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Coming cellular systems are envisioned to open up to new services withstringent reliability and energy efficiency requirements. In this paper wefocus on the joint power control and rate allocation problem in Single-InputMultiple-Output (SIMO) wireless systems with Rayleigh fading and stringentreliability constraints. We propose an allocation scheme that maximizes theenergy efficiency of the system while making use only of average statistics ofthe signal and interference, and the number of antennas $M$ that are availableat the receiver side. We show the superiority of the Maximum Ratio Combining(MRC) scheme over Selection Combining (SC) in terms of energy efficiency, andprove that the gap between the optimum allocated resources converges to$(M!)^(1/(2M))$ as the reliability constraint becomes more stringent.Meanwhile, in most cases MRC was also shown to be more energy efficient thanSwitch and Stay Combining (SSC) scheme, although this does not hold only whenoperating with extremely large $M$, extremely high/small averagesignal/interference power and/or highly power consuming receiving circuitry.Numerical results show the feasibility of the ultra-reliable operation when $M$increases, while greater the fixed power consumption and/or drain efficiency ofthe transmit amplifier is, the greater the optimum transmit power and rate.

Joint Power Control and Rate Allocation enabling Ultra-Reliability and Energy Efficiency in SIMO Wireless Networks