arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.05261cs.ITcs.LGeess.SPmath.IT
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OFDM的端到端学习:从神经接收器到无人驾驶通信

End-to-end Learning for OFDM: From Neural Receivers to Pilotless Communication

Nokia Bell Labs(诺基亚贝尔实验室);NVIDIA(英伟达)

Fayçal Ait Aoudia, Jakob Hoydis

摘要:

先前的研究已经证明,端到端学习可以在加性高斯白噪声(AWGN)信道上实现显著的整形增益。然而,它的好处还没有被量化超过现实的无线信道模型。这项工作的目的是填补这一空白,探索使用正交频分复用(OFDM)的频率和时间选择性衰落信道的端到端学习的收益。在接收器处具有不完善的信道知识的情况下,在AWGN信道上观察到的成形增益消失。尽管如此,我们确定了其他两个性能改进的来源。第一个来自基于神经网络(NN)的接收机,该接收机在大量子载波和OFDM符号上运行,可以显着减少正交导频的数量,而不会损失比特出错率(BER)。第二个来自通过联合学习神经接收机连同叠加导频(SIP)、与传统正交幅度调制(QAM)线性组合或优化星座几何形状来完全消除正交导频。所学习的几何结构适用于宽范围的信噪比(SNR)、多普勒和延迟扩展,具有零均值并且因此不包含任何形式的叠加导频。这两种方案都实现了与基于导频的基线相同的BER,吞吐量提高了约7%。因此,我们相信,联合学习的发射机和接收机是超5G通信系统的一个非常有趣的组件,它可以消除对解调参考信号(DMRS)的需求和相关控制开销。

英文摘要:

Previous studies have demonstrated that end-to-end learning enables significant shaping gains over additive white Gaussian noise (AWGN) channels. However, its benefits have not yet been quantified over realistic wireless channel models. This work aims to fill this gap by exploring the gains of end-to-end learning over a frequency- and time-selective fading channel using orthogonal frequency division multiplexing (OFDM). With imperfect channel knowledge at the receiver, the shaping gains observed on AWGN channels vanish. Nonetheless, we identify two other sources of performance improvements. The first comes from a neural network (NN)-based receiver operating over a large number of subcarriers and OFDM symbols which allows to significantly reduce the number of orthogonal pilots without loss of bit error rate (BER). The second comes from entirely eliminating orthognal pilots by jointly learning a neural receiver together with either superimposed pilots (SIPs), linearly combined with conventional quadrature amplitude modulation (QAM), or an optimized constellation geometry. The learned geometry works for a wide range of signal-to-noise ratios (SNRs), Doppler and delay spreads, has zero mean and does hence not contain any form of superimposed pilots. Both schemes achieve the same BER as the pilot-based baseline with around 7% higher throughput. Thus, we believe that a jointly learned transmitter and receiver are a very interesting component for beyond-5G communication systems which could remove the need and associated control overhead for demodulation reference signals (DMRSs).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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