This paper presents a Smart Farm system, which is based on Ultra Narrow Band (UNB) communication technology. As to the characteristics of large area and high livestock mobility on the farm, using traditional communication technology have the problems of high cost, high power consumption and difficult power supply, however, UNB can achieve a high spectrum utilization efficiency and reduce the power consumption. At first, this paper introduces the Minimum Side-Band (MSB) modulation technology which is one kind of the UNB technologies. Secondly, the key issues of digital demodulation is discussed. And then, a MSB transmission system include digital modulation and demodulation is designed and simulated. Finally is the design of Smart Farm based on UNB technology and the summary of the whole work.
[1]
Floyd M. Gardner.
Properties of Frequency Difference Detectors
,
1985,
IEEE Trans. Commun..
[2]
H. R. Walker.
VPSK and VMSK modulation transmit digital audio and video at 15 bits/sec/Hz
,
1997
.
[3]
Minzan Li,et al.
Development of farming PDA based on the zigbee wireless sensors network and GIS
,
2010,
2010 World Automation Congress.
[4]
Marvin K. Simon,et al.
Optimum Performance of Suppressed Carrier Receivers with Costas Loop Tracking
,
1977,
IEEE Trans. Commun..
[5]
Jürgen Tusch.
On Frequency Sweeping in Phase-Locked Loops
,
1984,
IEEE Trans. Commun..