MeshNetics - 802.15.4 / ZigBee Wireless RF Modules MeshNetics is a creator of easy-to-integrate 802.15.4 / ZigBee wireless RF modules and ZigBee PRO-certified mesh networking software, used by OEMs and system integrators to add wireless connectivity to their products and solutions.
MeshNetics RF modules feature industry-leading range performance, long battery life and ultra-small footprint.
They are designed for use in 868/915 MHz and 2.4 GHz frequency bands.
MeshNetics is a single source of ZigBee modules, development tools, networking software, technical support, and design services.
CDMA vs TDMA
During this discussion I will use the generic term 'CDMA' to refer to the IS-95 standard.
Technically speaking, CDMA is only a means to transmit bits of information, while IS-95 is a transmission protocol that employs CDMA.
You may also hear the term 'TDMA' used to refer generically to the IS-136 standard.
Once again, TDMA is only a method of transmitting bits, while IS-136 is a protocol that happens to employ TDMA.
preview:
http://www.arcx.com
paper
The principles of Spread Spectrum communication
In Code Division Multiple Access (CDMA) systems all users transmit in the same bandwidth simultaneously.
Communication systems following this concept are ``spread spectrum systems''. In this transmission technique, the frequency spectrum of a data-signal is spread using a code uncorrelated with that signal.
As a result the bandwidth occupancy is much higher then required.
The codes used for spreading have low cross-correlation values and...
preview:
http://cas.et.tudelft.nl
paper
White Paper: CDMA Network Technologies: A Decade of Advances and Challenges
This paper will briefly describe the origins of CDMA technology and the emergence of 3G implementations such as cdma2000 1X and cdma2000 1x EV-DO. An overview of network topology is included, with a detailed explanation of the role of each element and interface in the network and of protocol testing to address the changing requirements of the network.
preview:
http://www.tek.com
association
3GPP2
3GPP2 was born out of the International Telecommunication Union's (ITU) International Mobile Telecommunications "IMT-2000" initiative, covering high speed, broadband, and Internet Protocol (IP)-based mobile systems featuring network-to-network interconnection, feature/service transparency, global roaming and seamless services independent of location.
preview:
http://www.3gpp2.org
association
CDMA Certification Forum
The CDMA Certification Forum (CCF) is a global forum consisting of leading organizations within the telecommunications industry working towards improving the way CDMA2000 devices are prepared for commercialization.
Using a streamlined and globally standardized certification process, the CCF will enable devices to be adequately tested and certified to be ready for commercialization in an affordable and timely manner.
preview:
http://www.globalccf.org
association
CDMA Development Group
The CDMA Development Group (CDG) is an international consortium of companies who have joined together to lead the adoption and evolution of CDMA wireless systems around the world.
The CDG is comprised of the world's leading CDMA service providers and manufacturers.
preview:
http://www.cdg.org
Mocana NanoSec™. Mocana delivers an open standards based, full featured, RFC compliant Embedded IPsec and IKE solution that also offers IKEv1, IKEv2 and MOBIKE support.
The Mocana NanoSec is a high performance, small footprint software, that resides on a device and provides data confidentiality, integrity and authentication between networked peers at the IP layer.
Mocana NanoSec is uniquely architected with an asynchronous core to fully leverage hardware acceleration.
It is ideally suited to securing voice, video and data networks.
