CDMA - CDMA COMMUNICATION CDMA SYSTEM SYSTEM Signaler,...

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Unformatted text preview: CDMA COMMUNICATION CDMA SYSTEM SYSTEM Signaler, Sensorer & System System 31/05/01 2E1366 Project Course in Signal Processing and Digital Communication 1 Project Organisation 31/05/01 2E1366 Project Course in Signal Processing and 2 Project Goals Implementation of a real-time digital acoustic Implementation communication system using CDMA. communication The system should work reliably in a multipath environment. The system should allow for different coding gain to illustrate The the trade-off between data rate and robustness to interference. the 31/05/01 2E1366 Project Course in Signal Processing and 3 What is CDMA? Code Division Multiple Access Multiple users utilizing the same bandwidth Each user is allocated a unique code sequence Robust towards interference 31/05/01 2E1366 Project Course in Signal Processing and 4 Spreading the Signal c(t) +1 PN signal -1 Data signal v(t) +1 -1 Product signal t t v(t)c(t) +1 -1 31/05/01 t 2E1366 Project Course in Signal Processing and 5 Spreading Effects on Spreading Interference Interference f f f 31/05/01 2E1366 Project Course in Signal Processing and 6 BPSK Modulation Why Choose BPSK? Easy to implement Well suited for CDMA 31/05/01 2E1366 Project Course in Signal Processing and 7 Choise of Carrier Frequency White noise Ambiance 31/05/01 2E1366 Project Course in Signal Processing and 8 Communication System cos2πtfc/fs PN Lt p(n) n(n) r(n) h(n) Channel Transmitter 2cos2πtfc/fs g(n) L1 Eq PN Det. Receiver 31/05/01 2E1366 Project Course in Signal Processing and 9 Results 31/05/01 2E1366 Project Course in Signal Processing and 10 Results Maximum transmitted chip rate: Matlab 8000 chip/s DSP 4000 chip/s Maximum transmitted information bit rate: Matlab 1000 bits/s DSP 500 bits/s 31/05/01 2E1366 Project Course in Signal Processing and 11 Possible Improvments Decision on each chip Multiple user implementation Using old equalizer coefficients to Using equalize the training sequence before synchronization before 31/05/01 2E1366 Project Course in Signal Processing and 12 User Interface 31/05/01 2E1366 Project Course in Signal Processing and 13 ...
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This note was uploaded on 12/07/2011 for the course NETWORKING PM taught by Professor P during the Spring '11 term at IIPM.

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