Channel Hopping for Increased Capacity on Combined Cellular Voice and Packet Radio Networks

这个小企业创新研究第一阶段项目调查了信道跳包无线基站的性能和可行性。在美国，一个由蜂窝服务提供商组成的联盟正在建设一个名为蜂窝数字分组数据（CDPD）的全国性移动数据网络。通过使用现有的30khz无线电频率信道，CDPD在现有的蜂窝语音系统上提供移动数据覆盖。为了利用未使用的容量，CDPD在空闲的语音信道之间跳转。目前正在开发的基站扫描可用的频率，并选择预计将在最长时间内保持空闲的空闲信道。这种方法远非最佳，因为它没有解决同信道干扰效应。为了提高跳频数据信道的吞吐量，基站应选择同信道干扰最小的空闲信道。通过这样做，分组无线电系统理论上可以将吞吐量提高五倍。该项目提出了许多技术挑战，包括需要一个12.5 mhz宽的数字接收机，能够在不到10毫秒的时间内获取和处理信道数据。该项目的研究目标是证明在瑞利衰落中吞吐量提高四倍，确定估计精度，确定实现损失的影响，确定多个跳频信道的性能，并研究有效的频谱估计技术。

This Small Business Innovation Research Phase I project investigates the performance and feasibility of a channel-hopping packet radio-base station. 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 exploit unused capacity, CDPD hops between idle voice channels. Base stations currently under development scan the available frequencies and select the idle channel that is expected to remain idle for the maximum length of time. This approach is far from optimal because it does not address co-channel interference effects. To improve throughput of hopping data channels, the base station should select the idle channel with the least co-channel interference. By doing so, a packet radio system can theoretically increase throughput by a factor of five. This project presents many technical challenges, including the need for a 12.5 MHz-wide digital receiver capable of acquiring and processing channel data in less than 10 milliseconds. The research objectives of this project are to demonstrate a factor of four improvement in throughput in Rayleigh fading, determine estimation accuracy, determine the impact of implementation losses, determine the performance of multiple hopping channels, and investigate efficient spectral estimation techniques.