Abstract
Due to the development of 5G networks, wireless data traffic is accelerating at an unprecedented rate. To increase a cellular network’s spectral efficiency (SE), the fundamental approach is handling the power allocation (PA). First, we proposed a SE-optimal self-optimizing water-filling (SOWF) power allocation method that considers each user’s channel signal-to-interference-plus-noise ratio (SINR) while determining the power allocation scheme for all OFDMA subchannels of each user. A near-optimal forward-looking water-filling (FLWF) method was then devised to decrease computing complexity. The proposed algorithm enhanced the SE for sFFR and SFR situations compared to the simultaneous water-filling (SWF), and the integer frequency reuse (IFR) approaches. We eventually validate that the proposed algorithms surpass conventional techniques in diverse conditions with Monte-Carlo simulations. The numerical results indicate that the SOWF + IFR3 achieves the maximum SE, which is 53% higher than the conventional IFR1 + IFR3 and 29% higher than the traditional SWF in the sFFR scenario. In addition, by implementing the proposed SOWF + IFR3 algorithm in the SFR scenario, the network SE is comparable to that of the FLWF + IFR3 and SWF + IFR3 algorithms in the sFFR situation.
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