Nonstationary interference excision in spread spectrum communications using projection filtering methods.
A new nonstationary interjerence excision technique in direct sequence spread spectrum (DSSS) communication is introduced. This technique is based on the notion that both the additive noise and the DSSS signal cover the entire time-frequency(t-f) domain, whereas the jammer occupies a small t-f regio...
| Main Authors: | , |
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| Format: | |
| Language: | English |
| Published: |
1998
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| Online Access: | http://ezproxy.villanova.edu/login?url=https://digital.library.villanova.edu/Item/vudl:173516 |
| Summary: | A new nonstationary interjerence excision technique in
direct sequence spread spectrum (DSSS) communication
is introduced. This technique is based on the notion that
both the additive noise and the DSSS signal cover the entire
time-frequency(t-f) domain, whereas the jammer occupies a
small t-f region. A projection filter is constructed using the
jammer underlying t-f signature or its expected occupancy
region in the t-f domain. The filter output is either directly
despreaded orfirst subtracted from the input data and then
despreaded by the PN sequence, depending on whether the
jilter passes or removes the jammer signal. We derive the
SNR of the DSSS receiver implementing the projection filters
and discuss its relation to existing excision methods
based on instantaneous frequency information. |
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