Adaptive Rate Modem for Mobile Cellular Code Division Multiple Access Channels

本项目由美国国家科学基金会（NSF）小企业创新研究（SBIR）项目资助，旨在为小企业，特别是小型高科技公司提供参与NSF研究的机会。SBIR项目的第一阶段是筛选有前途的提案，并确定公司是否可以进行高质量的研究。第二阶段为主要研究项目。第三阶段是将nsf资助的研究转化为商业应用和技术创新，由后续的私人风险资本或其他非联邦融资支持。第一阶段项目的重点是研究一种新的码分多址（CDMA）信道自适应技术，该技术将增加数字蜂窝容量。该技术根据CDMA信道的瞬时衰落和干扰情况，自动动态地调整每个用户的数据速率。研究目标是建立信道模型，模拟该技术，并演示吞吐量和阻塞概率方面的性能改进。吞吐量提高5倍，阻塞概率降低4倍似乎是可能的。

9361690 Jacobsmeyer This project is funded under the National Science Foundation's (NSF) Small Business Innovation Research (SBIR) program, which is designed to provide an opportunity for small business, particularly the small high technology firm, to participate in NSF research. Phase I of the SBIR program serves as a filter to select promising proposals and determine if the firm can do high quality research. Phase II is the principal research project. Phase III is the conversion of the NSF-funded research into commercial applications and technological innovation supported by follow-on private venture capital or other non-federal financing. The focus of this Phase I project is to investigate a new adaptive technique for code division multiple access (CDMA) channels that will increase digital cellular capacity. The technique automatically and dynamically adjusts each user's data rate to the instantaneous fading and interference conditions of the CDMA channel. The research objectives are to model the channel, simulate the technique, and demonstrate performance improvements in throughput and blocking probability. Throughput improvements of a factor of 5 and reductions in blocking probability of a factor of 4 appear possible.