Title :
An Efficiency Degradation Model of Power Amplifier and the Impact against Transmission Power Control for Wireless Sensor Networks
Author :
Mikami, Shinji ; Takeuchi, Takashi ; Kawaguchi, Hiroshi ; Ohta, Chikara ; Yoshimoto, Masahiko
Author_Institution :
Kanazawa Univ.
Abstract :
To extend an available period of wireless sensor networks, transmission power control is regarded as one of the promising schemes. In most of the previous studies on the transmission power control, it is assumed that a transmitter has power consumption of O(dm), where d and n denote a maximum communication distance and a pass loss factor. This assumption would substantially hold under the condition that the transmission efficiency is always constant at any transmission power (efficiency-fixed model). In practice, however, the transmission efficiency degrades as the transmission power is reduced. We analytically verify that an actual power amplifier with the efficiency degradation has a power consumption of O(dr), where n/2.8 les r les n/2 (efficiency-degradation model). The efficiency-degradation model gives the negative impact against the transmission power control
Keywords :
power amplifiers; power control; radiofrequency amplifiers; telecommunication control; wireless sensor networks; efficiency degradation model; efficiency-degradation model; efficiency-fixed model; power amplifier; transmission power control; wireless sensor networks; Degradation; Energy consumption; Impedance; Power amplifiers; Power control; Propagation losses; Radio frequency; Radio transmitters; Radiofrequency amplifiers; Wireless sensor networks; Wireless sensor network; pass loss factor; transmission efficiency; transmission power control;
Conference_Titel :
Radio and Wireless Symposium, 2007 IEEE
Conference_Location :
Long Beach, CA
Print_ISBN :
1-4244-0445-2
Electronic_ISBN :
1-4244-0445-2
DOI :
10.1109/RWS.2007.351864