Adaptive Filter | ADPCM | ADSP | ADSP-2181 | Aliasing | AMR | Anti-Aliasing | ARMA | Autocorrelation | AutoCovariance | Beamforming | Bessel | Blackfin | Butterworth | C6713 | CCS | Chebyshev | CIC Filter | Circular Convolution | Code Composer Studio | Comb Filter | Compression | Convolution | Cross Correlation | DCT | Decimation | Deconvolution | Demodulation | DM642 | DSP Boards | DSP/BIOS | DTMF | Echo Cancellation | Equalization | Equalizer | ETSI | EZLITE (Ez-kit Lite) | FFT | FFTW | FIR Filter | Fixed Point | FSK | G.711 | G.723 | G.729 | Gaussian Noise | Goertzel | GPIO | Hilbert Transform | IFFT | IIR Filter | Interpolation | Invariance | JTAG | Kalman | Laplace Transform | Levinson | LPC | McBSP | MIPS | Modulation | MPEG | Multirate | Notch Filter | Nyquist | OFDM | Oversampling | Pink Noise | Pitch | PLL | Polyphase | QAM | QDMA | Quantization | Quantizer | Radar | Random Noise | Reed Solomon | Remez | Resampling | RTDX | Sampling | Sharc | TI C6711 | Undersampling | Viterbi | Wavelets | White Noise | Wiener Filter | Windowing | XDS510PP | Z Transform

Re: Channel Modelling

On Aug 22, 8:44=A0am, "cpshah99" wrote: > > Hi Julius > > Extremely sorry for not replying properly. > > As u had said to run with channel effect and 'no noise', and I did the > simulation, but still I am getting errors even at high SNRs. > > I think the adaptive equaliser is ...

Frequency /time domain equalization

Hello, I am doing simulation studies for frequency and time domain equalization. From the complexit point of view I completely agreed to the fact that frequency domain is better in the number of multiplications/additions. Regarding the performance (BER ) point of view I can see there...

adaptive precoding and pre-equalization

I was trying to search through literature in order to find advantages and disadvantages of adaptive pre-coding and pre-equalization over adaptive post-equalization. I failed. Can anyone point to a good reference. 2ndly on adaptive pre-equalization there are only three papers when we search ieee...

Why not fractional space spampling when frequency domain equalization?

as we all konw, fractional space(FS) spampling is robust to nonideal timing synchronization when we do time domain decision-feedback equalization. My question is: why no paper mentioned using FS frequency domain DFE equalization? at least till now I havenot read a paper confirm it. Any comment or re...

Ungerboeck metric for MLSE Equalizer

Hello. Who can give me some description about Ungerboeck MLSE equalizer? I use it for GSM burst equalization and get strange result - it works bad. BER is increased as comparision with no equalization. I estimate Channel Impulse Response and use it for signal reconstruction in eaualizer but it ...

Equalization in satelleite channel

Does signal from geostationaric satellite need to be equalized? I'm talking about static receivers, not mobile. Because as far as I understand this channel, except for non-linear distorion due to high-power amplifiers, which does not affect M-PSK modulations, there are no other distortions that re...

Q) MIMO-OFDM and freq-domain equalization

Hello, everyone. In SISO-OFDM, we usually employ a frequency domain equalization after the receiver FFT module, as a way to compensate for the channel distortion along frequency bins. We depend on OFDM channel estimation and simple inversion for this purpose. In MIMO-OFDM, either multiplexed s...

Turbo Equalization

Hi, I am working on Turbo Equalization based on MMSE-SC based techniques. I have a question on choosing the chnanel code. All papers which people refer uses convolutional codes decoded by using SOVA. Is there any reason why we use convolutional codes rather Turbo codes ? Any sugge...

Equalization in OFDM

Hi guys, I was doing the simulations for the multitap frequency domain equalization for multicarrier system (DMT based). It seems though the at the band edges (First few tones and last few tones) higher performance can be achieved if we use higher number of equalizer taps. Can you people pl...

[Enquiry] how to add OFDM subcarriers in simulink

I am doing a project on OFDM equalization. So far, i have been doing equalization for one ofdm symbol. I wish to ask how could i add more subcarriers in by using Simulink? Is there any example that i can refer to? Thanks alot. ...

adaptive equalization benefit

How much benefit can adaptive equalization really get you in a packet transmission system over multipath channel? Since one will need to do synchronization before training the equalizer, it seems to me that synch will be the first one to fail most of the time if ISI is really serious. So that me...

