Bandwidth Efficient Multi-carrier System for Wireless Channels

无线信道的带宽高效多载波系统

• 批准号: EP/D077362/1
• 负责人: Izzat Darwazeh
• 金额: $ 45.08万
• 依托单位: University College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FD077362%2F1
• 关键词: Bandwidth; Efficient; Multi; carrier; System

The research work proposed here investigates the means to develop a bandwidth efficient communication method, for future wireless systems, based on multicarrier techniques. In the last decade wireless communications have experienced an explosive growth with the demand for higher data rates to accommodate new services. This led to a plethora of standards being adopted and commercialised. In the communications and wireless research communities, substantial effort has been dedicated to develop bandwidth efficient signalling schemes to convey such high data rates in the adverse wireless environment, where transmission performance is severely compromised by frequency selective fading, interference and noise. Wideband code division multiple access (WCDMA) techniques have been adopted for third generation wireless mobile systems in order to accommodate data rates of the order of few Mbits/s and orthogonal frequency division multiplexing (OFDM) techniques have become serious contenders studied for future generation wireless systems. The OFDM schemes are based on the concept of dividing the data into several streams and then sending the streams on separate carriers, where the adjacent carriers have a frequency separation equal to the rate of each of the data streams. At UCL we developed a scheme where such frequency separation can be halved and therefore the bandwidth can be doubled. Such scheme has its limitation in terms of the nature of the data to be transmitted and is very susseptible to channel imperfections. Following that we carried out initial studies on a more efficient scheme of modulation and demodulation where the carrier separation can be further reduced, thereby providing even higher bandwidth efficiency advantages. The feasibility of this proposed scheme has been proven through basic analytical work and detailed modelling/simulation. In this proposal we aim to carry out further studies of our proposed scheme and assess its advantages, disadvantages and its limitations. This work will be carried out through detailed analytical studies and mathematical modelling, as well as, basic implementation using Digital Signal Processing (DSP) techniques.

这里提出的研究工作调查的手段，以开发一个带宽有效的通信方法，为未来的无线系统，基于多载波技术。在过去的十年中，无线通信经历了爆炸性的增长，需要更高的数据速率来适应新的服务。这导致了过多的标准被采用和商业化。在通信和无线研究界，大量的努力致力于开发带宽有效的信令方案，以在不利的无线环境中传送如此高的数据速率，其中传输性能受到频率选择性衰落、干扰和噪声的严重损害。宽带码分多址（WCDMA）技术已经被用于第三代无线移动的系统，以便适应几兆比特/秒量级的数据速率，并且正交频分复用（OFDM）技术已经成为下一代无线系统所研究的重要竞争者。OFDM方案基于将数据划分成若干个流并且然后在单独的载波上发送这些流的概念，其中相邻载波具有等于每个数据流的速率的频率间隔。在UCL，我们开发了一种方案，可以将这种频率分离减半，因此带宽可以加倍。这种方案在要传输的数据的性质方面有其局限性，并且非常容易受到信道缺陷的影响。随后，我们对更有效的调制和解调方案进行了初步研究，其中载波间隔可以进一步减小，从而提供更高的带宽效率优势。通过基本的分析工作和详细的建模/仿真，证明了该方案的可行性。在本提案中，我们的目的是对我们提出的计划进行进一步研究，并评估其优点，缺点和局限性。这项工作将通过详细的分析研究和数学建模以及使用数字信号处理（DSP）技术的基本实施来进行。