Performance Analysis of Multichannel Slotted Aloha Networks with Capture

Conclusion

In this chapter, we have analyzed the performance of the multichannel packet radio system with capture where the slotted ALOHA protocol was used to transmit packets on the channel. The performance measures have been calculated under both IFT and DFT protocols. Numerical results showed that channel utilization, packet delay and other important performance measures can be improved by employing capture.

In a multichannel system having fixed total bandwidth, depending on parameter u and channel number M, the improved system performance such as the channel utilization and average packet delay has been obtained. We have seen the quantitative capture restriction u is a very important parameter and increasing u can improve the performance of the system. There are several practical ways to increase the capture restriction parameter u. Considering a simple way, we use the relation and let For fixed and we need let the capture ratio of FM receivers of the system and for fixed we need let

We can also calculate the coefficients of variation of the packet delay and the packet interdeparture time of this capture system by using the analysis of probabilities of successful transmission given in this chapter and the analysis in Chapter 2.