OQPSK modulation technique is used for designing Zigbee transceiver worldwide since several years of invention of ZigBee technology. It provides good battery life, better range and various other advantages for which Zigbee technology is known. But here we are discussing about the transceiver performance over the noisy channel. In noisy channel, we are proposing MSK based Zigbee technology and c...

OBJECTIVES: The aim of this study was to investigate the efficacy of ultrasound as a guiding tool for simulated cervical facet joint injections in cadavers. METHODS: A total of 40 ultrasound examinations at 5 levels (C6-7 to C2-3) were performed on 4 embalmed cadavers. The zygapophyseal joints were located with ultrasound. First, the transverse processes of C6 and C7 were established and the fa...

A baseband digital narrow-band FM receiver, called zero-intermediate frequency zero-crossing demodulator (ZIFZCD), has been recently developed. This demodulator may offer low complexity and simple implementation. However, the bit error rate (BER) performance of the ZIFZCD is inferior to that of the limiter-discriminator-integrate-and-dump (LDI) demodulator. In this paper, a simple decision feed...

Meteor-scatter communication was first described in the pages of QST in 1953 as a means for communicating on dead 15 and 20 m bands. Hams soon realized that even more impressive results could be obtained at 6 and 2 m, where background noise levels are much lower and useful low-elevation gain is obtainable with relatively modest antennas. Early meteor-scatter (MS) contacts used CW and relied on ...