Abstract
This paper analyzes performances of the Pulse Interval Modulation (PIM) scheme for impulse radio ultra-wideband (IR-UWB) communication systems. Due to the PIM anisochronous nature, a tap delay line (TDL) coded division multiple access (CDMA) scheme based on strict optical orthogonal codes (SOOC) is proposed. This scheme is suitable for multiuser high-speed data asynchronous transmission applications because the average symbol length is shorter than in Pulse Position Modulation (PPM) schemes and it needs only chip synchronization. The error probability over the additive white Gaussian noise (AWGN) channel is derived in the single- and multi-user environment and compared with other modulation schemes.
Highlights
Trends in modern communication systems place high demands on low power consumption, high-speed transmission, and anti-interference characteristics
The state of art in impulse radio ultra-wideband (IR-UWB) systems is presented by many applicable modulation techniques like Pulse Amplitude Modulation (PAM), Pulse Position Modulation (PPM), Pulse Shape Modulation (PSM), on-off-keying (OOK), and biphase modulation (BPM)
It can be seen that the derived error probability matches simulation results for 4-Pulse Interval Modulation (PIM) and 8-PIM, while for 2-PIM there is a slight difference for large energy per bit (Eb)/N0
Summary
Trends in modern communication systems place high demands on low power consumption, high-speed transmission, and anti-interference characteristics. Because of power and spectral properties of the transmitted IR-UWB pulses, different types of orthogonal pulse shapes are used to provide a higher spectral efficiency [3, 4]. The state of art in IR-UWB systems is presented by many applicable modulation techniques like Pulse Amplitude Modulation (PAM), PPM, Pulse Shape Modulation (PSM), on-off-keying (OOK), and biphase modulation (BPM). PIM was first introduced in [12] for wireless optical communication systems It is interesting because it displays a higher transmission capacity by eliminating unused time chips within each symbol and does not require both chip and symbol synchronization, but only chip synchronization, since each symbol is initiated with a pulse. Different anisochronous and synchronous pulse time modulation (PTM) techniques for optical short-range wireless communications are compared in [13].
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