用TCP编写的chat_server和chat_client，一定要先运行chat_server，再运行chat_client，否则会出错。不必要一方一次说一句...

this code used to illustrate the different problems in delta modulation technique also variable slope delta modulation also the bit error rate versus signal to noise ratio for ook and prk

基于ATmega16单片机设计的串口波特率发送程序。下载方便。-ATmega16-based single-chip serial port baud rate to send the design process. Download easy.

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iFFT的纠错编码，在编码过程中，其中一个重要的编码属于ieee802.16内部bpsk。

Adaptive Filter Theory　是滤波器设计的经典教材，深入浅出的讲解了滤波器的原理-Adaptive Filter Theory is the classic filter design materials, in simple terms to explain the principles of the filter

本讲义详细介绍了ＳＮＭＰ协议的内容，给出了一些报文的具体格式，是不错的学习资料-the overhead of SNMP detail the contents of the agreement, gives some of the specific message format, was a good learning materials

OFDM的详细仿真代码，有信道编码，调制，信道估计等-OFDM detailed simulation codes, channel coding and modulation, channel estimation, etc.

The program can count the number of the girth 4 of LDPC codes.

We investigate the case of independent Rayleigh faded paths between antenna elements and find that with high probability extraordinary capacity is available. Compared to the baseline n = 1 case, which by Shannon’s classical formula scales as one more bit/cycle for every 3 dB of signaltonoise ratio (SNR) increase, remarkably withMEAs, the scaling is almost like n more bits/cycle for each 3 dB increase in SNR. To illustrate how great this capacity is, even for small n, take the cases n = 2, 4 and 16 at an average received SNR of 21 dB. For over 99 of the channels the capacity is about 7, 19 and 88 bits/cycle respectively, while if n = 1 there is only about 1.2 bit/cycle at the 99 level. For say a symbol rate equal to the channel bandwith, since it is the bits/symbol/dimension that is relevant for signal constellations, these higher capacities are not unreasonable. The 19 bits/cycle for n = 4 amounts to 4.75 bits/symbol/dimension while 88 bits/cycle for n = 16 amounts t

本程序是用MATLAB语言，它包含每个块的物理层调制等描述，交织和所有的技巧和方法的物理层