A real time, 2 Mbps to 150 Mbps portable SDR unit with MIMO and sensing capability which exposes all the PHY parameters to the higher layers will help advance experimental cognitive radio (CR), and wireless networking research. The current SDR implements a slight variant of the 802.11n draft specification, with the entire baseband implemented on a single Xilinx Virtex II 8000 device using comme...

The IEEE 802.11b is a Direct Sequence Spread Spectrum (DSSS) system very similar in concept to the CDMA Wireless, using a spread spectrum chip sequence. In the 802.11b the transmission medium is wireless and the operating frequency band is 2.4GHz. 802.11b provides 5.5 and 11 Mbps payload data rates in addition to the 1 and 2 Mbps rates provided by 802.11. To provide the higher rates, 8 chip Com...

Overview Long Term Evolution (LTE) is the next step forward in cellular 3G services. Expected in the 2008 time frame, LTE is a 3GPP standard that provides for an uplink speed of up to 50 megabits per second (Mbps) and a downlink speed of up to 100 Mbps. LTE will bring many technical benefits to cellular networks. Bandwidth will be scalable from 1.25 MHz to 20 MHz. This will suit the needs of di...

The Universal Mobile Telecommunication System (UMTS) is a third generation (3G) mobile communications system that provides a range of broadband services to the world of wireless and mobile communications. The UMTS delivers low-cost, mobile communications at data rates of up to 2 Mbps. It preserves the global roaming capability of second generation GSM/GPRS networks and provides new enhanced cap...

A typical Data Acquisition System (DAS) consists of individual sensors with the necessary signal conditioning, data conversion, data processing, multiplexing, data handling and associated transmission, storage and display data. This paper describes the DAS that is very useful in keeping track of data from sensors recording values from the environment in real time. The data collected from the se...

This paper modelled an effective video conferencing application over an existing wireless network. The topology of an existing wireless network was obtained and simulated using the Riverbed Modeler 17.5 software with a view to determining if the existing wireless network was capable of running a video conferencing application. The Riverbed Modeler 17.5 software was used to model and simulates t...

For high-mobility 4G applications of LTE-A and WiMAX-2 systems, this paper presents a dual-standard turbo decoder design with the following three techniques. 1) Circular parallel decoding reduces decoding latency and improves throughput rate. 2) Collision-free vectorizable dual-standard parallel interleaver enhances hardware utilization of the interleaving address generator. 3) One-bank extrins...

While bandwidth for previous IP backbone networks deployed by Internet Service Providers typically has been limited to 34 Mbps, current and future IP networks provide bandwidth ranging from 155 Mbps to 2.4 Gbps. Thus, due to emerging network technologies cooperative Web caching among institutional proxy caches residing a wide area backbone network shows great promise to become an effective appr...

The usable throughput of an IEEE 802.11 system for an application is much less than the raw bandwidth. Although 802.11b has a theoretical maximum of 11 Mbps, more than half of the bandwidth is consumed by overhead leaving at most 5 Mbps of usable bandwidth. Considering this characteristic, this paper proposes and analyzes a real-time distributed scheduling scheme based on the existing IEEE 802....