third one connects ...
RF, Microwave, Antennas and Optics :: 18 Aug 2008 14:26 :: FvM :: Replies: 15 :: Views: 1245
image filter
hi all,do anyone know about image filter? how to design the image filter?do anyone can share these articles or books?i search a couple of days in internet, but cannot find the related information.thanks in advance!...
RF, Microwave, Antennas and Optics :: 29 Jul 2008 16:18 :: RF-OM :: Replies: 7 :: Views: 288
rfid 13.56mhz power amp design
hi all. i wish i had found this forum a little sooner. im trying to design a rf power amplifier to work at 13.56mhz. im trying to amplify the transmit power from a texas instrument trf7960 reader ic. i want an output power of 8 watts to power up an a...
RF, Microwave, Antennas and Optics :: 26 Jul 2008 22:52 :: FvM :: Replies: 15 :: Views: 1560
frequency spectrum on wavescope
hi,im having trouble trying to plot a frequency spectrum on wavescope (a scope from xilinx used in system generator)...its always a time axis....cant change it to frequency...how can i plot an fft or instance on this wavescope to show frequency respo...
Digital Signal Processing :: 27 May 2008 8:56 :: salma ali bakr :: Replies: 0 :: Views: 66
rc & lc circuits
can anyone help me in getting material for rl and rc circuits and its analysis for basic understanding or advice me any book that have lot of rc,rl, transistor circuits and its analysis and different source conditions.thanking in advance,cheers,panka...
RF, Microwave, Antennas and Optics :: 19 May 2008 5:05 :: randell_xtian :: Replies: 2 :: Views: 441
frequency analyzer or spectrum analyzer troubleshotting
when troubleshotting a circuit using a frequency analyzer or spectrum analyzer what can it tell the electronic tech how the circuit it wrong?i use a function generator set at squarewaveform that goes to the input of a circuit, i use the frequency ana...
Electronic Elementary Questions :: 27 Apr 2008 17:51 :: walters :: Replies: 5 :: Views: 243
help!!!
hi friends, please tell me the advantages and disadvantages of fir systems.regards,avinash.s....
Electronic Elementary Questions :: 26 Mar 2008 15:26 :: joe1986 :: Replies: 4 :: Views: 258
about slope compensation circuit
hi, allit is said that the frequency spectrum is not even through a cable, then slope circuit is needed here, so can anybody here explain the meaning of slope compensation circuit for me, and how to use it to compensate the frequency response.thx in ...
Analog IC Design & Layout :: 27 Feb 2008 7:57 :: abcyin :: Replies: 0 :: Views: 99
plotting of fft of given signal
plz help me . refer the following program,....main aim. i want to generate 2000hz frequncy and plotting time and frequncy spectrum for the same. i have got all the result but frequncy plot result is not correct.% calculate datan1=2000;n2=500;t=0:0.1:...
Software Problems, Hints and Reviews :: 20 Feb 2008 17:34 :: halls :: Replies: 1 :: Views: 261
z trnsform
can anybody tell me aboutwhat is the physical meaniing of z transform regards faizalvalayam cusat cochin...
Digital Signal Processing :: 18 Feb 2008 7:44 :: naresh850 :: Replies: 4 :: Views: 345
ac power line spectrum
ave some questions: 1- what is the ac power line(or plug in home users) frequency response?the power is : 220 v-50 hz2- how we can measure the signal and all harmonics, till to existence frequency in spectrum.?3-if i want to extract one of the line h...
Electronic Elementary Questions :: 14 Feb 2008 17:33 :: Sinisa :: Replies: 2 :: Views: 189
relation between sampling frequency and bandwidth
hi,1.what is the relation between sampling frequency and bandwidth when you are using a scope?2.what is the maximum frequency you can measure on a 200 mhz oscilloscope?tia.,regardsdeepak...
Professional Hardware and Electronics Design :: 14 Feb 2008 14:20 :: echo47 :: Replies: 4 :: Views: 297
help on card sound
hi, i would like to know the relationship between the sounding intensity in db and the output voltage of the sound cardthankk you...
