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Oversampling in communication systems

Hi all, I would like to know about the oversampling used in communication system. There are 2 technique which commonly used. 1. Using (N-1) zero padding, to get N factor oversampling and finally use a digital filter to filled up the zeros. 2. Repeat the sample (N-1) times to get N facto...

Oversampling

What is the highest oversampling rate in commercial use on high fidelity (15 kHz) audio nowadays? I'm not looking for anything leading-edge or very pricey. Just commercially available ADCs that are premium priced but aren't extremely expensive. A few years ago I recall 8X oversampling wa...

Re: Maximum useable oversampling rate10x analog signal bandwidth?

"I don't see where it says that higher sample rates reduce the bandwidth." Well the title for one, "Option: Reduce noise by oversampling (at expense of bandwidth)" And the first sentence too, also just type in a oversample rate and you will see it recompute the lower bandwidth and displ...

Does oversampling bring diversity gain?

As oversampling produces several baud rate signal sequences (for example, oversampling by a factor of 2 produces two baud rate sequences with an offset of half baud duration), could these sequences be viewed as a kind of diversity? and what's its gain? _____________________________________ ...

Oversampling & moving-average-filter

Hi, I've spent some time reading about oversampling and I think I understand the fundamentals. Oversample by some factor > desired bandwidth, decimate and increase ENOB (with certain assumptions about dithering, etc). My signal of interest is slowly varying (1-2 Hz), and I'm using a 10...

Re: Oversampling in WCDMA receiver

> In article , > "HSDPA-boy" wrote: > > | I see. Since you mention increased accuracy, are you assuming RRC > | filtering in the digital domain? > > Yes. > > > | Could you point me to some literature that discusses these matters? It > | would be interesting to see how the o...

Using oversampling to enhance SAR ADC performance

I'm working with the new 56F630x series of Motorola DSP's (with an onboard 12-bit ADC). My application could make good use of 14-bit data, so I planned on oversampling by a factor of 16 and filtering with decimation to get an extra 2 bits out of the ADC. I recently spoke with someone from Mot...

only I mixer instead of IQ mixer?

I have tested use only cos(2*pi*fmix*n/fs) to demodulate a BFSK input signal. And it worked. Question is how much worse will it be? Will it be 3dB worser? Can I compensate this by oversampling instead? For example will a double oversampling give 3dB more SNR. Any answer is welcome! /Mary ...

Oversampling for noise reduction

Hi, I've been reading quite a bit about oversampling and it's apparent use in noise reduction, but haven't been able to tie everything together. As I probably can't explain my exact question clearly, I'll give an example, I have a Analog Devices evaluation board with a 1MSPS A/D with CPU hooked...

Effect of OverSampling

I'm new to DSP and also this group. My question is "what can be the negative effect of Oversamling in terms of Destortion in original signal?". As in undersampling two spectrum are overlapped and we may not be able to get original signal.. is that any kind of effect in oversampling? ...

Re: Is 44.1 KHz sample-rate enough to cover the entire human hearing range?

Eric Jacobsen wrote: ... > You can always trade off sample rate for sample width, i.e., if you > want 12-bits of dynamic range, but your storage medium is eight bits, > crank up the sample rate. When you decimate (or reconstruct) for > playback you'll get your equivalent twelve bit...

Re: Over-sampling with TMS320LF2407A

The proper way to perform such oversampling is to put a decimating lowpass filter just after your ADC. Because of the oversampling, noise will spread over _wider_ spectrum area and hence when you apply a lowpass filter you will get higher signal/noise ratio cutting out this (_wider_) noise. N...

Zeropadding vs. Oversampling

Hi, I've got a fundamental question. I have a signal (impulse response of a room, computed from the original signal and the recorded signal) and now I want to find out the maximum of that impulse response. This IR has to be interpolated somehow, right now it is done by oversampling, but I was ...

OFDM transmitter oversampling

Hello, I have a question regarding the OFDM transmitter. In order to reduce the burden on the reconstruction filters, oversampling is used before feeding the data to the DAC. Oversampling, however, creates images of the baseband signal. To remove these images, low pass filters are placed after...

Oversampling for discrete time input

Hi, May I know how to perform oversampling for discrete time input in MATLAB? Thanks ...

Oversampling algorithm for root raised cosine pulse shaping filter

hello ! I am working on a design of a Root Raised Cosine Pulse Shaping Filter and my design of filter taps are on the basis of sampling frequency which is of 4 times the BB frequency. Now to use this filter in the Tx section, I need to oversample my input data by 4 times. I would like to have a s...

FFT Size calculation.

Hi, I have the following problem that I am trying to address. Lets say we take 64 numbers and apply FFT of size 64. Then we concatenate 100 of these 64 numbers, and perform D/A conversion. This signal is digitized at a rate other than the original sampling rate, say we have oversampling of 3/...

Re: FM demodulation help needed

Prasanna Kumar Ganta wrote: > How about... > > (1) Amplitude limiting the digitized FM signal. > (2) Passing them through a frequency discriminator ( a filter whose > transition band is linear and wide enough to span the delta F of the FM > signal) > > Now you have an AM signal....

Re: Bit gain when filtering and then downsampling?

SL wrote: > Hello all > > > > I'm wondering about how many bits I can gain if I first sample a signal with > a sampling rate of fs and have N bits. And then I filter the signal to a > bandwidth of fc Hz. And then at last I down sample the signal with D. > > > > ex.) > ...

Re: OFDM and oversampling

When the samples go through the digital to analog converter (DAC), the spectrum is replicated periodically, as you should now. In order to remove (suppress) the spectral replicas, a reconstruction filter is required following the DAC. If there are no high frequency bins left empty to create a...

