Abstract
The Chirp Spread Spectrum(CSS) based wireless communication has been widely used in Wireless Sensor Network(WSN). These sensors generally have slow speed, and is becoming more demand for higher data rate. However, due to the low transmission rate of CSS, there are still many problems to be studied. A new modulation method based on the linear chirps is introduced in this paper. Unlike the BOK(Binary Orthogonal Keying) and DM(Direct Modulation) methods, this modulation technique is to implant Doppler frequency shift into the linear chirps. M-ary modulation is realized in a single pulse by this proposed modulation technique. Demodulation is accomplished by calculating the position of the compress pulse peak within the pulse duration, or by using different reference chirp signals in the matching filter.
Highlights
The Chirp signal which frequency varies over time was introduced to communication system by Winkeler [1] in 1960s
(2) We provide the ability of using the ID-CSS modulation method to realize M-ary chirp modulation in a single pulse
The incoming chirp comes from the transmitter, which should be implanted with Doppler frequency shift. 3.1 Method 1 One way is to use two different parabolic phases
Summary
The Chirp signal which frequency varies over time was introduced to communication system by Winkeler [1] in 1960s. Gott analyzed the performance of the narrow and wide band chirp signals by using orthogonal signal and match filter techniques [2] in 1970s, and concluded that bandwidth of such a communication system is little relevant. He introduced the differential encoding to the binary data in [3]. The chirp spread spectrum became an important modulation technique of the IoT. We propose another modulation method besides BOK and DM modulation techniques In this method the Doppler effect is implanted into the chirp signal at the transmitter. (2) We provide the ability of using the ID-CSS modulation method to realize M-ary chirp modulation in a single pulse
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