System performance enhancement using power path gain ratio for cognitive radio systems with diverse transmission ranges
Jingxin Chen, David Grace, Paul Mitchell · 2008
The interaction between two cognitive radio systems with diverse transmission ranges using different strategies is investigated in this paper. The long range system uses a power efficiency (PE) based resource assignment that allows users to use many channels with a low modulation scheme. The short range system employs a bandwidth efficiency based scheme operating with a high modulation scheme and the smallest number of channels. Both systems share a set of OFDM channels based on a power path gain ratio (PPGR) strategy, which provides a novel and direct measurement of the impact on victim receivers from a new transmitter activation and balances it with the benefit to the transmitting system. It is shown that both schemes interact well based on the PPGR strategy. (5 pages)