A study of packet mobile communication system using code division multiple access

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In this study, we have examine the packet radio communication system using code division multiple access aiming for the purpose of developing the highly efficient and convenient that is suitable for mobile radio communication systems. The obtained results are listed as the following.(1) We have analyzed the throughput and delay performance for CDMA Unslotted ALOHA system.(2) We have obtained the throughput and delay performance for CDMA Unslotted ALOHA system in consideration of packet re-transmission.(3) We have proposed and analyzed the OACP,which controls both packet transmission and packet re-transmission.(4) We have examined the effect of the access timing delay on CDMA ALOHA with CLSP.(5) We have proposed and analyzed the new protocol, that can mitigate the effect of the access timing delay. It has been shown that our proposed protocol, called MCLSP,is robust to the access timing delay. Therefore, it is suitable for satellite system where the system often suffers from a long access timing delay.(6) We have analyzed the throughput of CDMA ALOHA in cellular mobile environment.The above study results have published in the various papers and have presented in international conferences, where they have been accepted as a talented and valuable study.