Development of Collapse-Sensing Phone for Emergency Positioning System

Abstract

To accommodate emergencies involving the solitary aged, we have developed a collapse-sensing phone with a GPS receiving chipset and a CDMA sending chipset that reports the location of the individual to a local control center. A GIS has been developed to display the position of the caller on the map of a control system that enables administrative officers to rescue the aged people.

Implementation of Knowba Filtering Method for Intereference Rejection in NBDSSS

“…In addition, the safety may also be improved along with the low power characteristic, since the truncation of the spread spectrum signals acts as noise for the band-limited receivers and cannot be intentionally intercepted and blocked without the prior information about the spread spectrum signaling scheme. This type of signal is therefore categorized as a signal with low probability of interception (LPI) [24 ]. The principle of immunity from interference with inter-symbols (ISI) brought about by signaling the spread spectrum.…”

Literature Review of Spread Spectrum Signaling: Performance, Applications and Implementation

“…Briefly speaking, by utilizing a large amount of bandwidth, the immunity against a variety of interference can be improved significantly and high reliability is obtained [7]. This is crucial for some special communication channels used for rescue, military purposes and other emergencies [20]- [22]. Also, since the bandwidth is large enough, the corresponding transmitter power can be reduced, which is more energyefficient and suited to be implemented for some special occasions when a strict transmitter power limit is placed [23].…”

“…Substituting (22) and into (21) yields (23) Assuming (7, 3) coding scheme is employed and the average , we can simulate the relationship given in (23) and plot the result in Fig. 7.…”