An Acoustic Communication System Using Structured Interference Suppression: Performance Evaluation and Real Time Implementation
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Interference from other users is often a considerable problem in modern wireless systems. The pursuit for increased capacity means that many users often share a common frequency band which makes the transmission susceptible to interference. A well known example is the GSM system which uses Time Divvision Multiple Access (TDMA) to separate the users. This thesis considers interference suppression in an acoustic communication system us- ing Binary Phase Shift Keying (BPSK) modulation. A conventional equalizer is compared to a recently developed method which exploits the structure of BPSK modulation. The communication system is simulated and also implemented in real time, in order to assess the in uence from the nonideal behaviour of a true system. The real time implementation relies on assembler programs running on Digital Signal Processors (DSP:s). The theoretical results and measurements will show that an improvement of the per- formance is obtained when the structured method is used. The real time implementation allows easy demonstration of this fact by allowing the user to interactively switch equalizer while the received signal constellation and estimates of the biterror probability and SNR are displayed. A great deal of e ort has been spent optimizing the assembler programs to obtain the necessary processing power.
Place, publisher, year, edition, pages
Dept. of Signals, Sensors & Systems, Signal Processing, 1998.
EES Examensarbete / Master Thesis, IR-SB-EX-9828
Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-96589OAI: oai:DiVA.org:kth-96589DiVA: diva2:531336
Master of Science in Engineering - Electrical Engineering
Ottersten, Björn, Professor