Re: Software for isolation of specific frequencies

It sure seems to do what you want, but maybe you aren't looking for the right thing? The terms you want to look for are equalization and filtering. In Audacity, select your waveform, then go to Effects-> Equalization or Effects-> FFT Filter. -- Jon Harris SPAM blocker in place: Remove...

Wiener solution for equalization

In order to find the Wiener solution for equalization purpose, do I need to provide delay to the desired signal as in the case of LMS algorithm? Will the result of the Wiener solution become better if I provide some delay to the desired signal? Thanks. ...

DPSK's relation with OFDM and Demodulation

Hi, I understand that simplified equalization is one of the good reasons for going with OFDM. But, how do they manage it ? That is, The OFDM may be viewed as using many slowly-modulated narrowband signals rather than one rapidly-modulated wideband signal. So, The Differential modulation such a...

Re: psychoacoustics of audio effects (dsp), equalization and filtering

On 31 Gen, 14:00, "Setanta" wrote: > "different" wrote in message > > news:1170239891.106561.239840@j27g2000cwj.googlegroups.com... > > > I need to know what are the effects of sound alteration via dsp > > (reverb, echo, chorus, flanger...), filtering and equalization on > > p...

Re: Paper on LMS adaptive equalization

"Alberto" wrote in message news:wyQbf.28038$65.864605@twister1.libero.it... > I am in search of the PDF of this paper : > > "Efficient realization of asynchronous LMS adaptive equalization" > by Jan W.M. Bergmans > > I have been unable to find it with Google, nor to find an email ...

OFDM cyclic prefix/Equalization question

Hi, I am working on a uncode 16-QAM OFDM simulation. The simulation works fine when used in AWGN channel. I have a couple of questions now when i am simulating performance in multipath channels. 1) What I want to understand through simulation is the effect of cyclic prefix length on perform...

Re: Echo Cancellation - non acoustic application

> all: > > I dont know if this will work or not, but from what I read it sounds like > acoustic echo cancellation is fundamentally the same problem I have. > > I am recording pitch measurments with a single sensor located at the > center of gravity of a vehicle. I would like to extract the ...

classification under optimal and sub-optimal

well all dsp members, i want to clarify under what circumstances does the optimal and sub-optimal classifcations of a particular algorithm is done. we say EQUALIZATION with error control coding can be done in two ways 1. optimal receiver has to tackle out both I...

Re: Sliding window Viterbi

john wrote: ... > See if you can dig up a copy of "How I Learned to Love the Trellis" by > Bernard Sklar. It appeared in IEEE Signal Processing Magazine a couple > of years ago. If you can't find a copy, I'll send you one. The world fills me with awe. At 73, I am still amazed and th...

Re: Adaptive filtering

thom wrote: (top posting fixed) > > > Don't you think "I don't have information about the original signal" is > > rather incompatible with "it's a large band signal, ofdm modulation"? > > > > Steve > > > > > > Maybe I'm not clear... Yes I know for example the signal bandwidth...

Re: Channel tracking in an OFDM system

On Jul 28, 11:20 am, "ananth.rs" wrote: > Hello, > > I am trying to design an adaptive equalizer for an OFDM system which has > an extremely low symbol rate. I have a question regarding this. > > The transmitter and the receiver are moving wrt each other. For what > amount of relati...

Re: Question about aliasing spectrum in RC filter

Sorry, I had to add some information. The topic is about frequency domain equalization in broadband communication. It is an alternative to OFDM to deal with frequency selective fading channel. ...

Re: How to tell which channel the signal is transmitting

Helen, You might have to consider more then two channels (4 actually i think) since there might be some coupling between H0 and H1. The signals are going to go thru all the channels. The best way you can do is to recover the signal at the receiver (equalization) or find out what the channe...

Re: Timing recovery in Digital Synchronous recievers

On 30 May 2007 08:11:51 -0700, BERT wrote: > On May 29, 3:55 pm, "parth_va...@yahoo.com" wrote: > > Hello, > > > > Has anyone worked on a term paper about this classic paper published > > by Mueller and Muller in IEEE transactions on Communications, Vol > > COM-24 No.5 May 1976? ...

Re: LMS also simulink

On Tue, 15 Jan 2008 06:54:58 -0600, "me_chilled" wrote: > Hi All, > > I am wanting to implement LMS algo in simulink without using the LMS block > given in simulink library. > > My problem is that ,I want to apply the calculated filter coefficients to > the ''input'' of the LMS bloc...

