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首页> 外文期刊>Aerospace and Electronic Systems, IEEE Transactions on >Time-Multiplexed Offset-Carrier QPSK for GNSS
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Time-Multiplexed Offset-Carrier QPSK for GNSS

机译：GNSS的时分多路偏移载波QPSK

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摘要

A new method of time-multiplexing quadrature phase shift keying (QPSK) signals modulated by a complex subcarrier is proposed. In its simplest form the proposed time-multiplexed off-set carrier quadrature phase shift keying (TMOC-QPSK) can replace the constant-envelope alternate binary offset carrier (AltBOC) currently used for some Global Navigation Satellite System (GNSS) signals. The signal structure is described focusing on the signal generation methodology, power spectral density (PSD), and correlation function in comparison with the alternate binary offset carrier (AltBOC) modulation first used for the Galileo E5 signal. It is shown that the PSD and correlation functions match exactly to those of an AltBOC modulated signal. A method to realize the correlator for the proposed TMOC-QPSK signal is described, and the complexities compared with AltBOC are presented. A field-programmable gate array (FPGA)-based implementation shows that the core TMOC-QPSK correlator requires 32% less hardware resources and consumes 23% less power compared with an AltBOC correlator.
机译：提出了一种复杂的子载波调制的时相正交相移键控（QPSK）信号的新方法。所提出的时分复用偏移载波正交相移键控（TMOC-QPSK）以其最简单的形式可以替代当前用于某些全球导航卫星系统（GNSS）信号的恒定包络替代二进制偏移载波（AltBOC）。与最初用于伽利略E5信号的备用二进制偏移载波（AltBOC）调制相比，重点介绍了信号生成方法，功率谱密度（PSD）和相关函数来描述信号结构。结果表明，PSD和相关函数与AltBOC调制信号完全匹配。描述了一种实现所提出的TMOC-QPSK信号相关器的方法，并提出了与AltBOC相比的复杂度。基于现场可编程门阵列（FPGA）的实现表明，与AltBOC相关器相比，核心TMOC-QPSK相关器所需的硬件资源减少了32％，功耗降低了23％。

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