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（Orthogonal Frequency Division Multiplexing，OFDM）技术由于其抗多径衰落的特性，使得传输速率得到了显著的提高，在有线和无线通信系统中得到了越来越广泛的应用。通过在每个传输块前插入一个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化为平行的平坦衰落信道。这大大简化了接收端的信道估计和数据恢复。然而，这些优点的代价是由于CP的插入而损失10-25%的频谱效率，以及对频率偏移和多普勒扩展的增加的灵敏度，以及由OFDM信号的非恒定模量而加剧的传输非线性。此外，由于无线信道的时变特性，需要周期性地发送训练序列以进行信道估计。在快衰落信道下，训练序列和CP的开销可高达50%，在这个建议中，我们的目标是解决这些问题的滤波器组为基础的多载波系统采用一个特殊的脉冲整形滤波器称为IOTA（各向同性正交变换算法），以产生良好的时间和频率定位特性，从而消除符号间干扰（ISI）和符号间干扰（ISI）。载波干扰（ICI）的避免而不使用CP。我们还研究了线性预编码IOTA系统，这有助于盲信道估计，为了有效地克服当前正交频分多址（OFDMA）和单载波频分多址接入（SC-FDMA）的上行链路通信系统中，提出了一种新的多址接入方案，该方案将IOTA与低密度签名（LDS）技术相结合，重点研究和利用IOTA的一些特殊性质。我们的目标是利用这些属性的均衡，解码和信道估计的设计，以实现最佳的性能和最大容量与负担得起的计算复杂度。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

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

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