HIPERLAN/2 PHY layer simulator on Matlab

Hi all; I have this small problem with a HIPERLAN/2 simulator, I have three curves, 1= the BER-SNR normal curve for QPSK. (which we can find in all DSP books) 2= the BER-SNR curve from the HIPERLAN/2 simulator without multi-path channel effect, only: QPSK mapper-> inserting pilots -> ...

Single carrier with frequency domain equalization (SCFDE)

I have seen some paper demonstrating the benefit of SCFDE over OFDM, basically low PAPR performance, comparable complexity, improved performance especially when convolutional code rate is high. But why we see many standards still using OFDM, but not SCFDE? ...

Equalization for FH-4FSK system

Hi, I would like to design use an equalizer for improving the performance of 4fsk-frequency hopping system in rayleigh fading, I ve seen matlab functions but they all are for linear modulations or is there any function for non linear modulations??. Can any one please guide me on this issue? Is there...

Equalization: FDE or TDE? SC-FDE/OFDM?

I have some questions.... Given the elegance of FDE, why has FDE lagged behind in use compared to TDE? Also, why is OFDM so popular when SC-FDE is so much better? (No ICI, no peak to average issues) ...

Re: IIR with fixed-point numbers?

robert bristow-johnson wrote: .. > Andor, with one caveat, i think that Al's fixed-point implementation (with > 32-bit fixed-point signals and 80-bit accumulator) I purposedly suggested 24-bit fixed-point input signals. If you take 32-bit fixed-point input signals, the simple format convers...

Blind System Identification

Okay, so I'm trying to work my way through "Blind System Identification and Channel Equalization of IIR Systems without Statistical Information", by Bai and Fu; specifically "Algorithm 4.1". Though the nomenclature seems to be standard for multirate systems, it is cumbersome. But I think I've ...

Re: How to conver MSK to BPSK

> Fan.Zhang wrote: > > Hi all, > > > > I found these words in an Article. How to understand it? > > "To demodulate MSK signal, if receiver makes a continuous phase derotation > > of pi/2, the received signal can be interpreted as BPSK" > > > > How to prove that in math? > > > >...

VSB as QAM

Hi, I'm currently try to develop an 8-VSB demodulator (for ATSC terestrial digital TV). I saw that there is a simple way to covert to 8-VSB signal to 64-QAM (offset QAM, to be more precise). My question is: is demodulating QAM is more cost-efficient than woking directly on VSB signal? (by means o...

Help on MMSE and Least Squares

Hi, I'm a rookie in Adaptive DSP and equalization and I have questions bugging me and I need some help from you all.Now wherever I have read,they talk of MMSE criterion and a LS(Least Square)Solution/Fit.From how I see, MMSE is point on error surface in terms of expectation of error and a LS is bes...

MAP vs MLSE

Hi guys, I'm currently doing my literature review on both types of equalization. Based on what I understand, both have comparable performance but use different approach; MLSE: sequence detection while MAP symbol by symbol detection. Since both relatively similar, how can we choose which type of e...

TI DSP uP vs FPGA

I am trying to determine the best solution for real time image/video processing in hardware... Does anyone have any thoughts as to which solution (FPGA or DSP uP) is better. I would like to run several (roughly 10) convolution filters as well as perform image histogram equalization operation...

Re: interaction between bandpass equalizer and pll

Vladimir Vassilevsky writes: > tmoshe wrote: > > > Hi, > > When using the SG algorithm for equalizing, the error signal is computed > > at the end of the pll. My problem is that the pll cannot be locked before > > the channel is reasonably equalized. Thus, I have a "bootstrap" where...

Re: OFDM Transmit diversity

On May 2, 5:35 pm, Shahin wrote: > Hello, > > Assume you have 2 OFDM transmitters that are simultanously > transmitting different data and the data is somehow coded (ie CDMA). > After IFFT the ofdm symbol of each transmitter , X1 and X2, passes a > freq. selective fading channel...

Re: Does noise enhancement affect Bipolar/QPSK data (since only the sign counts)

porterboy76@yahoo.com writes: > [...] > If the signal and noise are both scaled equally, then > how would this affect the BER? How would that be equalization? Sounds like gain to me. -- % Randy Yates % "She tells me that she likes me very much, %% Fuquay-Varina, NC ...