Performance
Bitrate: 2000 bits/s
Carrier frequency: 3.5 kHz
BER at 3m: <1 % Group members
Stefan Allevad
Tomas Andersén
Henrik Back
Jonas Gustafsson
Mattias Nyström
Adam Wiå
Assisted by
George Jöngren
Equalizer-coefficients during
receiving 10000 bits BPSK Symbol-constellation
for a 3 meter transmission Graphs over data in the receiver Group ORANGE Year 2000 http://www.s3.kth.se/signal/local/www/edu/projekt/students/00/orange
Performance
Bitrate: 2000 bits/s
Carrier frequency: 3.5 kHz
BER at 3m: <1 % Group members
Stefan Allevad
Tomas Andersén
Henrik Back
Jonas Gustafsson
Mattias Nyström
Adam Wiå
Assisted by
George Jöngren
Equalizer-coefficients during
receiving 10000 bits BPSK Symbol-constellation
for a 3 meter transmission Graphs over data in the receiver Group ORANGE Year 2000 http://www.s3.kth.se/signal/local/www/edu/projekt/students/00/orange Receiver Methods
Modulation method: Coherent BPSK
Diversity method: Modified MRC
DFE MMSE equalizer, implemented as a FIR filter, is used to combat the severe intersymbol interference introduced by the acoustic channel. Objective
Implement a digital acoustic comunication system with two branch diversity between two PC:s operating in real time. The PC:s are equipped with DSP-cards. Overview of the communication system
Power
Sync
(S)
Guard (G)
Block 1
Block 0
Block 2 256 256 256 256 192 512 Initial State Block Stage 2 2 2
Training (Tr)
Data
G G G G Tr/S Block 0 Block 1N 16 16 16 16 224 24 200 Overview of transport protocol Specifications
Low bit error probability.
High average transmission rate.
Distance between speaker and microphones: >3m
Robust against multipath propagation.
Real ...
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