Abstract
Electromagnetic waves are inevitably scattered by various objects when they propagate through the environment, creating a complex, and usually unpredictable, multipath communication channel. This chapter is dedicated to the signal modulations in backscatter communications and their associated hardware realization. It introduces the basic principle of backscatter modulation and discusses some commonly adopted schemes, leaving two recently developed more advanced modulation schemes that is Chirp Spread Spectrum (CSS) and multicarrier modulation. The commercial radio frequency identification systems employ the simplest form of the Amplitude Shift Keying scheme, which is on-off-keying. Since modulation in the frequency domain is more resilient to noise compared with modulation in the amplitude domain, the Frequency Shift Keying -based backscattering modulation was developed for different orders. CSS is a spread spectrum technique that employs linear frequency-modulated chirp signals to encode information.
| Original language | English |
|---|---|
| Title of host publication | Backscattering and RF Sensing for Future Wireless Communication |
| Editors | Q. H. Abbasi, H. T. Abbas, A. Alomainy, M. A. Imran |
| Publisher | Wiley |
| Pages | 19-41 |
| Number of pages | 23 |
| ISBN (Electronic) | 9781119695721 |
| ISBN (Print) | 9781119695653 |
| DOIs | |
| Publication status | Published - 9 Apr 2021 |
Keywords
- amplitude shift keying
- backscatter communications
- chirp spread spectrum modulation
- common schemes
- frequency shift keying
- multicarrier modulation
- signal modulation schemes