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42 Threads found on Cordic Fpga
I would also add cordic algorithm and look-up table (optionally with linear interpolation) to the candidate list. Of course it doesn't matter if you are using Verilog or a different hardware description method.
Ok, I see the problem: zi = zi - cordic_iter; xi = xi - (yi / 2.0**i);//cos yi = yi + (xi / 2.0**i);//sin In the third line you are using the new value for xi, it should be the old value.
i need verilog code of sine wave generator....i tried with cordic algorithm but i cant able to proceed....plzzz help
hi sougata 1) the design i have used before can be applied for regular LDPC and also can be applied for irregular column LDPC . 2) as i remeber the any algorithm of BP can be applied for regular and irregular LDPC . 3) we didnt use cordic to over come the floating point and tanh calculation we have make our floating point representation acc
Hello Dears Does anyone implement "arcCos(x)" function by cordic? I did it by Taylor series, but I don't know how to do it by cordic. Regards Mostafa
Look at this Also, most fpga vendors have cordic modules; some are free.
Hello Dears Could you please tell me which one is better for implementation of "arc Cos(x)" in VHDL?(Also, better for implementation on real hardware(fpga)) 1_ Using Maclaurin series ( attached fig ). 2_ Using "cordic" method. 79271. Regards Mostafa
I read about FFT . there are several ways. Pipeline, Radix, cordic ... But i want a good comparison between them.
i m using 512 point FFT IP core in V6 fpga to calculate the frequency of the input signal, i m getting the correct peak and amplitude for the same . the peak's real and imaginary value i have to give to the cordic ip core(atan) to get the phase of the input signal . the input to the fft is a 10 bit samples from adc in 2's complement format the ou
Hallow, I need for finiche my these by title:"fpga implimention of Qam modem with cordic" , i need a code source for FIR and DAC, thanks
Hey, guys! I have been written the PMSM controller these days , and have to implement the space vector PWM /Field oriented control algorithm on fpga. It's said that some modules of SVPWM could be implemented through cordic algorithm, like Park transform and Clark transform.Has anybody ever been involved with the algorithm implementation on (...)
There's some code involved like CIC filter, FIR filter, IIR filter ,cordic algorithm and FFT in the book "Digital Signal Processing with Field Programmable Gate Arrays".Hope it would be helpful.
Instead using cordic generate sin wave with DDS. Then during input signal change change the phase of the sine wave by reading from different location. This works. I've done this. vhdl4u gmail com
cordic is often used to rotate complex vectors, and very rarely is used to convert matrices. It was obviously useful when hardware multipliers were comparatively heavy. Now when the floating point cores are usual things it would be better to implement the usual algorithm to find eigen value of matrix using the floating point calculations.
a cordic core may be available from fpga's manufacture
If you need synthesizable verilog then you can use a LUT, cordic processor, DW component, etc. If it doesn't need to be synthesizable I usually use a Taylor series.
Check for cordic Algorithm... It helps you to implement exponantial functions. implementation of cordic is quite simple, I think...
I am trying to implement Arcsine function using cordic methods. I am following the method given in "A surevey of cordic algorithms for fpga based computers" by Ray Andraka. (paper attached). For the method described, I tried using x0 = 1 (since the paper says we start with a unit vector on x axis), y0 = 0, and z0 = 0. I am getting an (...)
I am doing my project on fft implementation using cordic algorithm......when we put it for synthesies its taking 12-15 hours to pls tell me wats the problem......the problem will be with our code or something else........
Hi, see the attachments on cordic used in Micro processor and basic cordic structures for fpga implementation
Hello. I am not too experienced with fpga, but in a new project I feel there are no way around. I use a Blackfin DSP (ADSP-BF533) running at 500MHz, and need to equip it with hardware acceleration for geometry functions (cordic). My thoughts are wiring up the fpga (a Xilinx Spartan-3, XC3S1000) on the Blackfin data/address bus, where (...)
Tr to search for cordic algorithm
Has anyone tried to implement the Hough Transform (HT) for image processing using fpga??? I've read it is possible by means of cordic algorithm for its capability to implement trigonometrical functions Any suggestion about????
i need fast mul using adder with cordic algorithm in fpga.
for what purpose cordic algo. is used ?
hi, anyone can give me idea about algorithemic accelaration using fpga:?: argently needed about this.....
Hi iam implementing an algorithm onto fpga in which i need to evaluate standard deviation where i need to find squareroot.i though tof using cordic.but i need to convert real number to std_logic.plz mention the ways to implement this or provide code if anybody had it. thanks in advance
I thought the stages in SDR were: 1.Convert RF to IF. 2.ADC 3.DDC (look at redriver), LPF 4. IQ demodulation using cordic or some sort of LUT. you should look at gnuradio that would give a more detailed description.
Who can give a suggestion of documents or implementation issues on cordic algorithm? Thanks a lot.
see following book : "DSP with fpga" as comment , cordic unit have 3 modes,circular,linear and hyperbolic.this depends on how u initialize ur parameters in unit(i.e. m=-1 or m=0 or m=1) in circular mode u can calculate square root .....(see relevant articles) GoodLuck
OK! Sine and cosine generation is an old problem, usually solved using look up tables, specially when the frequency of sine and cosine waves are fixed. if the frequency is variable and you should compute a different sine or cosine value each time, then you should compute it and as our friends say cordic can do the work. As you know Xilinx provid
Sure. Check h**p:// It has very nice explanations on cordic implementation for fpga. Ace-X.
Hello all, Can sqrt(x) realized by cordic in fpga, or can power(x,n) be realized by cordic? Regards, Davy Zhu
How can I find a good book for cordic algorithm Thank in advance
Req. For cordic algorithm tutorial
At this link: you will find intersting stuff on cordic and fpga. This is a a doc on " fpga Implementation of Sine and Cosine Generators Using the cordic..." Regards, --rs
Hi every body, I am looking for verilog code for matrix multiplication (not involving the use of a cordic core cause that would take alot of space on the fpga.............I mean is it possible to have a code without cordic core used.........) .........if any one knows about it then kindly message me Aircraft Maniac
Hi all, I need help on how to implement LOGRITHMIC in fpga without using cordic. I thought of a very crude method of having a rough look up table method and then using Newton Raphsons Method to approximate the values....... does someone have a better idea which also occupies lesser logic . Aircraft Maniac
How to program a VHDL to implement demodulation of AM, FM, PM, PSK, QPSK, PCM, FSK, ASK, CDMA.. on fpga (Xilinx) could anybody give me some advice, cordic or some other algorithms are appreciate, thx in advance.
What is cordic?
An interesting cordic paper: