Synchronization at Low SINR in Asynchronous Direct-Sequence Spread-Spectrum Communications

Authors:
Jaewook Shim;Manish Amde;Kenneth Yun;Rene Cruz
Affiliations:
University of California, San Diego, USA;University of California, San Diego, USA;University of California, San Diego, USA;University of California, San Diego, USA
Venue:
ICSNC '07 Proceedings of the Second International Conference on Systems and Networks Communications
Year:
2007

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

Proceedings of the 4th International Conference on Testbeds and research infrastructures for the development of networks & communities

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Abstract

Currently deployed asynchronous wireless networks, e.g., 802.11a/b/g, have a limited spatial range and low reliability due to their inability to operate at low signal to interference and noise ratio (SINR). Low SINR operation can be achieved using a direct-sequence spread-spectrum (DSSS) based communication with a high spreading gain. The reception at low SINR is limited by the inability to synchronize at a low SINR. In this paper, we present the design of a synchronization block which enables a receiver to synchronize to an incoming packet at a low SINR with a high reliability. It leverages an algorithm for code acquisition in asynchronous packet-based reception described in [1]. The design of this block also consists of novel algorithms for code tracking, frame synchronization and multipath search for RAKE combining. A payload based on binary orthogonal signaling is attached to the packet header to complete an asynchronous packet-based system. The simulation results show that each of the synchronization algorithms as well as the entire synchronization block operate reliably at low SINR at the input of the receiver.