telecommunication

How does trellis coded modulation (TCM) work?

I'm having a hard time understanding TCM. I've been trying to decipher this explanation, but I'm not having much luck. I'm not looking for lots of detail, just the basics of TCM encoding and decoding. A simple example of encoding and decoding a short string would great! Thanks! ...

Enterprise language, compiled or for JVM

We are currently developing carrier grade telecom applications in C++, Rational Rose and Java to run on an embedded platform based on Enea OSE which provides interfaces for the above three languages (actually C, Rose and java). I'm interested in increasing the productivity by choosing other more productive languages. I would like your...

Error Detection Effiency (CRC, Checksum, etc)

I have a hypothetical situation of sending data units, each of a thousand bytes. Failure rate is rare but when a error does occur it is less likely to be a single bit error and more likely to be an error in a few bits in a row. At first I thought of using a checksum, but apparently that can miss bit errors larger than a single bit. A pa...

Links reg communication basics

Hi all.. am working in communication system based embedded project.. i have no background knowledge in communication technologies.. can anyone provide links giving the basics of communication technologies like what is GSM, CDMA, Wireless technologies like wi-fi, WLAN, GPRS, etc.. i have searched the links which give technical aspects.. i...

mobile telecommunication thesis topic suggestion

Hello I will be writing my computer science graduation thesis this year and I plan to do my research towards the mobile telecommunication field. What are the hot topics regarding this field? What topics could be a good research material? Cheers. ...

C# for telecom applications ?

Hi, who is using .net technologies for telecom applications? Are there any resources for this? I am interested in topics as SS7 signaling, ASN.1, MML Commands etc. Thanks ...

How to disable PRL on CDMA?

Hi all, How could i disable PRL on CDMA radioblock through AT commands? thanks. ...

How to see the version of the TAP file

this is a telecom based query. we receive TAP files from the clearing house. i want see on unix which version of TAP does it belong. how can i do it.Isthere any tool to find the TAP file version? ...

Any certifications for Mainframe experience? Please suggest...

I'm having experience of 3years in Mainframe and working in India, for a reputed US Telecom MNC. I have expertise on COBOL, JCL, REXX and DB2. Can somebody suggest on doing some certifications. I know there are IBM standard DB2 certification, but do we have anything else? Your help is really appreciated. And also let me know if somebody ...

comparing modem.oqpsk probability error and ber

hi currently i have the following code in my matlab values = [0;1;0;0;1;0;1;0]; % can contain only 0s and 1s h = modem.oqpskmod; y = modulate(h, values); g = modem.oqpskdemod(h); z = demodulate(g,y); BER = sum(logical(values(:)-z(:)))/numel(values);% thanks to gnovice! now my question ...

simulation of oqpsk

hi for the simulation of oqpsk i have written the below values = [0;1;0;0;1;0;1;0]; h = modem.oqpskmod; y = modulate(h, values); g = modem.oqpskdemod(h); z = logical(demodulate(g,y)); BER = sum(values(:)-z(:))/numel(values); my questions are as follows: 1) how can i verify that it does what i expect it to d...

gChat Video API

I'm interested in making a 3rd party app for video conferencing through something like gChat, but their documentation is largely on the text-based portion of the technology. Where can I find some good resources to begin developing with gChat video? ...

Uses of Erlang in Telecom

I'm a web developer and a college student majoring in telecommunications. This means I'm decent at programming and I know a little about telecom networks (at a high, non-technical level). I keep reading that Erlang is used all over the telecom industry (supposedly for its performance). I'm wondering if there's anyway I can combine my p...

How can I call from my PC through my cisco ip phone?

Hi gurus, I am trying to call a telephone number fro my PC through my ip phone once my application completes its work. So I am searching for a way to access my ip phone from my PC. Please correct me if I am wrong or missing the obvious. On my PC in office selecting a phone in Microsoft office communicator and making calls from PC through...

Blogs to follow for programmers working on Telecom domain (Mobile/Smart Phones especially)

One per post will be great! ...

Serverless Internet Tools for Collaborative Development?

I'm wondering if there are any recommendations regarding tools for collaborative development over the Internet. Specifically, we're going to have a group of developers working on the same project in different geographical locations, without the benefit of a company-owned-and-run base. We need some of the obvious things, like Source Con...

What is a good book to use as a reference/learning resource for Specification and Description Language - Real Time?

What is a good book to use as a reference/learning resource for Specification and Description Language - Real Time? Also, is there any good UML software that supports SDL-RT? ...

Good beginners' level book about mobile telecommunication

I've recently joined a company who specialize in the mobile telecommunication domain. I'm encountering a lot of jargons, and I'm feeling a bit lost in most of the conversations. Although I'm quickly searching for the new terms on the web and learning stuff on the job, I would like to read an introductory book that will take me through th...

SDP media field format

Hey, I would like to create a SDP media field with its attributes, and there are a few things I don't understand. I've skimmed and read the relevant RFC and I understand most of what each field means, but what I don't understand is how do I derive from the Audio/Video Format of the JMF, which parameters of the format compose the rtpmap ...

What technology should i choose for this kind of an application?

One of my client has asked me an application Telephone answering machine which is exactly like customer care voice application (ie) he is maintaining a college, parents of students will call to a college phone no and they will be asked to enter student roll/reg no and they can hear that student attendence percentage,mark etc.... Is it ...