CAREER: A Unifying Signal Processing Framework for Estimating Statistical Channel Quality Measures In Wireless Communications

在无线宽带通信中，通信介质（“信道”）对传输信号造成的失真，需要精确的信道模型来表征和减轻这种失真。这些模型需要考虑发射器和接收器的移动性，通信器之间可能存在的视线，以及噪声和干扰的存在，所有这些都是量化信道质量的参数，并影响通信系统的性能。因此，构建这样的模型，并使用这些模型来估计这些统计渠道质量度量是有意义的。本研究的目标是构建和利用信号处理框架来估计这些信道质量措施，这有望帮助设计具有改进性能的宽带系统。更具体地说，在本研究过程中，PI将构建最优（最大似然和最小方差）以及基于矩的信道质量指标估计器，如最大多普勒扩频、信干扰加噪声比和宽带系统（如OFDM）的Ricean因子。在描述了时间选择和频率选择信道对一般块传输系统的有害影响之后（其中OFDM是一个特例），PI将设计通用OFDM收发器，以减少载波间干扰的不利影响。因此，研究将集中于随机时变信道对宽带系统的不利影响，并提出新颖的、低复杂性的补救措施。

0133841Tepedelenlioglu, CihanArizona State UniversityIn wireless broadband communications, the distortion that the communication medium (`the channel') causes on the transmitted signal, warrants accurate channel models in order to characterize and mitigate the distortion. These models need to take into account the mobility of the transmitter and receiver, the possible presence of a line-of-sight between the communicators, and the presence of noise and interference, all of which are parameters that quantify the channel quality, and affect the performance of the communication system. It is, therefore, of interest to construct such models, and use these models to estimate these statistical channel quality measures. It is the goal of this research to construct and utilize a signal processing framework to estimate these channel quality measures, which is expected to aid in the design of broadband systems with improved performance. More specifically, in the course of this research, the PI will construct optimal (maximum likelihood and minimum variance) as well as moment-based estimators for channel quality indicators such as the maximum Doppler spread, signal to interference plus noise ratio, and the Ricean factor for broadband systems such as OFDM. After characterizing the deleterious effects of the time-selective and frequency-selective channel on general block transmission systems, for which OFDM is a special case, the PI will devise generalized OFDM transceivers that reduce the adverse effects of the inter-carrier interference. Hence, the research will focus on the adverse effects of the randomly time-varying channel on broadband systems and propose novel, low-complexity remedies.