BER performance for QPSK over additive white Gaussian noise channel is estimated...

MODBUS规约具体内容请参照规约文本。-MODBUS Statute of the specific content of the text please refer to the Statute.

CDMA DATA TERMINAL DTM-500A/H/L Reference Manual

Invariant Wideband Spectrum Sensing Under Unknown Variances

目前的智能机在硬件上多采用双cpu的架构，一个是基带处理器，主要处理数字信号、语音信号的编码解码以及GSM通信协议，另一个是应用处理器，运行操作系统和各种应用程序。基带处理器、射频和其它外围芯片作为一个模块，成为GSM/GPRS modem，提供AT命令接口。网络的应用已经是一个需求的热点，而目前的GSM模块大多都能支持GPRS功能。应用处理器通过AT命令集与带GPRS功能的无线通讯模块通信，为实现网络的应用提供了一个最底层的支持。 -Intelligent machines in the current hardware on many dual-cpu architecture of a baseband processor are mainly deal with digital signals, voice signals, and GSM codecs communication protocol, and the other is the application processor, operating system and applications running procedures. Baseband processor, radio frequency and other peripheral chips, as a module, as a GSM/GPRS modem, provided by AT command interface. Application of network needs is a hot spot, and most of the current GSM module can support GPRS function. Application processor through the AT command set and functionality with GPRS wireless communication module, in order to achieve the application of the network provides a bottom support.

SYMPCHUNK sets the number of symbols demodulated at once with a constant carrier frequency and symbol timing offset. This is a fundamental decoder parameter that establishes its carrier and symbol timing tracking bandwidth. Set it too low and the demodulator can"t accurately determine carrier frequency and symbol timing on a noisy signal. Set it too high and the demodulator may not be able to track large symbol rate offsets caused by Doppler shift and/or A/D or spacecraft clock errors. Or it might have trouble tracking high rates of change in the carrier frequency due to Doppler acceleration.The current value of SYMPCHUNK is 4*N1 = 512, where N1 = 128 is the order of the convolutional interleaver. 512 symbols is 512 milliseconds at 1000 symbols/sec, giving a frequency/time determination SNR that is 10*log10(512) = 27 dB greater than the Es/N0, not counti

GPS中频信号频率和ca码搜索程序，原始数据可以在北京东方联星网站上下载-GPS IF signal frequency and ca code search procedures, raw data can be in Beijing Oriental Lianxing website

展示了如何使用QSerialPort通过USB端口发送和接收数据，该程序用Qt C ++做的。实现异步数据接收和错误处理事件。

新个GSM模块收发手机短信源程序,非常值得借去借鉴。-The new module of GSM mobile phones to send and receive message source, very worthwhile to learn by.

很详细的介绍sip的文章，可以作为通信变成的参考，值得学习。-Sip a very detailed introduction of the article, can be used as communication becomes a reference, it is worth learning.

这是一个关于富士智能系统公司测试门禁的源程序代码-this is a about fujica door test!