Adaptive Rate Modem for Mobile Cellular Code Division Multiple Access Channels

9361690 Jacobsmeyer这个项目是由美国国家科学基金会（NSF）的小企业创新研究（SBIR）计划，旨在为小企业，特别是小型高科技公司，参与NSF的研究提供机会。 SBIR计划的第一阶段作为一个过滤器，以选择有前途的建议，并确定该公司是否可以做高质量的研究。 第二阶段是主要的研究项目。 第三阶段是将NSF资助的研究转化为商业应用和技术创新，并由后续私人风险资本或其他非联邦融资支持。 第一阶段的重点是研究码分多址（CDMA）信道的一种新的自适应技术，它将增加数字蜂窝的容量。 该技术自动地和动态地调整每个用户的数据速率，以适应CDMA信道的瞬时衰落和干扰条件。 研究的目标是建立信道模型，模拟技术，并证明吞吐量和阻塞概率的性能改善。 5倍的吞吐量改进和4倍的阻塞概率减少似乎是可能的。

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.