Adaptive Throughputs Depend On Channel Quality For Zigbee Transceiver


IEEE 802.15.4 (also known Zigbee) is the standard that has been developed for low cost, low data rate and low power consumption wireless network, in advance Wireless Sensor Network (WSN) need to high throughput and low power consumption. This paper proposed an improved ZigBee transceiver architecture (for 915MHz model) to maximizing throughput to enhance the network performance for high data rate application while maintain compatibility with the essential WSN requirements: low power, low cost, bandwidth, and low complexity. The idea is to design a three code length of Direct Sequence Spread Spectrum (DSSS) with three data rate: 40kbps, 75kbps and 150kbps by modification the chip coding architecture of the modulation process of IEEE 802.15.4. Here we need a channel estimation and Signal to Noise Ratio (SNR) measurement to be on the basis of which the selection of appropriate length of the code and therefore the amount of the data sent. Also in this research we present a detailed technically of such idea, it has been tested, scheduling result, and explained how the system works. The results show that it is possible to apply the idea of increasing the data transfer rate while maintaining the same hardware specifications.