SBIR Phase II: Adaptive Rate Modem for Mobile Cellular Code Division Multiple Access (CDMA)

小行星9423958 这个小型企业创新研究第二阶段项目调查的无线分组无线电网络的自适应数据速率调制解调器的性能和可行性。 在美国，蜂窝服务提供商的联盟正在建立一个全国性的移动的数据网络，称为蜂窝数字分组数据（CDPD）。 通过使用现有的30 kHz无线电频率信道，CDPD在现有的蜂窝话音系统上提供移动的数据覆盖。 为了对抗多径衰落的影响，CDPD在GF（64）上使用（63，47）Reed-Solomon码。 此代码不能纠正在移动的无线电信道上发生的长时间深度衰落期间发生的所有错误。 本文提出的一种新技术使信息数据速率适应于时变信噪比。 过去的研究表明，理论上，这种技术可以将CDPD的吞吐量提高五倍。 本计画的研究目标是建构一个硬体的调制解调器原型，并在瑞利衰落环境下展现四倍的吞吐量提升。 该原型将基于AT T DSP 32 C浮点信号处理器，并将使用HP 11759 C衰落信道模拟器进行测试。 这项研究的主要商业应用是无线多址通信网络，包括蜂窝无线电、移动的卫星和无线局域网。 所提出的研究的主要好处是更经济地使用蜂窝无线电基站和移动的终端，从而为美国消费者提供更实惠的移动的数据服务。

9423958 Jacobsmeyer This Small Business Innovation Research Phase II project investigates the performance and feasibility of an adaptive data rate modem for wireless packet radio networks. In the United States a consortium of cellular service providers is building a nationwide mobile data network called Cellular Digital Packet Data (CDPD). By using existing 30 kHz radio frequency channels, CDPD provides a mobile data overlay on the existing cellular voice system. To combat the effects of multipath fading, CDPD uses a (63,47) Reed-Solomon code over GF(64). This code cannot correct all the errors that occur during the long, deep fades that occur on the mobile radio channel. A new technique, proposed herein, adapts the information data rate to the time-varying signal to noise ratio. Past research has shown that in theory, this technique can improve throughput of CDPD by a factor of five. The research objectives of this project are to construct a hardware prototype modem and demonstrate a factor of four improvement in throughput in Rayleigh fading. The prototype will be based on the AT&T DSP32C floating point signal processor and will be tested using an HP11759C Fading Channel Simulator. The principal commercial applications of this research are wireless multiple access communication networks, including cellular radio, mobile satellite and wireless local area networks. The primary benefit of the proposed research is more economical use of cellular radio base stations and mobile terminals, resulting in more affordable mobile data service for the US consumer.