A new capture model for mobile radio slotted ALOHA systems

It is well known that capture effect can considerably improve system throughput of mobile radio slotted ALOHA networks. Most of the capture models in the literature are based on the signal-to-interference power ratio with the assumption that the captured packet is error-free. In this paper, we proposed a capture model for slotted ALOHA systems employing symbol erasures and error-and-erasure correcting codes. In contrast to the previous models, the model we propose uses a target bit error rate (BER) as the capture measure, which in turn is controlled by a symbol-erasure-threshold. Performance of the proposed model is analyzed taking account of modulation and coding techniques, the signal-to-noise ratio, the user spatial distribution as well as Rayleigh channel fading