Generalised Link-Layer Optimisation: Application and Performance Evaluation
A wireless communication system work more efficiently if link-layer parameters such as modulation order, symbol rate and packet size are (adaptively) optimised. A common criterion is to maximise spectral efficiency subject to a very low bit-error constraint. But for systems equipped with strong error detection and a selective packet re-transmission mechanism, a packet-oriented criterion is more appropriate. Recently, the authors showed that the link configuration that maximises bits per second or bits per Joule can be identified by drawing a tangent from the origin to the scaled graphs of the corresponding packet-success rate functions: the steeper the tangent the better the configuration.