Hi all, Interpolation of a sampled signal x(n) to generate an up-sampled signal y(n) can be represented mathematically as: y(n) = x(n/L)...

Hi all, Interpolation of a sampled signal x(n) to generate an up-sampled signal y(n) can be represented mathematically as: y(n) = x(n/L) /* here L is the intrpolation factor. Regardless of the type of interpolation, if we increase the value of 'L' weather it will increase the accuracy of interpolation process? Whats about the fractional Interpolation/Decimation factors how to deal wi...

Hi, I've designed a QPSK bit synchro with Gardner algorithm working with two sample by symbol I've got a Farrow interpolation filter with...

Hi, I've designed a QPSK bit synchro with Gardner algorithm working with two sample by symbol I've got a Farrow interpolation filter with simple linear interpolation If the two input sample of the Farrow filter are 0.5 then 1.0, the interpolation give 0.75 (good) but iof the two samples are 0.75 and 0.75 the interpolation give 0.75 (bad the good interpolation is 1.0) so I think I ...

Dear all, I am thinking of treating nature image like surfaces, suppose somehow there are some missing pixels in this image, and I want to do...

Dear all, I am thinking of treating nature image like surfaces, suppose somehow there are some missing pixels in this image, and I want to do surface interpolation to reconstruct the missing pixels. Which surface interpolation algorithm can do this job best? I hope this surface interpolation approach will be a lot better than bilinear interpolation, or separable interpolation, am I right? ...

Hello to all, Dear i am trying to resample the irregularly sampled data regularly, in order to apply the standard spectrum analysis...

Hello to all, Dear i am trying to resample the irregularly sampled data regularly, in order to apply the standard spectrum analysis techniques on it. For this purpose i am using linear interpolation. But there exist interpolation noise, so kindly tells me the methods to reduce the interpolation noise. I shall be thank full to you for your Help. Regards. Qaisar This message was...

Hello Forum, With reference to FM Gardners article "Interpolation In Digital Modems---PART1: Fundamentals", I have a query regarding the term...

Hello Forum, With reference to FM Gardners article "Interpolation In Digital Modems---PART1: Fundamentals", I have a query regarding the term JITTER. Under the heading "Interpolation Jitter" the author states that " Athough the kth interpolation is computed FOR a time kTi=(mk+uk)Ts, the interpolant is actually delivered coincident with a clock tick no earlier than (mk+1)Ts. Therefore the out...

Hello, I'm supposed to design a transmit chain with a root-raised cosine pulse shaping filter followed by some interpolation stages. The...

Hello, I'm supposed to design a transmit chain with a root-raised cosine pulse shaping filter followed by some interpolation stages. The RRC-filter shall interpolate by 2, and its output shall be interpolated by 8, resulting in a total interpolation of 16. I'm told that the total characteristics of the RRC-filter + interpolation chain shall resemble a root-raised cosine response. I'm ...

I'm looking forward implementing image interpolation in one dimension at once, however I don't really know how to do it. Linear interpolation...

I'm looking forward implementing image interpolation in one dimension at once, however I don't really know how to do it. Linear interpolation doesn't fit me good, I need something better, more like cubic spline interpolation, but the only problem that well implementing it doesn't sound like such an easy thing (I will if I have to, but it definitely won't be my first choice for that precise ...

Hello I'm trying to perform Channel Estimation on an OFDM signal by using various interpolation techniques between pilot symbols. The best...

Hello I'm trying to perform Channel Estimation on an OFDM signal by using various interpolation techniques between pilot symbols. The best method is to implement an interpolation filter (in the time domain, or in the freq domain using FFT). The problem is that in order to achieve a "good" FIR interpolation filter, the filter must be quite long. Because of the long filter length (long ta...

Hi, i would like to know which is the best method for implementing a integer sample rate converter (decimation /interpolation) in terms of...

Hi, i would like to know which is the best method for implementing a integer sample rate converter (decimation /interpolation) in terms of quality. the conversion rates required are (2,4,8,16) both decimation and interpolation.i had tried with polyphase implementation and lagrange interpolation.lagrange interpolation is too spiky and polyphase resulted in flat signal without images. But i wo...

I'm trying to define a couple of common signal interpolation/ resampling methods as a matrix operation, i.e. y = W z where, y is the...

I'm trying to define a couple of common signal interpolation/ resampling methods as a matrix operation, i.e. y = W z where, y is the interpolated data vector of dimension m x 1 W is the interpolation matrix of dimension m x l z is the original data vector of dimension l x 1 I've worked out W for linear and nearest neighbour interpolation (easy) and I was wondering if more c...