Software Problems, Hints and Reviews :: 06 Feb 2008 14:18 :: Foufou :: Replies: 14 :: Views: 437
fir filters with complex coefficients
please can someone explain the benefits of a fir filter with complex coefficients, as opposed to one which uses real coefficients? why would i choose a complex fir over a real one? i have seen complex fir filters used occasionally, for example in equ...
Digital Signal Processing :: 31 Jan 2008 15:11 :: dspman :: Replies: 2 :: Views: 148
measuring the electrical length of a trans. line
helloi have a line made out of several components (all quaxial), i measured its attenuation (-13db) , and its physical length.however i must know its electrical length in order to replace it with only one equivalent line.i need to know it only for a ...
RF, Microwave, Antennas and Optics :: 27 Aug 2007 13:48 :: madengr :: Replies: 1 :: Views: 144
dsp processor vs microcontroller
what is the difference between dsp processor and microcontroller?...
Electronic Elementary Questions :: 13 Aug 2007 3:31 :: springf2000 :: Replies: 10 :: Views: 6135
attenuator for spectrum analyser ??
how can i interface my equipment delivering an rf power of around 100w, to a hand held spectrum analyser(rohde & schwarz fsh series)which is only having a power handling capacity of 100mw. frequency range is around 50mhz.can anybody suggest an approp...
RF, Microwave, Antennas and Optics :: 06 Jul 2007 13:17 :: Eugen_E :: Replies: 3 :: Views: 267
external tracking generator for hp 8590b spectrum analyzer?
does anyone know if and how an external tracking generator can be used together with an hp 8590b spectrum analyzer to measure frequency response of a circuit? i believe the spectrum analyzer must have an if output (which the 8590b doesnt have). if th...
RF, Microwave, Antennas and Optics :: 29 Jun 2007 17:25 :: JohnG300c :: Replies: 0 :: Views: 177
pll spurs
what frequencies are pll spurs located at ?any references for this topic ? for one example, spurs from charge pump mismatch....
Analog IC Design & Layout :: 26 May 2007 2:26 :: zeloyu :: Replies: 8 :: Views: 798
asic operating frequency to support wirelesss applications?
hi, to suppport wireless applications, what is the range of operating frequency for asics? and also what r the factors design factors involved in choosing operating frequency? pls let me know..thank®ards,mrk...
Digital communication :: 11 May 2007 14:35 :: bulx :: Replies: 4 :: Views: 366
cmos digital logic inverter
what is a cmos digital logic inverter how do u construct it...
Electronic Elementary Questions :: 12 Mar 2007 16:00 :: dineshbabumm :: Replies: 7 :: Views: 771
pwm
hi,can any one tell what is pwm? and its application...
Electronic Elementary Questions :: 03 Mar 2007 8:17 :: sonal :: Replies: 9 :: Views: 810
capacitor in series with a light bulb
hi!i just would have a simple question:i connect a capacitor and a light bulb all in series with dc power supply and gnd.i have learned that capacitor in series with the dc voltage blocks the voltage.then why should the light bulb light up for a mome...
Analog Circuit Design :: 26 Feb 2007 18:15 :: Kral :: Replies: 10 :: Views: 327
duality theorem
what is practical use of duality theorem?...
Electronic Elementary Questions :: 17 Feb 2007 23:55 :: abel51 :: Replies: 9 :: Views: 246
high frequency operation of op amps
hiwhats the frequncy above which we consider op amp to work as high frequency device. if 1khz signal is fed as input to an op amp, will it be considered as high frequency operation??wating for reply...
Electronic Elementary Questions :: 01 Jan 2007 16:52 :: sonubkk :: Replies: 10 :: Views: 231
white color detection
hi folks,i am looking for a ic or sensor to distinguish white color from other colors. any suggestion.thanks,ricky...
Robotics and Automatics Forum :: 28 Dec 2006 11:23 :: ricky_wcy :: Replies: 6 :: Views: 528
fir filter in matlab
i just designed an fir filter in matlab, and saw the impulse response. i obtained a low pass filter. up to now there were no problems. i read the cut-off frequency(0.144cycles/sample) and had 2 null frequencies at 0.325cycles/sample and 0.5cycles/sam...
