SBIR Phase I: Self and Alien Crosstalk Cancellation for Copper-Based Cellular and Access Backhaul

该小型企业创新研究（SBIR）第一阶段项目旨在提高基于铜双绞线的蜂窝和接入回程网络的数据吞吐量，以满足不断增长的容量需求以及随之而来的瓶颈。在多双绞线信道中的性能受到在其噪声环境中由各种源引起的串扰和干扰的限制。在第一阶段项目中开发的技术通过具有成本效益的干扰缓解机制大大提高了吞吐量。公司？的关键创新在于低延迟动态干扰消除算法，该算法在保持可接受的实现复杂度的同时，极大地提高了系统性能。该项目将涉及在算法层面的研究和开发，以及与系统最小化相关的系统实施挑战。的成本和功耗。更具体地，本发明包括训练序列设计的新颖方法和用于减轻自感应串扰以及源自共享双绞线电缆的其他系统的不可预测串扰（外来干扰）的数字鲁棒方案。根据初步结果，预计这一技术将提供急需的吞吐量提高，从2倍到5倍不等，视业务情况而定，这一项目的更广泛影响/商业潜力将是使更多的人口能够获得低成本宽带服务，从而促进远程教育、远程办公和电子商务。在美国，大约80%的手机发射塔使用铜双绞线作为回程线路，由于带宽密集型智能手机和蜂窝互联网产品的部署，2009年设备市场价值为56亿美元，预计到2013年将增长到112亿美元。因此，直接受影响的相关市场部门是芯片和通信设备制造业。许多新的微蜂窝和毫微微蜂窝在比典型蜂窝塔的覆盖区域更小的覆盖区域中提供无线接入，它们正在被部署以提供无线宽带覆盖，同时依赖于基于协作的回程。铜线基础设施通常受到容量限制，并且干扰占主导地位，而更高容量的替代方案，光纤和微波，成本高，部署缓慢。与位于达拉斯的德克萨斯大学合作开发的实现这一突破的干扰减轻技术可以应用于其他多信道通信系统，并且可以用于例如更好地利用稀缺的无线频谱。

This Small Business Innovation Research (SBIR) Phase I project targets increased data throughputs in cellular and access backhaul networks that are based on copper twisted-pairs to address the ever-growing demand for capacity and the consequent bottlenecks that are experienced in them. The performance in the multi-twister-pair channels is limited by crosstalk and interference caused by various sources in their noisy environment. The technology to be developed in this Phase I project offers significant increases in throughput through cost-effective interference-mitigation mechanisms. The company?s key innovation is in low-latency dynamic interference cancellation algorithms, which greatly enhance system performance while maintaining acceptable implementation complexity. The project will involve both research and development at the algorithmic level, as well as system implementation challenges associated with the minimization of the system?s cost and power consumption. More specifically, the innovation includes novel approaches to training-sequence design and numerically-robust schemes for the mitigation of both self-induced crosstalk as well as unpredictable crosstalk originating from other systems sharing the cable of twisted pairs (alien interference). Based on preliminary results, it is anticipated that this technology will offer critically needed throughput enhancements ranging from a factor of 2 to a factor of 5, depending on the operating scenario.The broader impact/commercial potential of this project would be in enabling low-cost broadband services to a greater part of the population and thus also in fostering remote education, telecommuting and e-commerce. About 80% of the cell towers in the US utilize copper twisted-pairs for their backhaul, and the equipment market, valued at $5.6B in 2009, is expected to grow to $11.2B by 2013 due to deployment of bandwidth-intensive smart-phones and cellular Internet offerings. Hence, the relevant market sectors directly impacted are chip and communications equipment manufacturing. Many new micro-cells and femto-cells, offering wireless access in a coverage area smaller than that of a typical cell tower, are being deployed to offer wireless broadband coverage while relying on cooper-based backhaul. The copper infrastructure typically suffers capacity limitations and is interference-dominated while the higher-capacity alternatives, fiber and microwave, are costly and slow to deploy. The interference-mitigation technology enabling this breakthrough, developed in collaboration with the University of Texas at Dallas, may be applicable in other multi-channel communication systems, and can serve, for example, to better utilize scarce wireless spectrum.