After considering a couple of advices and suggestions for upsampling techniques here, I finally converged to use the cubic interpolation technique...

After considering a couple of advices and suggestions for upsampling techniques here, I finally converged to use the cubic interpolation technique to estimate the voltage values corresponding to intermediate samples present between the original or previous samples. I know that spline interpolation is basically used for getting smoother curves, but what makes it different from the normal cubic inte...

Hi all, As I know there are two interpolation method: 1. As many DSP book said, pading (L-1) zero points into space between...

Hi all, As I know there are two interpolation method: 1. As many DSP book said, pading (L-1) zero points into space between two primitive samples, then lowpass filter it. Then we get the result. 2. linear cubic langerange interpolation. What is difference between those two method? Which has better performance? As my understanding first method alwa...

Hi, I need an interpolation between 2 points, where I can specify x1,y1,x2,y2 as usual and also derivatives at both ends. I need it to be...

Hi, I need an interpolation between 2 points, where I can specify x1,y1,x2,y2 as usual and also derivatives at both ends. I need it to be computed fast and accurate. It should be an interpolation with minimal (or small) curvature. Example: we have 2 staight lines in X range 0..4 and 6..10. I want to fill the interval 4..6 with a smooth curve joining both of them. My first idea was to use ...

Hi all, My project is Digiatal Sampling correction Interpolation/Decimation for application in flexible OFDM Modem. I'm implementing in Matlab...

Hi all, My project is Digiatal Sampling correction Interpolation/Decimation for application in flexible OFDM Modem. I'm implementing in Matlab the 5_taps optimized interpolator which will improve the performance for long data OFDM bursts. I used control parameters basepoint index (m(k)) and fractional interval (mu(k)) (reference to FM Gardners article "Interpolation In Digital Modems---PART1: ...

Hi all, My project is Digiatal Sampling correction Interpolation/Decimation for application in flexible OFDM Modem. I'm implementing in Matlab...

Hi all, My project is Digiatal Sampling correction Interpolation/Decimation for application in flexible OFDM Modem. I'm implementing in Matlab the 5_taps optimized interpolator which will improve the performance for long data OFDM bursts. I used control parameters basepoint index (m(k)) and fractional interval (mu(k)) (reference to FM Gardners article "Interpolation In Digital Modems---PART...

I am using Matlab's mfilt.cicinterp on a piece of data. Out of curiousity, I also tried to write my own CIC interpolation filter. I referred...

I am using Matlab's mfilt.cicinterp on a piece of data. Out of curiousity, I also tried to write my own CIC interpolation filter. I referred to Hogenhauers original paper (An Economical Class of Digital Filters for Decimation and Interpolation) as well as Matlab's documentation for mfilt.cicinterp at http://www.mathworks.com/access/helpdesk/help/toolbox/filterdesign/index.html?/access/helpdesk/h el

In 2d is there a difference mathematically between a multivariate bilcubic (or bilinear, sinc etc) 'interpolation' and the 'filter' expression...

In 2d is there a difference mathematically between a multivariate bilcubic (or bilinear, sinc etc) 'interpolation' and the 'filter' expression of the same name ? - For example taking the multivariate bicubic 'interpolation' expressed on the wikipedia page: http://en.wikipedia.org/wiki/Bicubic In comparison with a bicubic 'filter' using a weighted sum of values in a sub-grid: http://m...

I had the idea to try interpolation based on KLT. I tried searching for this with 4 search engines and only found one paper that mentions this...

I had the idea to try interpolation based on KLT. I tried searching for this with 4 search engines and only found one paper that mentions this concept in passing, but without a citation. Any ideas where I might find out more about such interpolation?

Hi, I have a datastream that is sampled 4800 times pr second, but the rf front end I am going to use accepts only input at 250000 samples pr...

Hi, I have a datastream that is sampled 4800 times pr second, but the rf front end I am going to use accepts only input at 250000 samples pr second. Clearly I need a 52,0833 times interpolation. To achieve this I have planned to first interpolate 625 times, and then decimate 12 times. I will do this in steps, for instance in steps of 5 for the interpolation, and 4 for the decimation. I...

My receiver comprises the following parts: 1) a 10-bit ADC running at fs (M samples/symbol), 2) a time-domain "interpolation filter" based on...

My receiver comprises the following parts: 1) a 10-bit ADC running at fs (M samples/symbol), 2) a time-domain "interpolation filter" based on a comb-integrator stage with leaky integrator (sampling rate increase by N) does "interpolation" and acts as a dc-blocking filter as well, 3) a Manchester decoder based on a oversampling & counting algorithm decoding the interpolated signal and runni...