A performance analysis of optical overlapping PPM-CDMA communication systems

A performance analysis of optical overlapping PPM-CDMA communication systems
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光重叠PPM-CDMA通信系统的性能分析

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发表时间：
1999
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通讯作者：
H. Shalaby
H. Shalaby
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文献类型：
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作者：
H. Shalaby

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提出了一种采用重叠脉冲位置调制（OPPM）方案的直接检测光码分多址（CDMA）系统。在考虑多用户干扰和接收机散粒噪声影响的情况下，推导了系统误码率的上限和下限。光电二极管的暗电流被忽略，因为它们的影响很小。该系统的吞吐量限制进行了评估。性能特点，然后比较采用传统的开关键控（OOK）和脉冲位置调制（PPM）方案的光CDMA系统。结果表明，在固定的数据速率和码片时间下，OPPM-CDMA系统优于传统的两种系统。此外，它表明，OPPM-CDMA的吞吐量限制几乎是6.7倍大于OOK-CDMA。
Direct-detection optical code-division multiple-access (CDMA) systems employing overlapping pulse-position modulation (OPPM) schemes are proposed. Both upper and lower hounds on the bit error rate (BER) are derived taking into account the effect of both multiple-user interference and receiver shot noise. The photodiodes' dark currents are neglected since their effect is minor. The throughput limitation of this system is evaluated as well. Performance characteristics are then compared to optical CDMA systems employing traditional ON-OFF keying (OOK) and pulse-position modulation (PPM) schemes. It is shown that under fixed data rate and chip time, OPPM-CDMA system superperforms both traditional systems. Moreover, it is shown that the throughput limitation of OPPM-CDMA is almost 6.7 times greater than that of OOK-CDMA.