A low SINR synchronization system for direct-sequence spread-spectrum communications: radio prototype, verification testbed and experimental results

Authors:
Manish Amde;Jaewook Shim;Joel Marciano;Kenneth Yun;Rene Cruz
Affiliations:
University of California, San Diego;University of California, San Diego;University of Philippines;University of California, San Diego;University of California, San Diego
Venue:
Proceedings of the 4th International Conference on Testbeds and research infrastructures for the development of networks & communities
Year:
2008

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Abstract

Ability to receive signals at low signal to interference and noise ratio (SINR) improves the spatial range and reliability of wireless networks. However, it is difficult to design a communication system that operates correctly in this type of environment. Our system uses a high spreading gain in the direct-sequence spread-spectrum (DSSS) modulation to combat the problems associated with low SINR. Undoubtedly, synchronization is a severe bottleneck for low SINR reception in DSSS. In this paper, we present a prototype hardware implementation of a DSSS synchronization system, which was proposed in [1], a testbed, and experimental results. The synchronization system is implemented on a reconfigurable radio prototyping platform and verified on a hardware testbed. Controlled experiments are performed in the laboratory to calibrate its performance. Finally, over-the-air experiments are conducted at two outdoor test sites and the results are presented.