clclostayionary

The future satellite communication systems are re- quired to support the higher transmission data rate for providing the multimedia services by employing the e铿僣ient modulation method such as multi-level QAM.

对当前通信信号中常用的数字调相信号BPSK、QPSK、1／4一QPSK、8PSK的调制识别问题，提出了一种基于信号差分高阶累积量的识剐算法。该算法分两个层次进行调制识别，首先利用信号的四阶累积量特征对BPSK、QPSK和{1／4一QPSK、8PSK}信号进行识别，然后再利用信号差分的四阶和八阶累积量特征对1/4-QPSK、8PSK信号进行识别。从理论上分析了的该算法的有效性，并通过计算机仿真验证了算法具有良好的性能。(A recognition algorithm based on differential high-order cumulant is proposed for the modulation recognition problems of BPSK, QPSK, 1/4-QPSK and 8PSK, which are commonly used in current communication signals. The algorithm is divided into two levels for modulation recognition. Firstly, BPSK, QPSK and {1/4-QPSK, 8PSK} signals are identified by using the fourth-order cumulant characteristics of signals, and then 1/4-QPSK and 8PSK signals are identified by using the fourth-order cumulant and eighth-order cumulant characteristics of signal difference. The validity of the algorithm is analyzed theoretically, and the good performance of the algorithm is verified by computer simulation.)

802.3af/at标准,POE 供电协议(standard of 802.3af/at)

本文根据移动通信衰落信道的工作机理, 基于加性高斯白噪声信道( AWGNChannel) 、 落信道( RayleighFading Channel) 、莱斯衰落 icianFadingChannel) 的仿真模型, 并利用M 行了衰落信道的误比特率性能的仿真分析。(Based the working mechanism of the mobile communications fading channel, Based on the additive white Gaussian noise channel (AWGNChannel), The down channel (RayleighFading Channel), Rice fading icianFadingChannel) simulation model, and the use of M Line simulation analysis of the the fading channel bit error rate performance.)

光通信领域编码书籍，业界经典！包含信道编码、TURBO均衡、光通信信道容量等章节的内容。(Coding books in the field of optical communication, the industry classic! Includes channel coding, turbo equalization, optical communication channel capacity, and other contents of the chapters.)

说明：  振铃芯片KA2410数据手册(Ringing chip KA2410 Data Sheet)

车载诊断仪，在线OBD，ECU通信协议技术规范，是诊断仪，ECU开发者必备文档 (Car diagnostic online the OBD ECU communication protocol technical specifications, diagnostic ECU developers required documentation)

一种基于信号二阶四阶矩的信噪比估计方法，该文件中包含该方法的文章以及matlab程序。(This estimation method is based on the signal second-order signal-to-noise ratio of the fourth moment. The file contains a paper and a code.)

说明：  主要介绍了8255接口的基础知识及其实例的应用，并借助几个小例子，介绍如何设计和使用8255(It mainly describes 8255 which is a paralel port)

CDMA系统工程手册，有详尽的参数和标准，分一二三三册(CDMA Systems Engineering Handbook, detailed parameters and standards, in 2330 volumes)