Abstract
A chirp spread spectrum (CSS) transceiver architecture for IEEE 802.15.4a is proposed and implemented. In the transmitter, the size of the read-only memory that stores CSS signal samples for the chirp modulator is reduced by removing duplicate samples among subchirps. In the receiver, a matched filter is utilized to remove the other band noise caused by the band hopping property of CSS. A robust time synchronizer and chirp demodulator based on the matched filter are proposed. Low complexity architectures of the matched filter and biorthogonal decoder are also proposed. All of the proposed architectures are implemented in the field-programmable gate array chip and verified.
Highlights
The IEEE 802.15.4a committee adopted chirp spread spectrum (CSS) based on the industrial, scientific, and medical band for a new standard whose objectives are to provide low data rate communications, a high-precision ranging/location capability, low power, and low cost, as in [1]
In the receiver, matched filter-based architecture is proposed in order to remove the other band noise caused by the band hopping property of CSS
Since the samples of the 1st, 2nd, and 3rd subchirps are generated by the reverse indexed and/or conjugate samples of the 0th subchirp as in Section 2, the samples of the reference subchirp for the chirp modulator are composed of only the samples of the 0th subchirp in the proposed transmitter; as a result, the read-only memory (ROM) size is reduced by the amount of 75%
Summary
The IEEE 802.15.4a committee adopted chirp spread spectrum (CSS) based on the industrial, scientific, and medical band for a new standard whose objectives are to provide low data rate communications, a high-precision ranging/location capability, low power, and low cost, as in [1]. A novel transceiver architecture of CSS is proposed and implemented. The low-complexity architecture of the chirp modulator is proposed. In the receiver, matched filter-based architecture is proposed in order to remove the other band noise caused by the band hopping property of CSS. A robust time synchronizer and chirp modulator based on the matched filter are presented. Low-complexity architectures of the matched filter and the biorthogonal decoder are proposed.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
