In 揚erformance of multi-carrier DS CDMA Systems?we apply a multi-carrier signaling technique to a direct-sequence CDMA system, where a data sequence multiplied by a spreading sequence modulates multiple carriers, rather than a single carrier. The receiver provides a correlator for each carrier, and the outputs of the correlators are combined with a maximal-ratio combiner. This type of signaling has the desirable properties of exhibiting a narrowband interference suppression effect, along with robustness to fading, without requiring the use of either an explicit RAKE structure or an interference suppression filter.
Rayleigh Fading Ampalitude without Phase Fading, The key point for ONES is that, in some modulation schemes like DPSK the phase error can not destroy the results.
a carrier sense multiple access
with collision avoidance (CSMA/CA) based
MAC protocol, called nanoMAC, suitable for
low bit-rate, low-power wireless devices with
high efficiency
