Throughput performance for Slotted ALOHA DS/CDMA (S-ALOHA-DS/CDMA) and Multicarrier Slotted ALOHA (MC-S-ALOHA) systems is performed and compared in this paper.

A new kind of multiple access channel which is called acknowledgment-type random access and code division multiple access channel(ACK-ALOHA-CDMA)is proposed,which is suitable for inner channel of VSAT satellite communication.

A new kind of multiple access channel which is called acknowledgment-type random access and code division multiple access channel(ACK-ALOHA-CDMA)is proposed in this paper.

This paper discusses the realization of DS CDMA spreading sequences using chaos.

Analysis of stability of slotted ALOHA system;

With the help of BDE algorithm,we then selected optimal slot number in slotted ALOHA protocol.

Then we describe the slotted ALOHA access procedure of the RACH access process and,on this basis,we lay special stress on analyzing the method and detailed procedure of RACH mathematical modeling and give the calculation formula for its throughput.

The reason why both time slot ALOHA algorithm and binary tree one can be used in anti-collision algorithm for RFID system was analyzed.

In order to improve the identification efficiency of tag anti-collision algorithm in RFID system further,analyzing the performance of framed slotted ALOHA anti-collision algorithm,the improved framed slotted ALOHA algorithm is proposed with accurate tag estimation and binary search.