4 research outputs found
Maximising the system spectral efficiency in a decentralised 2-link wireless network
<p>Abstract</p> <p>This paper analyses the system spectral efficiency of a 2-link wireless network. The analysis reveals that there exist three operating points that possibly maximise the system spectral efficiency: either both links transmit with maximum power simultaneously or one single link transmits with maximum power while the other is silent. The impact of the chosen multiple access scheme on the system spectral efficiency is also studied: simultaneous transmission or sequential access where the two links share the medium by dedicated time/frequency slots without causing interference. An exhaustive numerical search over a wide range of channel realisations quantifies the gains in system spectral efficiency when choosing either the optimal, single, simultaneous, or sequential medium access. Furthermore, issues regarding the power efficiency are addressed. Finally, the restriction to a 2-link network is relaxed by introducing background interferers, reflecting a multiple link scenario with one dominant interferer. Simulation results indicate that increasing background interference reduces the advantage of sequential over simultaneous transmission.</p
Fundamental Limits of Energy-Efficient Resource Sharing, Power Control and Discontinuous Transmission
The achievable gains via power-optimal scheduling are investigated. Under the
QoS constraint of a guaranteed link rate, the overall power consumed by a
cellular BS is minimized. Available alternatives for the minimization of
transmit power consumption are presented. The transmit power is derived for the
two-user downlink situation. The analysis is extended to incorporate a BS power
model (which maps transmit power to supply power consumption) and the use of
DTX in a BS. Overall potential gains are evaluated by comparison of a
conventional SOTA BS with one that employs DTX exclusively, a power control
scheme and an optimal combined DTX and power control scheme. Fundamental limits
of the achievable savings are found to be at 5.5 dB under low load and 2 dB
under high load when comparing the SOTA consumption with optimal allocation
under the chosen power model.Comment: 12 pages, ISBN 978-1-4577-0928-9. In Future Network & Mobile Summit
(FutureNetw), 201