Efficient architectures for wireless communications

多载波（MC）调制存在于无线通信系统的几个标准中（例如802.11、802.16），并且正在考虑用于未来的宽带移动系统。在本提案中，我们将研究MC调制和低密度奇偶校验（LDPC）码的组合，特别是从高效VLSI实现的角度。LDPC码已被纳入或正在考虑纳入若干无线通信标准。针对各种传输条件正在提出新的编码。提出的研究目标是继续我们对高度并行结构的研究，并研究如何将这些结构与MC调制有效地结合起来。特别令人感兴趣的是对峰值与平均功率比（PAPR）、自适应调制以及可变速率和速率兼容码的考虑。为了实现这些目标，我们将为LDPC代码开发新的架构，适合于高效实现（例如使用少量资源和快速），并能够实现未来宽带接入系统的数据速率目标（即100 Mbps到Gbps，取决于移动性）。同时，我们还将搜索能够提供良好的性能复杂性权衡的新LDPC代码。我们将进行广泛的分析研究和计算机模拟。我们的一些模拟将使用“硬件在环”技术来完成，以减少模拟时间并考虑实现问题。例如，现场可编程门阵列（FPGA）电路在我们的实验室可用，将被广泛使用。该项目将为加拿大工业界提供有用的成果，帮助加拿大成为定义未来无线系统的主要参与者。宽带无线系统将在未来几年普及，培养该领域的高素质人才非常重要。

Multicarrier (MC) modulation is present in several standards for wireless communications systems (e.g. 802.11, 802.16) and is being considered for future wideband mobile systems. In this proposal, we will study the combination of MC modulation and low density parity check (LDPC) codes, particularly from an efficient VLSI implementation point of view. LDPC codes have been incorporated or are being considered for incorporation in several wireless communications standards. New codes are being proposed for various transmission conditions. The objectives of the proposed research are to continue our investigation on highly parallel structures and study how these can be combined efficiently with MC modulations. Of particular interest are the considerations of peak-to-average-power-ratio (PAPR), adaptive modulation and variable-rate and rate-compatible codes. To achieve these objectives, we will develop new architectures for LDPC codes, suitable for efficient implementations (e.g. using a small amount of resources and being fast) and able to achieve the data rate goals of future wideband access systems (i.e. 100's of Mbps to Gbps, depending on mobility). In parallel, we will also search for new LDPC codes that can offer good performance-complexity trade-offs. We will conduct extensive analytical studies and computer simulations. Some of our simulations will be done using "hardware-in-the-loop" techniques in order to diminish simulation time and consider implementation issues. For example, field programmable gate arrays (FPGA) circuits available in our laboratory, will be extensively used. This project will provide useful results that can be transferred to Canadian industry, helping Canada to be a major player in defining future wireless systems. Wideband wireless systems will be prevalent in the coming years and it is very important to train highly qualified personnel in this area.