This project targets a situation where two persons are onboard an aircraft. Both persons have android smart phones and want to transfer a file from the SDCARD on one phone to the other, as illustrated in Figure 1 below. Use of radio transmitters and receivers is forbidden so the remaining choice is file transfer by sound. In this project you will do just this. The main challenge in this task is to design and implement a modem that modulates your digital data (the file on the SD-CARD) over the acoustic channel, transmits it through the loudspeakers of one of the smartphones and receives it via the microphone of the other one. Then, the received signal should be demodulated back to raw digital data. Therefore, the required skills for a good implementation includes knowledge of modulation and coding schemes, pulse-shaping and synchronization techniques. The references at the bottom of the page can provide you with some initial information for your task.
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Implement a system which is capable of transfering a file at 100bits/sec using some simple technique e.g. FSK at a distance of at least 1 meter.
Push the data-rate incrementally to at least 10kbit/sec. Describe and motivate the techniques needed to achieve the data-rate.
The android assignment completed (given during the android lecture). An implementation according to the basic requirements where signals are sent over the acoustic channel but the processing is done in matlab.