Presentation 48,49
PResentation 48
Beamforming And SDMA For Metro WiFi Deployments
Dr. Mati Wax
Wavion
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Current wireless LAN (WLAN) technology, referred to as WiFi, is matured, low cost and is now integrated in a large variety of mobile and handheld devices. The wide adoption of this technology triggered the development of public-access WiFi networks. What started as limited coverage in hot-spots, turned into wider coverage in hot-zones, and recently to much larger metropolitan-area coverage in hundreds of cities across the world. Current metropolitan-area WiFi networks suffer from the limited range of existing Access Points (APs) and their spotty coverage. The limited range leads to dense deployment and consequently to increased cost of deployment and maintenance
Moreover, since the available spectrum is limited, dense deployment leads to self-interfering and hence to reduced rate and capacity. Spotty coverage is a result of poor link gain and multi-paths propagation and leads to dead spots and low rates which have a detrimental effect on the network performance. This paper presents new type ofAP for metro Wifi deployment that is based on multi-antenna (MIMO) technology. The AP uses a 6-antenna array and implements Beamforming for reception and transmission, as well as Spatial Division Multiple Access (SDMA) transmission. These space-time digital processing techniques enable us to double the range and quadruple the capacity compared to a conventional AP, as well as improve the uniformity and quality of the coverage. We present field-test results that demonstrate the performance gains in a typical deployment.
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Presentation 49
Reconfigurable Architecture For Implementation Of Wireless Standards
Prof. Simon Litsyn, Gilad Garon, Doron Solomon
ASOCS
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Flexibility is a critical requirement for portable communication devices that employ increasingly sophisticated and power-consuming processing techniques. The novel approach pioneered by ASOCS allows implementation of a wide variety of communication protocols using the common hardware. This yields a significant cost, performance and/or power savings. The approach is based on a uniform treatment of domains of signal processing algorithms, and their implementation as domain-specific processors (megafunctions) interconnected by a reconfigurable network.
In the presentation we survey the designed megafunctions (orthogonal transforms, matrix-vector operations, and trellis processing), and demonstrate how distinct communication tasks can be implemented on this architecture (e.g. implementation ofconvolutional, turbo-convolutional, LDPC and turbo-product codes). We discuss several basic concepts increasing efficiency and performance of the suggested design: on-line parameters' modification, dynamic loading, per-survivor processing, hardware splitting for concurrent use and vertical hand-off, etc. An example of design for simultaneous implementation of such standards as WLAN, WMAN and UMTS will be analyzed in details.
Finally, we demonstrate how our approach perfectly fits the requirements of the current commercial handsetsrequiring network flexibility and fixed mobile convergence as well as the emerging Super 3G standard.
