简介: |
This research-oriented presentation is based on the Wiley/IEEE Press monographs [1, 2] and considers the joint benefits of both adaptive physical and adaptive network-layer performance enhancement techniques, with special emphasis on the latter. More specifically, conventional systems would drop a call in progress, if the communications quality falls below the target quality of service and it cannot be improved by handing over to another physical channel. By contrast, the adaptive transceivers of the near future are expected to simply ’instantaneously drop the throughput, rather than dropping the call’ by reconfiguring themselves in a more robust mode of operation. It is demonstrated that the proposed beam-forming and adaptive transmission techniques may double the expected teletraffic capacity of the system, whilst maintaining the same AVERAGE performance as their conventional fixed-mode counterparts.
We explore the inherent implications of the bandwidth versus power efficiency criteria routinely employed to characterize wireless communication systems. We stress the pressing importance of the power efficiency-related green radio considerations in the context of contemporary as well as future wireless networks. Finally, we carry out a top-down analysis of a hypothetical commercial wireless network and demonstrate that the appropriate choice of the optimization criterion has a profound influence on the overall network performance.
[1] L. Hanzo, J.S. Blogh, S. Ni: 3G Systems and Intelligent HSDPA-Style FDD versus TDDWireless Networking – Smart Antennas and Adaptive Modulation, JohnWiley, January, 2008
[2] L. Hanzo, L-L. Yang, E-L. Kuan and K. Yen: Single- and Multi-Carrier CDMA: Multi-User Detection, Space-Time Spreading, Synchronisation, Standards and Networking, IEEE Press - John Wiley, June 2003, 1060 pages
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