Re: Delta-sigma ADC question

Ville Voipio wrote: > > Actually, it would be more precise to talk about "oversampling" > converters, because that's what makes the difference. Not the > actual converter topology or modulator order. > > - Ville > Not exactly. The pole in the feedback loop of a delta-sigma conve...

Re: FM Demod question

"Tim Wescott" wrote in message news:11f1okk9m8sna1@corp.supernews.com... > > Clay > > I saw that after I posted the comment - the next observation is that it is > exact when you're taking the differential, but how exact is it when you're > approximating the differential with a dif...

Re: Sample Rate conversion

Hi Fred, My application is an OFDM transmitter. The output of the IFFT needs to be oversampled by a factor of 4 (after adding the CP). I thought of doing the oversampling by interpolating (inserting "zeroes") and low pass filtering the output of the interpolator to remove the unwanted images. I d...

Re: how to use 6 bit ADC/DAC to gain 8 bit ADC/DAC performance?

"kiki" writes: > Hi all, > > Can anybody suggest some methods of gaining 8-bit ADC/DAC performance with 6 > bit only ADC/DAC? One can use oversampling, or oversampling along with noise-shaping. The latter technique is commonly called a delta-sigma (some say sigma-delta, but they'r...

Oversampling vs. nr. Bits

Hi, I'm sampling a signal with a 35 MHz BW at a rate of 100Msa/s and 12 bit. The nature of the signal is something like 100ns Peaks at about 2/3 of peak value. I need the integration over each signal(100ns) but due to the sampling rate I only get at about 4-10 samples of every signal, a number w...

Question related to Sigma-Delta Datasheets

Hi All, I am going to be selecting a specific sigma-delta converter for an application and am getting a bit confused on the terminology. I have read up on the theory and understand it. Looking at this datasheet: http://focus.ti.com/lit/ds/symlink/ads1251.pdf On the first page, it says 20...

Re: Negative Group Delay ... again!

> On 10 Mrz., 11:05, Rune Allnor wrote: > > On Mar 10, 9:40=A0am, Andor wrote: > > > > > Rune Allnor wrote: > > > > A far more intersting question is whether a negative group > > > > delay is non-causal. > > > > > You seem to have comletely missed the whole point of the exe...

Re: reconstruction filter

"maxascent" wrote in message news:ZpSdnSyNJfpa11jeRVn-pg@giganews.com... > I am not using a Bessel filter, but an elliptic filter. I dont want to use > an dds ic as I am going to use an FPGA to do the DDS so I can generate > other waveforms and arbitrary waveforms. I will have to use a B...

Re: Tone Indentification

Ron N. wrote: > Jerry Avins wrote: > > > vbbrett wrote: > > > > > Why does the 8 samples per cycle make the algoritm easier to implement? > > > How does the number of samples affect the output? Why can't I just > > > check 88 samples for a particular frequency? I'm afraid I don't > > ...

Re: Walsh-Hadamard instead of FFT

One bit audio is manageable, if I use insane oversampling (through a sigma-delta modulator, for example). -mn ...

Oversampling

Hi All, Can anyone provide matlab code fragments to explain to me how to use the kronecker delta to oversample a signal, s, by a factor of k ? I'd really appreciate any help anyone can give on this, Many thanks, R. ...

Re: oversampling from 8khz to 44.1khz using multistage filter

> 1. Go to the library > 2. Get a classic book on multirate processing by Rabiner > 3. Don't ask any more stupid questions 4. Close all newsgroups. ...

Re: Frequency domain filtering (rectangular window question)

tjuii wrote: > > Why did you ask your original question? > > > > Jerry > > -- > > Engineering is the art of making what you want from things you can get. > > ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯ > > > > > Because I want to know more than I do righ...

Re: Compensating DAC for low bit-resolution with high sample rate

bmearns wrote: > I have a DAC with 12 bit resolution that I want to use to playback an > audio clip with 16 bits/sample. Obviously, I'm going to loose some > quality, but I was wondering if it's possible to improve the quality a > little by increasing the playback rate. For instance, my audi...

Re: limits of bitstream coding

Oliver Glassl writes: > > If so, then you're comparing apples to oranges. A linear PCM signal at > > Fs samples per second always has a bandwidth of Fs/2 Hz; a 1-bit delta > > sigma signal at Fs bits per second always has a bandwidth < < Fs/2 Hz. > > > So can you tell me the bandwi...

Re: Kalman filter with accelerometer

Don't know anything about Kalman filters, but I have used oversampling + averaging to decrease the noise of accelerometers while maintaining the required bandwidth. You have to have a fast A/D and CPU though, I use 64 samples. ...

Re: Query on AIC-23 Codec

Prasad > i am going through the datasheet of AIC-23 Codec on TI board, in the > datasheet i have come acrros this statement > BOSR Base oversampling rate > USB mode: 0 = 250 fs 1 = 272 fs > Normal mode: 0 = 256 fs 1 = 3...

Re: Sigma-Delta ADCs

"Symon" : > Sanjay, > Stick this into Google. > sigma delta design maxim Everybody is getting into that business it seems. A decade ago it was unclear what new could be said by tutorials on the subject. (New arrivals haven't always answered that point, and occasionally even added...

Re: one pixel shift in 2D sinc interpolated image

... > > I guess that if my image shifts, that means I am effectively convolving > it with a shifted sinc function, which means I'm multiplying the 2D FFT > data with a phase-modulated rect function (i.e. somehow disturbing the > phase of the original data). I don't see how just zero-pa...

Sigma Delta Modulator A/D

I have read a bit about oversampling. Understand most of the theory but get stuck at the easy bit. If we sample with one a one bit ADC - how do we get 16 bits back from this single bit to do the processing? Naebad ...