Wireless Link Dimensioning and Transmission Parameters Optimisation
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چکیده
This paper provides guidelines for Wireless ATM (WATM) link dimensioning and coding parameters optimisation subject to meeting specified Quality of Service (QoS) requirements. It takes into consideration a comprehensive set of coding as well as teletraffic issues: (1) effects of retransmissions of erroneous packets using Automatic Repeat Request (ARQ) protocols, (2) modulation efficiency (3) Forward Error Correction (FEC) redundancies, and (4) effect of traffic burstiness on loss and delay. Simulations are used to derive Bit Error Rate values for a range of modulation efficiency and FEC Code Rate parameters. These parameters are then optimized to obtain maximal efficiency. We discover that adaptive modulation, where modulation efficiency is dynamically optimized, provides significant efficiency gains. In fact, we demonstrate that in many practical situations, optimal adaptive modulation together with or even without ARQ retransmission in the absence of FEC provides better efficiency and/or QoS than the same system with FEC. 2 Link Dimensioning and Transmission Parameters Optimisation
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تاریخ انتشار 2007