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.
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
Combined Processing of
GPS, GLONASS, and SBAS
Code Phase and Carrier Phase Measurements
Lambert Wanninger, Stephan Wallstab-Freitag
Geodetic Institute, Dresden University of Technology, Germany
Carrier Board for Gumstix Verdex Pro.
Has 2 - 30A motor drivers for robotic loco motion
PIC micro handles motion control.
USB host signals.
USB console connector
AC97 audio CODEC
Exapnsion headers for PIC micro.
Multi-Carrier modulation? Orthogonal Frequency Division Multi-
plexing (OFDM) particularly? has been successfully applied to
a wide variety of digital communications applications over the past
several years. Although OFDM has been chosen as the physical layer
standard for a diversity of important systems? the theory? algorithms?
and implementation techniques remain subjects of current interest.
This is clear from the high volume of papers appearing in technical
journals and conferences.
Since the principle of multi-Carrier code division multiple access (MC-CDMA) was
simultaneously proposed by Khaled Fazel et al. and Nathan Yee et al. at the IEEE
International Symposium on Personal, Indoor and Mobile Radio Communications
(PIMRC) in the year 1993, multi-Carrier spread spectrum (MC-SS) has rapidly become
one of the most wide spread independent research topics on the field of mobile radio
communications. Therefore, the International Workshop on Multi-Carrier Spread
Spectrum (MC-SS) was initiated in the year 1997. Multi-Carrier and spread spectrum
systems with their generic air interface and adaptive technologies are considered as
potential candidates to fulfill the requirements of next generation mobile communications
systems.
