A hybrid TDMA/CDMA mobile cellular system using complementary code sets as multiple access codes

P.A. Leppanen, P. Pirinen
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引用次数: 8

Abstract

A method combining TDMA and CDMA in a digital cellular system is presented. This method makes use of complementary code sets. These codes have been selected due to their ideal autocorrelation and noninteracting characteristics. With these code sets orthogonality between users can be maintained even in the fading multipath channel which is a valuable property that cannot be provided with conventional multiple access codes. Bit error rate simulations have been made to test the link level performance of the system. Both AWGN and Rayleigh fading channels have been employed. Simulation results confirmed that complementary code sets are well adapted for use as multiple access codes in a mobile radio environment. Link level simulations pointed out that by using complementary code sets the number of non-interacting users in the Rayleigh fading channel on a single carrier can be increased. One clear advantage compared to the traditional CDMA systems is that power control is not necessary within a cell. Neither are the time synchronization requirements so strict as usual. The Erlang radio capacity was studied. The results indicated that approximately a twofold improvement over TDMA is possible with hybrid techniques.
一种使用互补码集作为多址码的混合TDMA/CDMA移动蜂窝系统
提出了一种在数字蜂窝系统中结合时分多址和码分多址的方法。此方法使用互补代码集。选择这些码是因为它们具有理想的自相关和非相互作用特性。这些码集可以在衰落的多径信道中保持用户间的正交性,这是传统多址码所不能提供的宝贵特性。通过误码率仿真来测试系统的链路级性能。AWGN和瑞利衰落信道都被采用。仿真结果表明,互补码集很好地适应了在移动无线电环境中作为多址码使用。链路级仿真表明,利用互补码集可以增加单载波瑞利衰落信道中非交互用户的数量。与传统的CDMA系统相比,一个明显的优点是不需要在小区内进行功率控制。时间同步要求也不像通常那样严格。研究了二郎机的无线电容量。结果表明,混合技术可能比时分多址(TDMA)提高大约两倍。
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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