Spread spectrum pulse position modulation-a simple approach for Shannon's limit-
Spread spectrum pulse position modulation-a simple approach for Shannon's limit-
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扩频脉冲位置调制——解决香农极限的简单方法——
DOI：
10.1109/iccs.1992.255002
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
T. Hasegawa
中科院分区：
文献类型：
--
作者：
I. Okazaki;T. Hasegawa
本文提出了一种扩频脉冲位置调制（SS PPM）系统，描述了它的基本性能。在许多直接序列扩频（DS-SS）系统中，为了结构简单、成本低廉，每个解调器都要求只使用一个PN匹配滤波器。传统上使用诸如开关键控（SS-OOK）或差分相移键控（SS-DPSK）系统的系统。本文作者提出了扩频脉冲位置调制（SS-PPM）系统作为这样的系统之一，并且表明SS-PPM系统具有以下优点：（1）更高的数据速率（在相同的带宽和相同的码长下，比其他传统的SS系统高约4倍），（2）与其它系统相比具有上级性能的误码率（BER）（SS-PPM系统的BER特性随着SS-PPM系统的码片时隙数的增加而改善，并且接近香农极限）。通过理论分析和计算机仿真，对SS-PPM系统的异步CDMA性能进行了评估。<<ETX>>
A spread spectrum pulse position modulation (SS-PPM) system is proposed and its basic performances are described. In many direct sequence spread spectrum (DS-SS) systems, each demodulator is desired to use an only pseudonoise (PN) matched filter for simple structure and low cost. Such systems as on-off keying (SS-OOK) or differential phase-shift keying (SS-DPSK) systems have been conventionally used. The present authors propose the spread spectrum pulse position modulation (SS-PPM) system as one of such systems, and show that the SS-PPM system has the following advantages: (1) higher data rate (about 4 times higher than the other conventional SS systems under the same bandwidth and the same code length), (2) superior performance of bit error rate (BER) to the other systems (BER characteristics of the SS-PPM system improves with increasing the number of chip slot of the SS-PPM system, and it approaches Shannon's limit). Furthermore they evaluate asynchronous CDMA performance of the SS-PPM system by theory and computer simulation.<<ETX>>