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Channel models for HIPERLAN/2 ETSI/BRAN Doc.

Dear All, Can somebody help me in finding the following documents? 1. J. Medbo and P. Schramm, "Channel models for HIPERLAN/2," ETSI/BRAN document no. 3ERI085B. 2. J. Medbo and J-E. Berg, "Measured radiowave propagation characteristics at 5 GHz for typical HIPERLAN/2 scenarios," ETSI/BR...

Re: Need info on GSM AMR frame size ....

Have a look at the ETSI website www.etsi.org They have all the standards concerning GSM Wim ...

Channel Model Document For HIPERLAN/2

Hi, Can somebody help me in finding the following documents? 1. J. Medbo and P. Schramm, “Channel models for HIPERLAN/2,” ETSI/BRAN document no. 3ERI085B. 2. J. Medbo and J-E. Berg, “Measured radiowave propagation characteristics at 5 GHz for typical HIPERLAN/2 scenarios,” ETSI/BRAN docum...

How to get the standard of Hiperlan/2 for channel model

Hi, I want to find the channel model of Hiperlan2. Every source I get points to ESTI's website:www.etsi.org. Although I have tried several times in that website, no such file can be got. Can you help me? Difference sources say the same thing: Medbo, P.Schramm "Channel Models for HIPERLAN/2"...

Re: About spectrum of speech and fax transmission

Hi, T.30 is very old protocol and, you are right, I was not able to google one, too. The only way to get the text happened with me when I used to work as a modem developer at Cirrus Logic. To get voice protocols is easy job. Look on ETSI site. They have everything, including homologation, at le...

Re: Data rate of 8psk

There's already an ETSI wireless standard for 8psk constellations called 'EDGE'. The symbol rate is around 270kHz, and the ETSI standards body specifies EDGE receivers to handle around 5 symbols of ISI from multipath/fading. If your receiver faced a similar air channel, it would need to handle...

Mistakes in the DVB-T standard?

Hi, Are there any DVB-T experts around? I found something weired in ETSI EN 300744 v.1.5.1 (2004-11) and want to have verifications for my suspect. I implemented a DVB-T receiver according to the DVB-T physical layer standard ETSI EN 300744 v.1.5.1 (2004-11) but it does not work with real sign...

ETSI basic operation: meaning of L_sub_c

I'm looking for an authoritative definition of the ETSI basic operation L_sub_c, specifically the sense of the Carry flag on input and output. I have the AMR codec reference C code, but L_sub_c is commented as subtracting input carry and then does the opposite (i.e. subtracts invertse of inpu...

Channel model

Hi, I'm currently develop a DVB-S2 demodulator, and I want to know how to get the channel model (written in matlab or c etc.). I've been told that the standart organization (i.e., ETSI on my case) may supply something like that, but unfortunatley I've could not find it. Please help me! :) M...

AMRWB+ Source Code

Could someone tell me where on the 3GPP site is the "AMRWB+ reference code" . . . we're evaluating it. I've downloaded the only C sources I could find (ts_126073v070000p0.zip) from the ETSI site. Thanks in advance and regards, J ...

DSP fixed-point math library

Is there fixed-point math library (preferably as inline functions or macros) such as the one defined by European Telecommunications Standards Institute (ETSI) and used in in GSM 06.06 and other standard vocoders - available for: 1. ADI's BlackFin? 2. IBM PowerPC? 3. Intel Pentium? 4. TI DSP?...

Problems about continual pilots in DVB!

Hi,everybody! In ETSI EN 300 744,it is abviously that the freqency domain continual pilot carriers are NOT equidistant,in 2k mode,they are [0,48,54,87, 141,156,192,...],and I can not see any rule! why so? I think: The pilots are "boosted",so, with frequency domain correlation on the OFDM sy...

Re: Simulation GSM

wrote in message news:1114744944.117177.60600@o13g2000cwo.googlegroups.com... > Hi, > I am doing a simulation on GSM physical layer using MATLAB or > Simulink, I am relatively new to it. Can anyone please help on this any > ideas, I have seen both these packages but can't find help...

AMR-Codec / Patent?

