Introduces the demand for high data rate which drives the mobile communication system from 2G to 3G. Higher data rates in these systems add more performance and specification requirements to mobile phone RF design. In order to achieve the highest bandwidth efficiency in the occupied bands, the third generation mobile communication system uses linear modulation methods to improve the spectral efficiency, such as orthogonal phase shift keying, 8-phase shift keying and

AT89C55WD single-chip computer with watchdog function AT89C55WD with 20K program memory, introduced by ATMEL company, which uses C51 and plug-and-drop FLASH flash memory to design paperless recorder, is an advanced product in 8051 series. The watchdog function can greatly improve the stability of the product, and the large internal program memory can accommodate the software with rich functions.

AT89C55WD, a single-chip computer with watchdog function introduced by ATMEL company, has 20K program memory. It is a more advanced product in 8051 series. The watchdog function can greatly improve the stability of the product, and the large internal program memory can accommodate rich software. Many previous paperless recorders used 3.5 inch floppy disks