论文标题
正交时间频率空间调制的低复杂性迭代耙检测器
Low Complexity Iterative Rake Detector for Orthogonal Time Frequency Space Modulation
论文作者
论文摘要
本文介绍了最近提出的正交时间频率空间（OTFS）调制方案的线性复杂性迭代镜头检测器。基本思想是使用线性多样性（如最大比率组合（MRC）组合（MRC），相等的增益组合和选择组合以改善组合信号的SNR，提取和结合了传输符号的接收多径成分。我们通过在延迟多普勒网格中放置一些无空符号，从而利用通道矩阵的块循环属性，从而重新重新重新将矢量输入输出关系重新出现。使用新的输入输出关系，我们根据MRC方案提出了低复杂性迭代探测器。将提出的检测器的位错误率（BER）性能与采用单个TAP最小均方根误差（MMSE）均衡器的最新消息传递检测器和正交频施加多路复用（OFDM）方案进行比较。我们还表明，通过采用以涡轮决策反馈均衡器（DFE）形式运行的错误代码，可以通过使用错误校正代码来提高MRC检测器的帧错误率（FER）性能。
This paper presents a linear complexity iterative rake detector for the recently proposed orthogonal time frequency space (OTFS) modulation scheme. The basic idea is to extract and combine the received multipath components of the transmitted symbols in the delay-Doppler grid using linear diversity combining schemes like maximal ratio combining (MRC), equal gain combining and selection combining to improve the SNR of the combined signal. We reformulate the OTFS input-output relation in the vector form by placing some null symbols in the delay-Doppler grid thereby exploiting the block circulant property of the channel matrix. Using the new input-output relation we propose a low complexity iterative detector based on the MRC scheme. The bit error rate (BER) performance of the proposed detector will be compared with the state of the art message passing detector and orthogonal frequency division multiplexing (OFDM) scheme employing a single tap minimum mean square error (MMSE) equalizer. We also show that the frame error rate (FER) performance of the MRC detector can be improved by employing error correcting codes operating in the form of a turbo decision feedback equalizer (DFE).
