Authors: Luc Deneire Jerome Lebrun
Publish Date: 2012/04/04
Volume: 64, Issue: 3, Pages: 473-487
Abstract
The physical layers of wireless robotics take advantage of current standards like Bluetooth Wifi etc each of them addressing a specific segment of wireless robotics Wireless robotics has a wide range of needs comprising low power robustness and high data rate when video is used as well as the opportunity to use a large number of transceivers To cover these needs and take benefit from these opportunities we propose a new physical layer based on continuous phase modulation CPM and spacetime coding CPM already used in some standards like GSM and Bluetooth enables the development of low power devices but presents a low spectral efficiency Spacetime coding on the other hand yields high spectral efficiency as well as enhanced robustness against the wireless channel Moreover spacetime coding can take benefit of the large number of transceivers using cooperative communications In this paper after analysing the opportunities given by wireless robotics as well as its specific needs we propose a new physical layer based on L 2orthogonality for nonlinear spacetime codes L 2orthogonality of our codes is ensured by a bank of phase correction functions maintaining phase continuity but at the same time enabling low complexity decoding We show that the code achieves full diversity and has full rate for any number of transmit/receive antennas and any CPM parameter
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