CAREER: Linear Precoding Methods for High Bit Rate Wireless Transmission

可以预见，在不久的将来，能够发送和接收各种类型的信息(图像、音频、数据)的独特的移动设备将支持计算和多媒体应用。这些设备将使用基于互联网的独特接口，这是一种基于IP的通用传输协议，并将受到无处不在的无线覆盖的支持。然而，今天使用的通信技术不足以在不产生螺旋式增长的带宽需求的情况下支持这一进步。随着带宽成为低利润商品，需要从物理层开始跨越某些技术壁垒。使用我们称为“线性预编码”的调制范例，该项目研究允许在宽带频率选择性时变信道上进行高比特率分组传输的设计。线性预编码框架中的块传输模型为确定分组传输的最佳或最具成本效益的多址接入技术提供了非常一般的设置。该项目的扩展是开发用于分组传输的物理层解决方案，该解决方案：1)最大限度地减少用于联合训练、纠错编码和预编码的开销带宽；2)适应时变信道；3)可以结合任意数量的发射和接收天线；4)可以支持多接入分组传输，允许在速率、译码延迟和复杂度方面的不同服务质量要求。线性预编码的数学框架不仅是研究的有用工具，也是教学的有用工具，因为它允许统一描述宽带和高比特率传输的原理，包括作为特例的天线分集、扩频和多载波传输等方案。

Scaglione, AnnaCornell U0133635"Linear precoding methods for high bit rate wirelesstransmission over time-varying broadband channels"It is predictable that in the near future computing and multimedia applications will be supported by unique mobile devices that will be capable of transmitting and receiving various type of information (images, audio, data). These devices will use a unique interface based on the Internet, a common transfer protocol basedon IP and will be supported by ubiquitous wireless coverage. However, the communication technology used today is inadequate to support this progress without generating a spiraling demand for bandwidth. As bandwidth becomes a low-margin commodity, certain technological barriers need to be surpassed starting from the physical layer. Using the modulation paradigm that we refer to as "linear precoding" this project researches designs that allow high bit rate packet transmission over broadband frequency selectivetime-varying channels. The block transmission model in the linear precoding framework provides a very general setting to determine the optimal or most cost-effective multiple access technique for packet transmission. The outreach of this project is the development of physical layer solutions for packet transmission that: 1) minimize the overhead bandwidth dedicated to training, error correction coding and precoding jointly; 2) adapt to time-varying channels ; 3) can incorporate an arbitrary number oftransmit and receive antennas; 4) can support multiple access packet transmission, allowing different quality of service requirements in terms of rate, decoding delay and complexity. The mathematical framework of linear precoding is not only an useful tool for research but also for teaching, since it allows a unified description of the principles of wideband and high bit rate transmission, including schemes such as antenna diversity, spread spectrum and multicarrier transmissions as special cases.