Estimation of the time-varying paramets characterizing the wireless channels in cellular systems

表征蜂窝系统中无线信道的时变参数的估计

• 批准号: 312265-2008
• 负责人: Stéphenne, Alex
• 金额: $ 1.09万
• 依托单位: Institut national de la recherche scientifique
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=481201
• 关键词: Estimation; time; varying; paramets; characterizing

My main research objective, is to propose an efficient iterative estimation module for the wireless channel coefficients and associated parameters (SNR, maximum Doppler shift, time and frequency offsets, angular spread, K-factor associated with the line-of-sight (LOS) , LOS Doppler shift,...) in future high data speed cellular networks. I will focus my efforts on wideband systems that use OFDM, even if many of the developed estimation algorithms are expected to be applicable, in addition, to systems for which a narrowband channel assumption is appropriate. While most studies focus on specific parameters while using simplifying assumptions for other parameters, our ultimate goals will be to develop a full estimation module capable of estimating the channel and its parameters under practical conditions. The estimators will therefore have to perform adequately with non-constant envelope modulation and with colored interference scenarios. The developed module will rely on the presence of pilot symbols, and various pilot allocation and signaling strategies will be evaluated, which will need to be tailored to the type of multi-access (OFDMA, TDMA and hybrid versions will be studied), smart antenna (beamforming, spatial multiplexing, etc) and link adaptation strategies. Both time division duplex (TDD) and frequency division duplex (FDD) will be considered, and possible uplink/downlink channel symmetry exploited. Recursive or turbo-like approaches will be studied to obtain a global estimation module of relatively low complexity. Furthermore, since we observe a proliferation of GPS-enabled cellular terminals, I will investigate the possibility of enhancing the channel parameters estimation process by exploiting the possible knowledge (with the appropriate signaling) of the position/speed/trajectory of the various transmitters/receivers. The algorithmic designs will first be based on the link-level performance, but will be fine-tuned based on a multi-user multi-cellular system-level performance evaluations conducted on a simulator that will need to be constructed with appropriate simplifying assumptions. Implementation aspects will also be considered.

我的主要研究目标是提出一种有效的迭代估计无线信道系数及其相关参数(SNR、最大多普勒频移、时间和频率偏移、角度扩展、与视线(LOS)相关的K因子、LOS多普勒频移等)的模型。在未来的高速蜂窝网络中。我将把我的努力集中在使用ofdm的宽带系统上，即使许多已开发的估计算法预计将适用于窄带信道假设适合的系统。虽然大多数研究集中在特定参数上，而对其他参数使用简化的假设，但我们的最终目标是开发一个完整的估计模块，能够在实际条件下估计信道及其参数。因此，估计器必须在非恒定包络调制和有色干扰情况下充分执行。开发的模块将依赖于导频符号的存在，并将评估各种导频分配和信令策略，这些策略将需要根据多路接入类型(将研究OFDMA、TDMA和混合版本)、智能天线(波束成形、空间多路复用等)和链路适配策略而量身定做。将考虑时分双工(TDD)和频分双工(FDD)，并利用可能的上行链路/下行链路信道对称性。将研究递归或类Turbo方法，以获得相对较低复杂度的全局估计模块。此外，由于我们观察到支持GPS的蜂窝终端的激增，我将研究通过利用各种发射器/接收器的位置/速度/轨迹的可能知识(具有适当的信令)来增强信道参数估计过程的可能性。算法设计将首先基于链路级性能，但将基于在仿真器上进行的多用户多蜂窝系统级性能评估进行微调，该仿真器将需要使用适当的简化假设来构建。还将考虑实施方面的问题。