对称平衡不完全区组设计的删减PPM
Expurgated PPM Using Symmetric Balanced Incomplete Block Designs
摘要：
在这封信中，我们提出了一种新的脉冲位置调制（PPM）方案，称为清除PPM（EPPM），应用于峰值功率受限的通信系统，如脉冲无线电（IR）超宽带（UWB）系统和自由空间光（FSO）通信。使用该方案，星座的大小和比特率可以显着增加在这些系统中。这些符号使用对称平衡不完全区组设计（BIBD）获得，形成一组成对等距符号。在相同的符号长度下，Q进制EPPM的性能优于任何基于Q进制脉冲位置的调制方案。由于码是循环的，所以EPPM的接收机与多脉冲PPM（MPPM）相比更简单。
英文摘要：
In this letter, we propose a new pulse position modulation (PPM) scheme, called expurgated PPM (EPPM), for application in peak power limited communication systems, such as impulse radio (IR) ultra wide band (UWB) systems and free space optical (FSO) communications. Using the proposed scheme, the constellation size and the bit-rate can be increased significantly in these systems. The symbols are obtained using symmetric balanced incomplete block designs (BIBD), forming a set of pair-wise equidistance symbols. The performance of Q-ary EPPM is better than any Q-ary pulse position-based modulation scheme with the same symbol length. Since the code is cyclic, the receiver for EPPM is simpler compared to multipulse PPM (MPPM).
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