Filter Bank Based Multi-Carrier Systems for Future Broadband Wireless Communications

用于未来宽带无线通信的基于滤波器组的多载波系统

• 批准号: EP/J017655/1
• 负责人: Pei Xiao
• 金额: $ 12.69万
• 依托单位: University of Surrey
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2012
• 资助国家: 英国
• 起止时间: 2012 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FJ017655%2F1
• 关键词: Filter; Bank; Based; Multi; Carrier

Orthogonal Frequency Division Multiplexing (OFDM) technique has gained increasing popularity in bothwired and wireless communication systems, mainly due to its immunity to multipath fading, which allows for a significantincrease in the transmission rate. By inserting a cyclic prefix (CP) before each transmitted block longer than the lengthof the channel, OFDM effectively transforms a frequency selective channel into a parallel of flat-fading channels. Thisgreatly simplifies both channel estimation and data recovery at receiver. However, these advantages come at the cost of aloss of 10-25% spectral efficiency due to the insertion of CP, and an increased sensitivity to frequency offset and Dopplerspread as well as transmission nonlinearity accentuated by non-constant modulus of OFDM signals. Additionally, dueto the time-varying nature of wireless channels, training sequence needs to be transmitted periodically for the purpose ofchannel estimation. The overhead imposed by training sequence and CP can be up to 50 percent for fast fading channels,causing significant loss of spectral efficiency.In this proposal we aim to tackle these problems with the filter bank based multi-carrier system employing a specialpulse shaping filter called IOTA (isotropic orthogonal transform algorithm) to yield good time and frequency localizationproperties so that inter-symbol interference (ISI) and inter-carrier interference (ICI) are avoided without the use of CP.We also investigate a linearly precoded IOTA system which facilitates blind channel estimation, resulting in a spectrallyefficient multi-carrier system without the transmission of training sequence in addition to the elimination of CP.In order to effectively combat carrier frequency offset and high PAPR problems in the current orthogonal frequency divisionmultiple access (OFDMA) and single carrier frequency division multiple access (SC-FDMA) based uplink communications,we propose a novel multiple access scheme which combines IOTA with low density signature (LDS) technique.The focus of our work will be on the study and utilization of some special properties of IOTA which have been overlookedby others. We aim to leverage these properties in the equalization, decoding and channel estimation design in order toachieve optimal performance and maximum capacity with affordable computational complexity. Our goal is to providetheoretical references and guidelines for successful implementation of IOTA systems for future wireless communications.

正交频分复用（OFDM）技术在有线和无线通信系统中越来越受欢迎，主要是因为它具有抗多径衰落的能力，可以显着提高传输速率。通过在每个传输块之前插入比信道长度长的循环前缀 (CP)，OFDM 有效地将频率选择性信道转换为并行的平坦衰落信道。这极大地简化了接收器处的信道估计和数据恢复。然而，这些优势的代价是由于 CP 的插入而造成 10-25% 的频谱效率损失，以及对频率偏移和多普勒扩频的敏感性增加，以及 OFDM 信号的非恒定模量加剧的传输非线性。另外，由于无线信道的时变特性，需要周期性地发送训练序列以用于信道估计。对于快速衰落信道，训练序列和 CP 带来的开销可能高达 50%，从而导致频谱效率的显着损失。在本提案中，我们的目标是通过基于滤波器组的多载波系统来解决这些问题，该系统采用称为IOTA（各向同性正交变换算法）可产生良好的时间和频率定位特性，从而在不使用 CP 的情况下避免符号间干扰 (ISI) 和载波间干扰 (ICI)。我们还研究了线性预编码IOTA系统有利于盲信道估计，除了消除CP之外，无需传输训练序列即可获得频谱高效的多载波系统。为了有效对抗当前正交频分多址中的载波频率偏移和高PAPR问题基于上行链路通信（OFDMA）和单载波频分多址（SC-FDMA），我们提出了一种将IOTA与低密度签名（LDS）技术相结合的新型多址方案。我们工作的重点将是研究和利用IOTA 的一些被其他人忽视的特殊属性。我们的目标是在均衡、解码和信道估计设计中利用这些特性，以便以可承受的计算复杂性实现最佳性能和最大容量。我们的目标是为未来无线通信IOTA系统的成功实施提供理论参考和指导。

项目成果

Radio Resource Allocation for Uplink OFDMA Systems With Finite Symbol Alphabet Inputs

• DOI: 10.1109/tvt.2013.2287809
• 发表时间: 2014-05
• 期刊: IEEE Transactions on Vehicular Technology
• 影响因子: 6.8
• 作者: Mohammed Al-Imari;P. Xiao;M. Imran;R. Tafazolli

Low complexity subcarrier and power allocation algorithm for uplink OFDMA systems

• DOI: 10.1186/1687-1499-2013-98
• 发表时间: 2013-04
• 期刊: EURASIP Journal on Wireless Communications and Networking
• 影响因子: 2.6
• 作者: Mohammed Al-Imari;P. Xiao;M. Imran;R. Tafazolli

Design of isotropic orthogonal transform algorithm-based multicarrier systems with blind channel estimation

• DOI: 10.1049/iet-com.2012.0029
• 发表时间: 2012-11
• 期刊: IET Commun.
• 作者: Jinfeng Du;P. Xiao;Jinsong Wu;Qingchun Chen

Spatial Modulated Multicarrier Sparse Code-Division Multiple Access

• DOI: 10.1109/twc.2019.2947042
• 发表时间: 2020-01
• 期刊: IEEE Transactions on Wireless Communications
• 影响因子: 10.4
• 作者: Yusha Liu;Lie-liang Yang;P. Xiao;H. Haas;L. Hanzo

A Tight Upper Bound for Enhanced DCT-OFDM With Index Modulation

• DOI: 10.1109/tvt.2020.3035183
• 发表时间: 2020-12-01
• 期刊: IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
• 影响因子: 6.8
• 作者: Cao, Aijun;Xiao, Lixia;Tafazolli, Rahim
• 通讯作者: Tafazolli, Rahim