DS Code Selection Criteria of M-ary Code Selected DS-BPAM UWB System

In this paper, an M-ary code selected direct sequence bipolar pulse amplitude modulation (MCSDS-BPAM) ultra wideband system is introduced and the code selection criteria of this system is investigated. The particular DS code sequence used in MCSDS-MPAM scheme is selected by the log₂M/2 bits from the DS code set, which offers the system higher data rate without increasing the system bandwidth or changing the pulse shape compared to other M-ary modulation schemes. The system performance can be varied by the selection of DS code set from the common DS code set without any extra expense. The criteria based on four parameters used to evaluate the system performance under different code sets are given over an ideal AWGN channel and correlation receivers.