Digital Signal Processing :: 01 Dec 2006 8:45 :: Robinenemy :: Replies: 3 :: Views: 270
for a signal does freq spectrum change with time ?
hi, i know that for a given signal, there exists a corresponding freq spectrum. but im am baffled by my thought. can somebody explain this: imagine this time domain signal: 10*sin(wt)u(-t)+5sin(wt)u(t)..i.e.sinusoidal signal is at one amplitude for...
Digital Signal Processing :: 18 Nov 2006 15:13 :: mahdithdn :: Replies: 1 :: Views: 141
finding the frequency response of a quantized filter!!!!!!!
hi folks i have designed a bandpass filter and quantized it.(16bit input,16 bit coefficients and 16 bit output data-cd quality). now i need to verify the filter response on how much it is deviating from the unquantized response. can i feed in a noi...
Digital Signal Processing :: 13 Oct 2006 9:12 :: wwfhm2002 :: Replies: 1 :: Views: 138
saw filter frequency response verify
hi, allrecently i have a project that use two saw filters in rf board, but i want to know impedance matching of these filters. how do i verify that ?thanks,...
RF, Microwave, Antennas and Optics :: 17 Sep 2006 14:43 :: brumi :: Replies: 3 :: Views: 210
what is ofdm?
what is it, and why is everyone so excited about it?...
Electronic Elementary Questions :: 15 Aug 2006 20:12 :: bauer :: Replies: 12 :: Views: 1704
what is impulse response ?
could anyone explain about impulse response of a linear system?is that can be stated as transfer function, h(t) ?...
Electronic Elementary Questions :: 04 Aug 2006 11:34 :: hlasy :: Replies: 31 :: Views: 1665
can dsps replace most of analogue circuits ??
can dsps replace most of analogue circuits of the past times ?? what are the constraints ?? no of bits used to represent 1 sample ?? sampling rate ??...
Electronic Elementary Questions :: 02 Aug 2006 17:35 :: bauer :: Replies: 11 :: Views: 498
spectrum analyzer and power meter questions
i have used spectrum analyzer to measure the 900mhz osc power output and compared with rf power-meter output, there are always has about 5dbm difference between them, which one should i trust? is it possible that my spectrum analyzer needs calibrat...
RF, Microwave, Antennas and Optics :: 15 May 2006 5:30 :: abc123 :: Replies: 12 :: Views: 531
one question about matched filter in digital receiver!
im confused by raised-cosine-rolloff function. if the received signal is bpsk, whose symbol-shaped pulse is rectangular, what the matched filter should be? thanks for your attention!...
Digital communication :: 24 Apr 2006 15:21 :: zorro :: Replies: 1 :: Views: 399
why we need to go for frequency domain signal analysis
can any one tell me what is the requirement of frequency domain ,when we have time domain signal analysis...
Digital Signal Processing :: 23 Mar 2006 9:52 :: tamerakshar :: Replies: 2 :: Views: 174
falling of light in photo diode and transistor
where the light should fall in photo transistor..in emitter base junction or base collector junction?for photo diode, whether it is junction or anywhere other than junction...?so what is the best point for better efficiency for photo diode and trans...
Electronic Elementary Questions :: 13 Mar 2006 19:11 :: hiyan :: Replies: 2 :: Views: 177
vco phase noise from biasing circuit problem
hi,i am designing a vco and find that the phase noise from the biasing circuit contribute almost the same big phase noise. the biasing circuit include some current mirrors to supply the tail current source bias. anyone has advises to decrease the bia...
RF, Microwave, Antennas and Optics :: 28 Feb 2006 6:10 :: springf2000 :: Replies: 10 :: Views: 681
inverse fft and impulse response with matlab
i have a measured truncated spectrum and i want to know the corresponding impulse response. how should i do?i padded the data with zeros and created the complex symmetric spectrum from these data to have a real signal when applying the ifft. but. res...
