Broadband access is the key driver of the telecommunications industry today. Customers all around the world demand this service to surf the
World Wide Web (WWW) and to communicate by email. Furthermore, the classical Internet undergoes a shift towards a collaborative (second
generation) Internet of people. The WWW is used as a platform to establish social networks and to share self-generated content. People download and
upload rich multimedia content. They want to be connected. In metropolitan areas, fixed Broadband Wireless Access (BWA) offers a costeffective
alternative to wired broadband access technology such as Digital Subscriber Line (DSL) and cable modem. In rural areas, fixed BWA can bridge the digital divide by bringing broadband services to remote places. Finally, BWA technology provides market potential for portable and mobile
broadband services. IEEE 802.16 (or WiMAX) is a promising radio access technology that performs similar to wired access systems and covers large geographic regions. The key feature to reach that goal is the integration of multi antenna techniques. Beamforming is the most promising MIMO technique since it allows for both, increased system capacity and extended cell coverage. The thesis describes the developed comprehensive system concept to fully integrate Space Division Multiple Access (SDMA) technology into the IEEE 802.16 system. SDMA affects a large portion of the WiMAX system. Multiple antennas are required in the PHY layer to form adaptive patterns. Through the newly specified PHY Service Access Point (SAP) the enhanced PHY layer offers its beamforming services to the Medium Access Control (MAC) entities. The extended MAC protocol controls the additional spatial dimension. Multiple access based on Time Division Multiple Access (TDMA) and SDMA need to be coordinated. Besides the protocol, MAC algorithms are affected by beamforming and SDMA. The hierarchical TD-SD-OFDM scheduling algorithm proposed in this work optimizes resource allocation while observing strict real-time constraints.
Christian Hoymann
IEEE 802.16 Metropolitan Area Network with SDMA Enhancement
1. Auflage
254 Seiten
Paperback
Reihe : ABMT
Bandnummer : 57
ISBN : 978-3-86130-936-X
40,40 €
Artikelnummer: 978-3-86130-936-X Kategorie: ABMT
Gewicht | 360 g |
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Größe | 14,5 × 21,0 cm |