Title :
One chip demodulator using RF front-end SAW correlator for 2.4 GHz asynchronous spread spectrum modem
Author :
Nakase, H. ; Kasai, T. ; Nakamura, Y. ; Masu, K. ; Tsubouchi, K.
Author_Institution :
Res. Inst. of Electr. Commun., Tohoku Univ., Sendai, Japan
Abstract :
A new compact 2.4 GHz spread spectrum (SS) modem has been implemented using a surface acoustic wave (SAW) correlator. The authors have designed and fabricated the 2.4 GHz SAW correlator on AlN/Al2 O3 combination. Using the SAW correlator and SAW delay line at the RF front-end, the 2.4 GHz SS signal is directly demodulated to baseband data. The PN code used is the 11-chip Barker code whose rate is 22 MHz, and baseband data rate is 2 Mbps. The degradation of the measured BER from the theoretical limit is found to be less than 3 dB of Eb/N0. The authors propose a time division multiplex scheme utilizing the orthogonality of the spreading PN code in the time domain. The channel multiplex is experimentally confirmed using shifted Barker codes
Keywords :
digital signal processing chips; 11-chip Barker code; 2 Mbit/s; 2.4 GHz; 2.4 GHz asynchronous spread spectrum modem; 3 dB; AlN-Al2O3; AlN/Al2O3 combination; BER; PN code; RF front-end; RF front-end SAW correlator; SAW delay line; baseband data rate; degradation; one chip demodulator; orthogonality; surface acoustic wave correlator; time division multiplex scheme; time domain; Acoustic waves; Baseband; Correlators; Delay lines; Demodulation; Modems; RF signals; Radio frequency; Spread spectrum communication; Surface acoustic waves;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 1994. Wireless Networks - Catching the Mobile Future., 5th IEEE International Symposium on
Conference_Location :
The Hague
Print_ISBN :
90-5199-193-2
DOI :
10.1109/WNCMF.1994.530826
