BackGround
A CDMA (Code Division Multiple Access) based communication system allows the users to share an available frequency spectrum. The users are allocated different codes that are recognizable for the preferred receivers. This solution has several advantages, among other it gives increased robustness to interference. The CDMA project will investigate the benefits and losses of using CDMA communication system on an acoustic channel between two computers. The focus of the project will be to study how a higher data rate will affect the robustness to interference. During the project course 1999 a project named Interference Rejection in an Acoustic Communication System, developed a communication system on an acoustic channel. Year 2000 a project named Acoustic Communication system with two-branch diversity took place. These two projects have influenced the objectives of the CDMA project and they are the most important frames of reference.

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Presented By:
Björn Beckius
Jonas Granlund
Krister Estmer
Sofia Ladjemi
Stefan Einerman
Ulf Bragnell

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Objective
The goal of this project is to implement a real-time digital acoustic communication system using CDMA. The system should work reliably in a multi-path environment. The system should allow different coding gain to illustrate the trade-off between data rate and robustness to narrow band signal interference. The transmitted data will be pictures and text. The results from the two earlier projects are described further under System Overview (5.3). The result that the CDMA project should achieve is lower error probability with the same bit data rate as The project will be finished 2000-05-31 with demonstration and oral presentation. In addition, the final report and documentation will be available at this time. The group is determined to follow the time plan of the project.

read full report
http://s3.kth.se/kurser/2E1366/students/...ctplan.pdf