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Co-location in wireless system

Last Updated: April 04, 2010

Question: How can a Co-located Wireless system be established?

Response: Managing co-location can be achieved in a variety of ways. For WirelessUSB LP systems
the primary mechanisms are to distinguish systems based on channel, PN code, and CRC seed. There are trade offs
associated with each of these parameters.
Designers have to determine how many systems may need to be co-located together. This has to be weighed against the interference environment, and possibly even other considerations, such as throughput. If only a few systems ever
need to operate close together, then separation by channel may be sufficient. But channel selection is also part of the
interference avoidance technique. Therefore, if there are more systems, PN code and/or CRC may need to be used
as well. If the throughput requirements are high, then designers also have to consider the effects of two systems
sharing a channel, but on different PN codes or CRC seeds. Systems on different PN codes may still see each others transmissions as increased noise. And systems that are only differentiated by CRC seed actually have to share bandwidth; they will receive each other’s data and reject it only after evaluating the CRC seed.

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