Energy and spectral efficiencies trade-off with filter optimisation in multiple access interference-aware networks

In this contribution, the optimized deployment of both spectrum and energy resources scarcely available in the mobile multiple access systems has been analyzed, with special attention to the impact of the filter design on the energy efficiency (EE) of code division multiple access (CDMA) networks. Putting into perspective two conflicting metrics, namely throughput maximization and power consumption minimization, the distributed EE utility function is formulated. We also show that the best energy efficiency versus spectral efficiency (SE) tradeoff is achievable when each node allocates exactly the power necessary to attain the maximum EE. In order to demonstrate the validity of our analysis, a low-complexity energy-spectral-efficient algorithm based on distributed instantaneous signal-to-interference-plus-noise ratio (SINR) level is developed, and the impact of single and multiuser detection filters on the EE-SE tradeoff is extensively analyzed by numerical simulation. Copyright c © 2013 John Wiley & Sons, Ltd.