Resource Management in Multi-channel Relaying.

摘要

Resource management –particularly power and spectrum management– is becoming increasingly important owing to the fast growing market of smart-phones and other power-hungry wireless devices. While WiFi and cellular communication accounts for a significant portion of the smart-phone power expenditure, spectrum is equally paramount and scarce as well. This demands for an efficient and judicious resource management schemes that is also viable in terms of the practical implementation and complexity. This thesis focuses on the various setups of multi-channel relaying system as an emerging wireless technology, and provides rate optimal, yet easy-to-implement, resource management solutions for them. We exploit the channel pairing (CP) capability of a multi-channel relay node in our design. This capability allows the relay to receive a signal from one channel and transmit a processed version of the signal on a different channel. CP jointly optimized with power allocation (PA), which determines each channel’s power, can lead to significant improvement in spectral efficiency. For two setups, namely multi-hop and multi-user setups, we present the total achievable rates through optimizing CP, PA and channel-user assignment which incurs multi-user diversity. While the achievable rates provide theoretical insight for the performance of such systems, we next incorporate the integer nature of bit loading and rate adaptation, and via an innovative optimization technique, we present the jointly optimal solution to the problem of bit loading, PA and CP.