A 300 MHz SAW matched filter with reduced mismatch-loss and with a coded transducer by a low autocorrelation sidelobe sequence has been developed for 1 Mbps SS low power-transmission wireless communication modem. This low autocorrelation sequence of 25 chips was searched out to apply DS spreading DPSK signal. The sequence reduced output signal sidelobe 6 dB lower than 31 chip m-sequence, further obtained higher processing gain than that of Barker sequences. Furthermore, to reduce mismatch-loss in temperature stable SAW matched filters, a localized layered structure has been developed. ZnO is deposited only on the normal transducer on a ST-cut quartz substrate, reducing the mismatch-loss by 9 dB. A SS radio modem unit using this SAW matched filter shows a bit error ratio lower than 10-4 with a low current consumption 210 mA, considering such a high data rate 1 Mbps and a low received power -100 dBm.
|Number of pages||6|
|Publication status||Published - 1996 Dec 1|
|Event||Proceedings of the 1996 4th International Symposium on Spread Spectrum Techniques & Applications, ISSSTA'96 - Mainz, Ger|
Duration: 1996 Sep 22 → 1996 Sep 25
|Other||Proceedings of the 1996 4th International Symposium on Spread Spectrum Techniques & Applications, ISSSTA'96|
|Period||96/9/22 → 96/9/25|
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