Digital Signal Processing :: 07 Feb 2006 12:31 :: MSGHP :: Replies: 3 :: Views: 426
question about mixers' output spectrum
why in an output spectrum of a mixer (if port),the component (vrf-vlo) is greater in amplitude than the component (vrf+vlo)is it right or must be equal ?...
Electronic Elementary Questions :: 26 Jan 2006 1:14 :: nxing :: Replies: 3 :: Views: 159
digital storage oscilloscope
hi,could anyone recommend me a better deal than this one (price: usd $149.95):the pcs100 is a 12mhz 1 channel digital storage oscilloscope, using a computer and its monitor to display waveforms. all standard oscilloscope functions are available in th...
Hobby Circuits and Small Projects Problems :: 16 Dec 2005 15:16 :: hugo :: Replies: 0 :: Views: 330
fir filter limitations (or not) ?
hello,i am quite new to the field of digital fir filters (i always worked with the old-fashionned analog ones, but i digress). there is an important aspect to fir filters that eludes me: a low pass digital fir filter filters out all frequencies in ...
Digital Signal Processing :: 05 Dec 2005 19:13 :: claudiocamera :: Replies: 9 :: Views: 639
antenna and generator question
hello,a generator gives a 100 volts output in 3 secondes and it connected to an dipole antenna (assuming no loss in connection). what will be the fequency of this output that can radiated this maximum energy? because a dipole its lenght is lamda/2 ...
RF, Microwave, Antennas and Optics :: 04 Dec 2005 11:08 :: jian :: Replies: 3 :: Views: 180
how to using fft to study the power spectrum?
s time points of a sine-likewaveform. from this wave, i can approximately re-construct some sample points by assuming a sine wave connecting two adjacent time points.then i use fft to study its power spectrum. assume the c......
Digital Signal Processing :: 04 Nov 2005 13:29 :: neoflash :: Replies: 8 :: Views: 693
noise measurement: needed shielded room??
dear all, in the industrial, will they measure their rf circuit in the shielded room in order to get all the figure of merits ( 1-db, iip3, power gain, nf etc.)? or, just use shielded room to measure all the noise parameters? or, just measure all...
RF, Microwave, Antennas and Optics :: 04 Nov 2005 12:21 :: dushan1 :: Replies: 4 :: Views: 189
non linear optic
can anyone help me to understand the fundementals of nonlinear optic...
RF, Microwave, Antennas and Optics :: 15 Sep 2005 13:29 :: kle :: Replies: 3 :: Views: 252
any reading material about polyphase filter?
basic concept and its applications?thanks...
RF, Microwave, Antennas and Optics :: 04 Sep 2005 11:00 :: eejli :: Replies: 17 :: Views: 939
how can i generate thefrequency response diagram in proteus?
hi everybody plz help me. i want to calculate the input impedence of a circuit at many frequincies. how can i do this using proteus 6.7??? can i generate a grapf for the frequency response using the proteus too???? if not. could anyone suggest anothe...
Analog Circuit Design :: 30 Aug 2005 16:30 :: Iain :: Replies: 1 :: Views: 618
transistor bias
hi there, please help me with this question, there is many method to bias the transistor, for example voltage divider bias, collector feedback bias, emitter bias, base bias, etc, please tell me when should we use the most appropriate of these type of...
Analog Circuit Design :: 27 Aug 2005 6:43 :: zhi_yi :: Replies: 10 :: Views: 1071
question about network analyzer-pc interfacing using gpib
90-915mhz and 935-960mhz) from a hp8753d/e network analyzer to a pc via gpib, and then generate the time domain response in the pc using ifft. i have the following question: 1. can i get frequency spectrum data from the na via gpib? is the......
RF, Microwave, Antennas and Optics :: 22 Jul 2005 20:53 :: sergio mariotti :: Replies: 1 :: Views: 357
loop gain analysis
hi, i am trying to do a plot the loop gain frequency response of the non-inverting amplifier configuration by using the method suggested in http://www.spectrum-soft.com/news/winter2001/loopgain.shtm. the dc gain that i got is closed to 0. did i bre...
Analog Circuit Design :: 15 Jun 2005 8:03 :: pseudockb :: Replies: 0 :: Views: 204
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