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Design Challenges for Future Wireless Systems
Pages 57-63

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From page 59...
... In this paper I will outline a vision for future wireless systems and then describe some of the inherent technical challenges to realizing this vision. WIRELESS VISION Wireless networks will enable people on the move to communicate with anyone, anywhere, at any time, via a range of multimedia services.
From page 60...
... Because the fundamental characteristics and capacity limits of the wireless channel affect all aspects of the wireless network design, designers cannot just borrow from the networking technologies evolving to support the explosive demand for wired networks, which typically operate over fiber-optic channels with very high data rates and very low probabilities of signal corruption. Neither of these characteristics is enjoyed by wireless channels.
From page 61...
... Thus, determining the capacity limits of wireless channels and developing strategies to achieve transmission data rates close to capacity remains an area for active research. WIRELESS SYSTEM DESIGN CHALLENGES Challenges to making the wireless vision a reality arise at all levels of system design, including the hardware, link, network, and application levels.
From page 62...
... These breakthroughs include: multiple antennas at the transmitter and receiver to increase channel capacity; sophisticated coding strategies to correct channel-induced bit errors; multiuser detection techniques to reduce interference; equalization, spread-spectrum, and multicarrier modulation to reduce self-interference from signal reflections; adaptive modulation to optimize performance over time-varying channels; and dynamic resource allocation for sharing power and bandwidth among multiple users in the system as channel conditions and requirements change. Although these breakthroughs represent significant accomplishments, much more work will be necessary to improve wireless channels.
From page 63...
... In fact, the very notion of a wireless link is somewhat fuzzy because of the nature of radio propagation, and because of the dynamic nature and poor performance of the underlying wireless communication channel. High-performance wireless systems will have to be optimized for this channel and must adapt to its variations as well as to user mobility.


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