*1 “Xi” (Crossy): “Xi” (read “Crossy”) and its logo are trademarks of NTT DOCOMO. *2 OFDMA: A radio access scheme that uses Orthogonal Frequency Division Multiplexing (OFDM). OFDM uses multiple low data rate multi-carrier signals for the parallel transmission of wideband data with a high data rate, thereby implementing high-quality transmission that is highly robust to multipath (see *3) interf...

We present an inexpensive multi-protocol communication system implemented entirely in software comprised of Global Positioning System (GPS), Wireless Local Area Network (WLAN) and Bluetooth (BT). All three communications protocols share the same Analog to Digital converter and are sampled at the same hardware sampling rate. The hardware sampling clock is provided by a high stability crystal osc...

Future wireless terminals will have to be multiband, multi-standard and able to execute multiple standards concurrently. In this paper we describe a flexible and programmable baseband platform for a large variety of mobile and WLAN standards. For the SDR platform architecture our primary design goal was to find the most flexible and easy-to-program solution within a specified power budget. The ...

The employment of multiple antennas at one side of a communications radio link (multipleinput single-output = MISO) allows for the utilization of the spatial domain by means of signal processing. Beamforming focuses the antenna array pattern into a specific direction and thereby enhances the signal strength. Multiple spatial replicas of the radio signal give rise to spatial diversity, which inc...

Wireless mesh network is an advanced form of wireless network. A wireless mesh network provides a better solution to problems that often arise in cellular and WLAN. Wireless mesh networks (WMNs) are receiving increasing demand as an effective solution to deploy ISP’s wireless last mile access, such as wireless enterprise backbone networks and other applications. Wireless mesh networks (WMNs) pr...

How can a group of distributed secondary users make rendezvous on one among a set of available channels, whose exact content is a priori unknown to the participants? Let us assume that secondary users scan the set of channels, attempting to make rendezvous with each other. Each user has several radios that are concurrently used to achieve rendezvous. We propose two rendezvous algorithms for use...

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