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A Baseband Demonstrator Using Multi Antenna Techniques to Improve Capacity of Fixed Broadband Wireless Access

Rosson, P.; Chenu-Tournier, M.; Noguet, D.

Wireless Personal Communications 36(4): 317-338

2006

ISSN/ISBN: 0929-6212
DOI: 10.1007/s11277-005-9010-9
Accession: 080947948

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Summary
In the last five years, transmissions using multiple sensors at both ends of the link have been a major research topic. Many transmission schemes are studied such as point to point links using diversity coding, point to point links using multiplexing, tradeoffs between both and at last multi-point to point links. This last scheme was already covered by Space Division Multiple Access (SDMA) processing but a step forward was made with multiple subscriber detection. This paper asses the multi-point to point links for uplink and point to multi-point for the downlink based on Ofdm waveform in the frame of the Wireless Metropolitan Area Network (WMAN) Ieee Std 802.16-2004 or Hiperman standard. It describes a realistic implementation of transceivers for Physical (PHY) layer to Medium Access Control (MAC) layer allowing a system capacity increase with minor modifications of the standard and with a low impact on the complexity of the subscriber equipment. In this context, this paper proposes to focus on based-band techniques: The Obèle algorithm based on the channel knowledge in the downlink and multiple-user detection in the uplink. The algorithm complexity and the tradeoffs for implementation are extensively discussed.

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