Hello! Does anyone know about a patent on the AMR codec? And if a patent exists - who is contact for licensing? On the ETSI IPR search there's only mentioned that "Ericsson claims to have some patents (pending) around AMR". The ANSI C code example from 3GPP (26.073) is completely without...

HiperMAN Standard/OFDM

I recently started simulating a HiperMAN/WiMAX PHY on MATLAB. However, in the standard available in the ETSI website, there is mention of a "sampling frequency" and a term "bandwidth over sampling frequency". I haven't a clue as to what these terms mean and where they're used in the OFDM process....

Channel model for DVB-T

hi: everybody!i have doing DVB-T demodulator, i just want to get program of DVB-T channel model ,which written by matlab or c etc, who can help me ? And a question bother me : in ETSI EN 300 744-DVB-T Standard, it include channel model parameter ,but when i translate path delay(us) into sam...

Should AWGN be part of a simulation setup that tests Adjacent Channel Interference performance?

Hi there, I'm trying to simulate the adjacent channel(ACI) performance of a continuous phase modulation(CPM) scheme so that I can determine if my modulator/demodulator meets a particular ETSI performance specification. I'm not sure if my simulation should include AWGN as well as the ACI? Ultima...

DVB-H OFDM matlab Question

Hello I am working on simulating DVB-H 4k mode according to ETSI standard. According to the standard i am populating 3024 data carriers with QPSK. I am trying to validate the simulation by measuring the BER before Vit&RS decoding and comparing to standard Eb/No qpsk curves. The problem is that I am...

AMR codec implementations

Hi, I am looking at running the AMR 3GPP codec on an ARM9TDMI platform. This not strictly a DSP, but I've looked around and I haven't seen much about AMR except the ETSI reference codec so I thought I could ask here. My question is - has anybody seen a fixed-point 32-bit implementation of the...

Re: the difference between mobile signal and telephone signal

HyeeWang wrote: > 1. What is the difference between speech signal attained from mobile > and that of telephone? 64kbit/s versus ~10kbit/s > 2. How to eliminate such terrible distinct difference? Is it possible? Yes. Just reduce the cellphone subscriber base to ~1/4 and increase t...

Re: project

In comp.compression pachu wrote: > Hi all, > I had posted a question a few days back, expressing that i was > intended to do a mpeg coder decoder. From the replies that i got i > have understood that it would a huge project. > > I shall express my wish. We are 3 guys here, we a...

IFFT in dvb-t

Hi all, I'm working on the Matlab Simulink DVB-T demos (2k). I'd like to understand: After the IFFT block, the frames composed by 2048 data samples ( or elementary symbols of 7/64us duration) are sent to the AWGN channel. But, according the standard ETSI EN 300 744 v.1.12 (1997-08) on which the...

urgent: modulation normalisation factor

Hi friends, I have a big question in my head. The solution of this problem is very important for me as my supervisor waiting for my response. Please help me!!! Here is my question. I read in HIPERLAN/2 physical layer ETSI/BRAN in part: signal constellation and mapping. They mention about t...

What to make out of the fixed point C code ?

I am new to this group and am looking for an answer for the following, hope somebody can help. How should the fixed point C code available from standard bodies like ITU, ETSI be used. Is the reason one of the following or anything more to it ? (a) Use the fixed point C code only as a refere...

Recovery of IQ modulation frequency (DVB-T)

Hello, I am a bit unsure how the demodulator recovers the original IQ modulation frequency of a DVB-T baseband signal. In the standard the frequency "fc" is (IMHO) not specified, however there could be read (ETSI EN 300 744 V1.5.1 (2004-06), Page 45) "A subsequent up-conversion process then gi...

Question on indepth Interleaving in DVB-H

accoding to the ETSI EN 300 744 "In the 2K mode, interleaved vectors shall be mapped onto four consecutive OFDM symbols. For even interleaved vectors these shall start with symbols 0,8,16,24, etc. and for odd interleaved vectors these shall start with symbols 4,12,20,28, etc. in every super-frame...

Re: Single Channel Noise Reduction algorithms/code for Digital Hearing Aid

On Mar 27, 5:47 am, "waheed2nice" wrote: > Hi Everybody, > I am working on designing a digital hearing aid as my MSc project but I am > facing severe difficulties in removing noise. Is there anybody to tell me > how to solve this problem or an implementable robust VAD (Voice Activity > ...

