Architectures matérielles pour la technologie WCDMA étendue aux systèmes mulit-antennes

Abstract : Over the last ten years, multi-antenna systems (MIMO) for mobile and fixed wireless commu- nications have revolutionized the possibilities offered for numerous telecommunication application domains. Using multiple antennas at both ends of the link considerably increases the capacity of wireless systems. However, the digital algorithms needed to realize these systems are complex and constitute a challenge in order to define powerful hardware architectures. The goal of the present work centers specifically on the optimal definition of architectural solutions to combat this problem in a CDMA context. The first aspect of this work is a deepened study of space-time algorithms and design methods with regards to an efficient hardware implementation. Numerous detection schemes are proposed in the litterature and are applicable following three criteria : quality of service, binary throughput and algorithmic complexity. The latter constitutes a strong limitation for a low cost implementa- tion of mobiles including these applications. Thus, it is necessary to use powerful tools to simulate, evaluate and rapidly prototype these new systems which constitute likely candidates for fourth generation telecommunication systems. The second aspect is the realization of an uncoded multi-antenna transceiver, integrating CDMA in a wideband channel case. A WCDMA mono-antenna system, generalized to any an- tenna array, has been integrated and simulated on the Lyrtech rapid prototyping platform. The developped architecture integrates the main baseband processing modules, such as Nyquist filte- ring, multiple path detection and detection itself. The MIMO-WCDMA prototype is characterized by its flexibility with regards to the number of inputs, format of samples, characteristics of the wireless channel and the targeted technology (ASIC, FPGA). The third aspect is more prospective since it introduces new methods to reduce the hardware cost of multi-antenna systems. The principle of dynamic allocation of the fixed point format is presented with the goal of adapting the data encoding according to the wireless channel's cha- racteristics and consequently minimizing the circuit's complexity. Also, the concept of adaptive architectures is proposed to reduce the power consumption in an embedded system according to application context.
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Submitted on : Monday, January 11, 2010 - 10:22:20 PM
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  • HAL Id : tel-00446060, version 1

Citation

Taofik Saïdi. Architectures matérielles pour la technologie WCDMA étendue aux systèmes mulit-antennes. Micro et nanotechnologies/Microélectronique. Université Rennes 1, 2008. Français. ⟨tel-00446060⟩

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