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首页> 外文期刊>Signal Processing, IET >Digital constant-envelope modulation scheme for radar using multicarrier OFDM signals
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Digital constant-envelope modulation scheme for radar using multicarrier OFDM signals

机译:使用多载波OFDM信号的雷达数字恒定包络调制方案

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摘要

Multicarrier signals using orthogonal frequency division multiplexing (OFDM) bring many advantages to radar such as low probability of intercept, improved target detection performance, optimisation of both radar transmitter and receiver etc. A major drawback of multicarrier OFDM signals is their high peak-to-mean envelope power ratio, which reduces the working efficiency of the used power amplifiers. To solve this problem, a digital constant-envelope modulation scheme is proposed for radar using multicarrier OFDM signals. The scheme can transmit multicarrier OFDM signals through power amplifiers being operated near saturation levels (and thus maximising power efficiency) with little spectral distortion, even in the presence of channel mismatch. Given the speed limitations of field programmable gate arrays (FPGAs), the proposed scheme is implemented in an FPGA at intermediate frequency level using a polyphase processing structure.
机译:使用正交频分复用(OFDM)的多载波信号为雷达带来许多优势,例如拦截概率低,目标检测性能提高,雷达发射器和接收器均得到优化等。多载波OFDM信号的主要缺点是其峰峰值较大。平均包络功率比,这会降低所用功率放大器的工作效率。为了解决这个问题,提出了一种使用多载波OFDM信号的雷达数字恒定包络调制方案。该方案即使在存在信道失配的情况下,也可以通过功率放大器传输多载波OFDM信号,该功率放大器在饱和水平附近工作(从而使功率效率最大化),频谱失真很小。考虑到现场可编程门阵列(FPGA)的速度限制,提出的方案是使用多相处理结构在FPGA中频水平上实现的。

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