The Interplay Between Data Transmission Power and Transmission Link Utilization

We consider a single-input single-output communications link in which a transmitter and a receiver, both having data buffers with their own unique quality-of-service (QoS) constraints, perform data transmission over a time-selective flat fading wireless channel. Regarding the stochastic nature of the wireless channel in the physical layer, we first provide the effective capacity at the transmitter buffer. Then, we assume a data arrival process with a constant rate to the transmitter buffer and identify the departure process from the transmitter to the receiver. Noting that the departure process is the arrival process at the receiver buffer, we find the effective bandwidth at the receiver buffer. Establishing the maximum transmission link utilization as the ratio between the effective capacity at the transmitter and the effective bandwidth at the receiver, we investigate the relationship between the transmission power in the channel and the maximum transmission link utilization under QoS requirements by employing different symbol modulation techniques in a Rayleigh fading environment.