Study on adaptive data rate scheme on a mobile channel

移动数据业务对传输速率的要求越来越高。扩大无线电波段在法律上是不容易被允许的。多值调制降低了通信质量，尽管减少了用户信道数量，但仍采用多码方案。在本研究中，自适应数据速率方案研究了用户对数据速率和内容的评估随时间和信道的变化。该方案以W-CDMA方案为基础。系统采用软件定义无线电（SDR）技术设计，自适应控制数据速率。在2GHz的5MHz无线电带宽下，数据速率分别为64、128、256、512 kbit/s和1.024 Mbit/s。通过计算机仿真和硬件样机设计，验证了该系统具有良好的控制性能和易于控制的特点。

Enhancement of transmission data rate is rapid in demand on mobile data service. Expanding of radio band is not easily permitted in law. Multi-value modulation degrades the quality of communication, and multi-code scheme is used in spite of reduction of number of user channels.In this study, adaptive data rate scheme is studied time and channel dependent valuation of data rate and contents by users.The W-CDMA Scheme is taken as the basis of this scheme. The system is assumed to be design by Software Defined Radio (SDR) technology for adaptive control data rate. The data rates of 64, 128, 256, 512 kbit/s and 1.024 Mbit/s are taken for 5MHz radio bandwidth at 2GHz. Sufficient characteristic with easy control was confirmed practically with computer simulation and prototype hardware designed with are Field Program Gate Array (FPGA) with a MPU and PC.