MAINTAINING USER DEFINED QOS IN PROPOSED MB OFDM COGNITIVE RADIO SYSTEM USING POWER CONTROL AND CHANNEL CAPACITY ANALYSIS AS DESIGN TOOLS FOR SUBCARRIER SELECTION
André Mayers, G.V.S. Raju · 2011
The objective of this paper is to study various methods of maintaining user defined Quality of Service (QoS) in a wireless Cognitive Radio (CR) System. The agility of CRs can be used to make adjustments to Bit Error Rate (BER), Bit Rate (BR) and transmit Power Spectral Density (PSD). We present a modified channel capacity analytic formula, methods for a power control algorithm, and methods for decision making on spectrum allocation. We show how parameters such as BER, Signal to Interference Noise Ratio (SINR) thresholds, and analysis and design based on our modified channel capacity formula can be subtly manipulated to affect QoS. The power control algorithm is part of a system that maintains user defined BER and BR in the presence of external user interference. This system is a design tool with which to achieve predictable and consistent QoS.