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A Practical Guide to WiMAX Antennas: MIMO and Beamforming Technical Overview
White Paper Revolutionary multiple antenna techniques at the base station and end-user device, paired with sophisticated signal processing, can dramatically improve the communications link for the most demanding application scenarios including heavily... [21 May 2008]
Effective Throughput: A Unified Benchmark for Pilot-Aided OFDM/SDMA Wireless Communication Systems
White Paper This paper studies the uplink performance of an orthogonal frequency division multiplexing (OFDM) wireless system where multiple antennas are utilized at the base station (BS). Further, capacity can be greatly enhanced through spatial division... [10 Apr 2008]
Performance Measurement of 802.11a Wireless Links From UAV to Ground Nodes With Various Antenna Orientations
White Paper By comparing the performance of 32 simultaneous pairs of UAV and ground station configurations, it is able to conclude that, in order to achieve the highest throughput under a typical flyover UAV flight path, both the UAV and the ground station... [23 Aug 2007]
The Performance of OFDM-SDMA Systems With Power Amplifier Non-Linearities
White Paper In this paper, the effects of amplifier nonlinearities is evaluated in OFDM with Space-Division-Multiple-Access (SDMA).This paper shows that nonlinear power amplifier reduced dramatically the performance of multiple-antennas OFDM systems. [11 Apr 2007]
Peter Cochrane's Blog: Wi-fi London
Comment As with my prior UK rural survey - see my earlier blog - this didn't involve any special equipment or antennas, only a standard laptop with a software wi-fi sniffer. During the past few weeks I have completed a wi-fi survey of London in order to... [31 Jan 2007]
Photos: The legendary satellite dishes of Goonhilly
Photo Some of the antennas have been given names including Arthur and Guinevere because of the links between Cornwall, King Arthur and Celtic mythology. This is Guinevere, aka Goonhilly 3, one of the dishes at BT's Goonhilly satellite earth station. [22 Aug 2006]
Smart Antennas for Wireless CDMA Systems
White Paper One of the avenues of possible performance improvement that has not received as much attention is the use of multiple antennas at the base station (and possibly at the mobile handset as well). Multiple antennas can be used for beam steering and... [16 Jun 2006]
Transmit Selection Diversity for Unitary Precoded Multiuser Spatial Multiplexing Systems With Linear Receivers
White Paper This paper proposes two pre-coding methods that use extra transmit antennas, beyond the minimum required, to provide additional degrees of diversity. In this paper, the downlink of a MultiUser Spatial Multiplexing (MUSM) communication system is... [17 May 2006]
A Fourth-Generation MIMO-OFDM Broadband Wireless System: Design, Performance, and Field Trial Results
White Paper Increasing demand for high-performance 4G broadband wireless is enabled by the use of multiple antennas at both base station and subscriber ends. Multiple antenna technologies enable high capacities suited for Internet and multimedia services, and... [28 Mar 2005]
Receiver Antenna Diversity Using the EMS Wireless Mirrorcell Select CDMA Repeater
White Paper With such a scheme, signals from two reverse link receiving antennas at the repeater site are combined using a proprietary EMS Wireless/Qualcomm technique, then amplified and retransmitted to the donor base station. [24 Jul 2004]
Airborne CDMA Cellular System Demonstration Report
White Paper All components were COTS (Commercial-off-the-Shelf), including the plane’s cellular antennas, cables, power inverters, and cell phones. QUALCOMM supplied a deployable CDMA cellular base station mounted in transit cases and CDMA handsets to the... [02 Mar 2004]
A New Class of Precision UTC and Frequency Reference Using IS-95 CDMA Base Station Transmissions
White Paper Like cell phones, these products operate indoors without external antennas and provide unprecedented value to a large class of users in terms of accuracy, cost and ease of installation. This paper introduces a new class of precision timing and... [02 Mar 2004]
On Polarization Transmit Diversity in CDMA Régimes
White Paper This paper considers transmit diversity schemes applied to cross-polarized linear antennas at cellular base stations, with a single linearly polarized antenna used by the mobile station receiver. The performance of Space-Time Block Code (STBC) and... [25 Feb 2004]
Remote RF is Becoming a Mainstream Solution
White Paper This paper examines the technologies and applications associated with the extension of the connection between a wireless radio base station and its antennas. The extension of this connection allows wireless operators to provide wireless service to... [25 Feb 2004]
Software Radio Architecture with Smart Antennas: A Tutorial on Algorithms and Complexity
White Paper The software radio computational model is then expanded to characterize a network with smart antennas. This shows that by using smart antennas, each user can transmit with much lower power and therefore the system capacity increases significantly. [25 Feb 2004]
