用于5G系统的使用梅花形/交错时频格的高效离线波形设计
Efficient Offline Waveform Design Using Quincunx/Hexagonal Time-Frequency Lattices For 5G Systems
摘要：
LTE-A系统中采用的传统OFDM不能提供5G系统中寻求的服务质量要求，这是因为由5G带来的由更高的多普勒扩展引起的极端自然信道损伤和由多源传输引起的意外人工损伤，以及在一些5G应用中用于闭环信令开销减少的同步松弛。这些严重的损伤引起子载波和OFDM符号之间的正交性的强烈损失，并且因此导致ICI和ISI的急剧增加。为了很好地武装对这些戏剧性的损害，我们，在本文中，优化FBMC系统的发送/接收波形，六边形的时间-频率晶格，在严重的双色散信道，占自然和人工损伤。为此，我们利用的POPS范例，最近提出的矩形时频网格，设计离线波形最大化的SINR六边形时频网格。我们发现，FBMC，六边形晶格，提供了一个强大的改善SIR相对于传统的OFDM和1dB的改善相对于POPS-FBMC，与经典的矩形晶格。此外，我们表明，六边形的POPS-FBMC带来了更强大的频率同步误差，并提供了一个10 dB的减少OOB排放相对于矩形POPS-FBMC。
英文摘要：
Conventional OFDM, adopted in LTE-A systems, cannot provide the quality of service requirements sought in 5G systems because of extreme natural channel impairments caused by higher Doppler spreads and unexpected artificial impairments caused by multi-source transmission, to be brought by 5G, and by synchronization relaxation for closed-loop signaling overhead reduction in some 5G applications. These severe impairments induce a strong loss of orthogonality between subcarriers and OFDM symbols and, therefore, lead to a dramatic increase in ICI and ISI. To be well armed against these dramatic impairments, we, in the present paper, optimize the transmit/receive waveforms for FBMC systems, with hexagonal time-frequency lattices, operating over severe doubly dispersive channels, accounting for both natural and artificial impairments. For this, we exploit the POPS paradigm, recently proposed for rectangular time-frequency lattices, to design offline waveforms maximizing the SINR for hexagonal time-frequency lattices. We show that FBMC, with hexagonal lattices, offers a strong improvement in SIR with respect to conventional OFDM and an improvement of 1dB with respect to POPS-FBMC, with classical rectangular lattices. Furthermore, we show that the hexagonal POPS-FBMC brings more robustness to frequency synchronization errors and offers a 10dB reduction in OOB emissions with respect to rectangular POPS-FBMC.
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。