Re: IFFT feeding order in DVB-T

dirkpitt wrote on Monday 12 Mar 2007 07:33: > Hi everyone! It's my first post here, so please be patient if I'm too > newbie ;) > I've tried a search in the newsgroup but no valid results. > > I'm trying to make a DVB-T transmitter in VHDL, but I find some problems > when feeding the ...

Re: Free Standards or Not?

Jerry Avins wrote: > John E. Hadstate wrote: > > > > "Fred Marshall" wrote in message > > news:w9udnTDQzZ53t6ranZ2dnUVZ_tajnZ2d@centurytel.net... > > > > > > It seems silly to not have standards freely and quickly available on > > > the web - once and for all. > > > > > > > ...

Re: What's "allow Quasi-Error-Free operation"?

In the DVB context "quasi error free" (QEF) means a level of errors that is defined as the "threshold" of where the system is working and where it is not. The "threshold of visibility" is another term sometimes used referring to a rate of errors that just becomes noticeable to a TV viewer. ...

Re: PLL Basics

Bonsoir, Perhaps we can take profit from ITU-T and ETSI specifications for clocks that are build with PLL. I just read that this evening, and I forgot it was writen like this. For example, in G.813 about SEC (SDH equipment clock). Today, this type of clock is also used in synchronous Ethe...

Re: GSM Training sequence

vimal_bhatia2@yahoo.com (Vimal) wrote in message news: ... > Hello all, > > I have a small query regarding the GSM training sequence. The > recommendation GSM 05.02 suggests that bits "61 to 86" which makes > "26=5+16+5" bits are for training, whereas in many online tutorials I > see o...

Question regarding pilot based channel estimation/frequency synchronization in DVB-T

Hello I am working on the implementation of a demodulator for the European DVB-T standard. I had a query that I hope will be answered by this group. During the initial acquisition, how does the DVB-T receiver lock on to the starting phase for the continual/scattered pilot carrier symbols. ...

Re: Symbol Recovery algorithm for 16QAM

"Rajenish_jain" wrote in message news:aeCdnZ2dnZ0-C9SlnZ2dnTR0ZN-dnZ2dRVn-z52dnZ0@giganews.com... > I need to simulate symbol recovery of a 16QAM or a higher constellation > QAM. I am looking for an algorithm which I can simulate using c code. I am > using the baseband signal modulated u...

Re: Searching for fixed point g.728 sources

Steve Underwood wrote: > That much is easy to find, but really doesn't say a lot. Those vague IPR > statements are everywhere, with nothing to back them up in most cases. > The ITU patent database is a mess. People put claims of IPR in their > database, but trying to find out which pate...

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

"santosh nath" wrote in message news:6afd943a.0310010236.6dde9080@posting.google.com... > So OFDM is more robust against frequency selective fading. Santosh, Thank you for your easy and kind explanation. I add more reason in optimality point of view. OFDM is more optimal appro...

Power Delay Profile

hi everybody, i'm trying to generate an etsi filter in order to simulate a channel. I did it but there is still one problem, i don't manage to take in account taps delays.. I read on the net we have to use the power delay profile of the filter but i'm not able to manage to coding of this method. ...

Re: Where can I find the ISDN standard T12.601?

On 7 Apr 2006 06:49:18 -0700, "fl" wrote: > > Allan Herriman wrote: > > On 6 Apr 2006 09:31:19 -0700, "fl" wrote: > > > > > Hi, > > > I want to find the ISDN standard after I read a paper. In the reference > > > of the paper, it refers to: > > > > > > Amer. Nat. Std. Teleco...

Re: time varying noise

porterboy76@yahoo.com wrote in message news: ... > Hi folks, > ello > I am modelling OFDM over a time varying channel using MATLAB. I want to > examine system performance as a function of receiver SNR. What I want > to know is how to specify the receiver noise power, given that the ...

Convolution and cepstral mean subtraction

It seems to me that cepstral mean subtraction (CMS), which is commonly performed in computer speech recognition system, corresponds to a circular convolution. I am curious what people think about how I'm viewing this and about the possible effects of changing CMS to use a linear convolution. ...