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In recent years, the number of portable mobile terminal users is increasing with improvement of the wireless communication environment. In addition, mobile multimedia services also bring the increase of wireless traffic and lack of spectrum resources. As a technique for efficient spectrum use, spectrum sharing receives much attention. It dynamically assigns a spectrum channel from a larger area network such as WiMAX to smaller area networks such as WiFi-based wireless LANs and achieves to increase the total wireless communication capacity of this area. In a case where all providers are cooperative, the spectrum sharing can be realized easily and improve user throughput in average. In another case where providers are not cooperative, some spectrum trading methods based on auction theory had been proposed.

TJA1050中文说明！！！！！！！！！(TJA1050 CHINESE！)

通信系统的SystemView仿真，详细的说明了用SystemView这个软件做系统设计的步骤。(SystemView communication system simulation, a detailed description of the use of the software to do SystemView system design steps.)

信号的统计检测与估计理论---李道本 一本很好的教材。分别对信号的检测和估计做了详细描述(The statistics of the signal detection and estimation theory--- Li Tao, a good textbook. A detailed description of signal detection and estimation)

循环平稳入门讲解，关于循环平稳常用的参数，简单易懂(It is simple and easy to understand the commonly used parameters of circular stationary.)

说明：  关于sd卡在嵌入式应用中的资料，是网友亲自翻译的，适用于初用sd卡的爱好者(On the sd card applications in the embedded information is personally Netizen translation for the beginning of the lovers with sd card)

At the beginning of 2004, the standards for third generation (3G) cellular technology were embodied in 483 Technical Specifications published by the two Partnership Projects: 3GPP and 3GPP2.

TDOA algorithm presentation

带SPI接口的独立以太网接口控制器，支持全双工和半双工模式，高速SPI接口(Independent Ethernet interface controller with SPI interface, support for full-duplex and half-duplex mode, high-speed SPI interface)

如果你第一次使用D12，请先阅读该文档，将会对你的编程有很大帮助。(if you use the PDIUSBD12 first time ,please read this file first.)