Exploiting Processing Gain in Wireless Ad Hoc Networks Using Synchronous Collision Resolution Medium
October 2005
John A. Stine, The MITRE Corporation
ABSTRACT
Signal spreading is used in military wireless networks
to make them more difficult to detect, jam, and intercept.
With signal spreading comes the opportunity to use code division
multiple access (CDMA) to create multiple channels using the
same spectrum. The requirement for all nodes in ad hoc networks
to receive broadcast transmissions from any of their neighbors has
made implementing channelization schemes impractical, especially
with contention protocols. When CDMA is the method of channelization,
then the near far effect must also be addressed. In this
paper, we describe these challenges and then how the contention
based medium access control protocol, Synchronous Collision
Resolution (SCR) solves them. We describe how SCR creates a
geometry of transmitters that benefits from using CDMA. We
provide results of several different types of simulation experiments
that demonstrate the relative benefits of different levels of
processing gain. We demonstrate that tuning SCR for the available
processing gain dramatically improves throughput.
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