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Data over GSM voice

We need a system which can interract with a GSM mobile/modem and via audio channel to be able to send data (it's like a modem on a carrier).

The problem is that the GSM voice channel isn' a simple carrier - the audio is entered in a codec.

We need to transfer data with a bandwidth of 300-400 bytes/sec - actually the audio is at codec's input with resolution of 8000 frames/sec - 16 bit width.

The system we need must be on this voice carrier because in many countries the CSD line service isn't available (this service has a bandwidth of 9600bits/sec) - we need fewer BUT on the voice channel.

The GPRS also isn't a good solution for us because requires session establishing, the service isn;t so cheap in many countries/providers and especially at prepaired sim cards.

The final solution must be provided like a PC software which can send/receive data connected to a GSM phone/modem - 2 PC's and 2 phones which are involved in a voice call.

The connection with PC can be made through the soundcard or better via Bluetooth - on a SCO connection - like used in HFP profile.

技能: 音频服务, 电子, 工程, 矩阵及数学软件, 无线

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About the Employer:
( 0 reviews ) Bucharest, Romania

项目ID: #444166

12名威客为此工作的平均竞标价是$521

bbk

Hello, I can make your project. Best Regards, Alexandr.

$550 USD 在60天内
(18条评论)
5.1
engmatlab

Dear Sir, i am very interested with your project, i can do it based on MATLAB-GUI. i am study with master degree of wireless communication and work more than five years on MATLAB. i can finish at time, sinc 更多

$450 USD 在10天内
(5条评论)
3.1
yamukha

I can provide hardware solution at $250. And software solution at $400. The actual problem - echo and GSM voice chanel itself. It was developed using specific human characteristics in voice recognition (not for recog 更多

$250 USD 在70天内
(1条评论)
2.3
yusuf1234

i will provide it on time.

$250USD 在1天里
(0条评论)
0.0
DigitalProdigy

The project is a logical communication systems problem. Please reply, i'll send a simple simulation model im Matlab and then can decide on the details of the project if the buyer is interested. Looking forward Thanks 更多

$600 USD 在10天内
(0条评论)
0.0
fwriter2

Sir, I can give you the working solution.. I have worked on the similar project and have made enough research including IEEE presentation on the topic. Besides, I can write another research project for you. For add 更多

$750USD 在1天里
(0条评论)
0.0
usamacpp2

Please check PMB

$400 USD 在10天内
(0条评论)
0.0
WirelessXp

I can give you better solution, include software and hardware. And I've engaged in 2G/3G development 6 years. Look forward to your reply.

$500 USD 在30天内
(0条评论)
0.0
ybellavance

I am an electronics engineer specialising in Digital Signal Processing. I could probably make the codec myself. Im presently working on an audio engineering project.

$750 USD 在7天内
(0条评论)
0.0
mohitesr

i need more details about the project. i have worked on similar things previously. if you are opting for me, Kindly let me know.

$350 USD 在15天内
(0条评论)
0.0
reaz03

Please check my PMB

$750 USD 在15天内
(0条评论)
0.0
shariqueqamar

Hi, We are a software devlopement company Parikshalabs Pvt. Ltd Gurgaon (INDIA) [url removed, login to view] Our Mission is to establish a world-class software R&D service provider that leverages our deep competence in tec 更多

$750 USD 在120天内
(0条评论)
0.0
alchemistt

Number of days for completion can be less than 45 but will not more than that...

$300 USD 在45天内
(0条评论)
0.0