Carrier Phase Synchronization of Multiple Distributed Nodes in a Wireless Network
Stefan Berger and Armin Wittneben
8th IEEE Workshop on Signal Processing Advances for Wireless Communications (SPAWC), Helsinki, Finland, June 2007.
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In this work we present a method for achieving global carrier phase synchronization in a wireless network of distributed, autonomous nodes. Other authors who have investigated this problem mainly focus on a master/slave strategy based on one master broadcasting a sinusoidal reference signal to all slaves. We follow a slightly different approach where the slaves concurrently or sequentially transmit a broadband sequence to the master. Receiving the conjugate complex of the bounced-back signal, each slave can locally determine the phase difference between its own and the master's local oscillator (LO). This information suffices to allow for coherent cooperation.
The broadband nature of the used sequences makes our approach robust to deep fades in a frequency-selective environment. We revisit the popular strategy for global carrier phase synchronization using the sinusoidal reference and compare it to our own approach. A potential application then stresses the benefits of our scheme.
Distributed Nodes, Carrier Phase Synchronization, Distributed Wireless Network
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