OFDM-OQAM系统实现方法及抗双选信道特性分析
首发时间:2018-03-13
摘要:OFDM技术在多载波通信技术中占据主导地位,但本身也具有很多缺点,如频谱利用率低、对同步要求严格及对载波频率偏移敏感等问题。本文对OFDM-OQAM技术进行了讨论,其通过将复数域正交条件放宽至实数域,为引入具有良好时频聚焦特性的滤波器创造了条件,从而在不添加CP的前提下具有比OFDM更为优越的特性。首先,在对系统模型进行讨论的基础上,文章对OFDM-OQAM系统中多相网络及频域扩展两种实现方法进行了讨论,然后从频域均衡和计算复杂度等方面对两种方法进行了比较和分析。最后在高白信道和双选信道下对OFDM-OQAM和OFDM两系统的误码率及信号功率谱密度特性进行了仿真,验证了OFDM-OQAM技术在抗频率选择性衰落和改善频谱利用率方面的优势。最后从计算复杂度的角度论述了多相网络方法的优越性。
关键词: OFDM OFDM-OQAM 多相网络 计算复杂度
For information in English, please click here
Implementation of OFDM-OQAM system and performance analysis against doubly selective channel
Abstract:Among many other multicarrier techniques, Orthogonal Frequency Division Multiplex(OFDM) is dominant. But OFDM has some shortcomings such as low spectral density, strict synchronicity requirement and sensitivity to carrier frequency shift. This paper selects Offset Quadrature Amplitude Modulation based Orthogonal Frequency Division Multiplex(OFDM-OQAM) for discussion,which allows the introduction of a well-localized pulse shape by relaxing the orthogonal condition from complex comain to real. And thus, OFDM-OQAM has many advantages over OFDM without adding Cyclic Prefix(CP). First of all, two implementations of polyphase network and frequency spread of OFDM-OQAM system are discussed, and then compared and analyzed in terms of frequency domain equalization and computational complexity. After that, the simulation result of bit error rate and signal power spectral density of OFDM and OFDM-OQAM in some aspects such as improvement of spectral utilization and robustness against frequency selective fading channel are given. And the dominant position of polyphase network is verified in terms of computational complexity.
Keywords: OFDM OFDM-OQAM polyphase network computational complexity
基金:
引用
No.****
动态公开评议
共计0人参与
勘误表
OFDM-OQAM系统实现方法及抗双选信道特性分析
评论
全部评论0/1000