A DS-CDMA system with both a circuit-switching scheme for voice transmission and a packet-switching scheme for data transmission is effective in multimedia communication required to transmit a variety of media. Although the Slotted-ALOHA system is believed to be an effective packet-switched system from the perspectives of transmission efficiency and interference power, only open loop transmit power control is used because of the difficulty in using closed loop transmit power control in the ALOHA system. In this paper, we analyze the performance of open loop transmit power control that uses a power margin to obtain the quality required even in packet-switched terminals, and propose wireless packet transmission with variable processing gain control as the method to achieve high-speed transmission by more effectively using the free channels. The results of computer simulations showed that the system capacity of circuit-switched terminals is not damaged when an appropriate power margin is set, and the additional effect of the packet-switched terminals is increased. In addition, the proposed system can greatly shorten the average delay time of packet-switched terminals.
|ジャーナル||Electronics and Communications in Japan, Part I: Communications (English translation of Denshi Tsushin Gakkai Ronbunshi)|
|出版ステータス||Published - 2001 7 7|
ASJC Scopus subject areas
- コンピュータ ネットワークおよび通信