Using low Earth orbit satellite system and DS-CDMA scheme for mobile voice and data communication

Proceedings of the IEEE SoutheastCon 2000. 'Preparing for The New Millennium' (Cat. No.00CH37105) Pub Date : 2000-04-07 DOI:10.1109/SECON.2000.845405

A. Alsamman, H. Stern

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Abstract

We propose a low Earth orbiting (LEO) satellite system that implements a direct sequence code division multiple access (DS-CDMA) scheme to provide increased coverage and greater system capacity. All system design aspects are described, including system antennas, modulation, frequency allocation, satellite network altitude, and data/voice transmission speeds. This is then followed by capacity calculations and link budget analysis. The capacity and performance analysis of the proposed system shows that it is capable of providing high quality links with BER of 10/sup -4/ at a maximum capacity that exceeds three times the processing gain achievable by the spreading codes. The budget links analysis shows that a transmitted signal power of -3.936 dB is required by the mobile transmitter to maintain an uplink energy to interference ratio E/sub b//I/sub 0/=25.34 dB while a required satellite EIRP of only 10.75 dB is needed to maintain a downlink energy to interference ratio E/sub b//I/sub 0/=16.34 dB.

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采用近地轨道卫星系统和DS-CDMA方案进行移动话音和数据通信

我们提出了一种低地球轨道(LEO)卫星系统，该系统实现了直接序列码分多址(DS-CDMA)方案，以提供更大的覆盖范围和更大的系统容量。描述了所有系统设计方面，包括系统天线、调制、频率分配、卫星网络高度和数据/语音传输速度。接下来是容量计算和链路预算分析。容量和性能分析表明，该系统能够提供高质量链路，最大容量为10/sup -4/，最大容量超过扩频码处理增益的三倍。预算链路分析表明，移动发射机维持上行能量干扰比E/sub b//I/sub 0/=25.34 dB所需发射信号功率为-3.936 dB，而维持下行能量干扰比E/sub b//I/sub 0/=16.34 dB所需卫星EIRP仅为10.75 dB。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of the IEEE SoutheastCon 2000. 'Preparing for The New Millennium' (Cat. No.00CH37105)

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