duochiduxiaobodebianyuanjiancesuanfa

In a normal communication channel, it is often desirable to concentrate the information in as narrow a region of the frequency spectrum as possible in order to conserve available bandwidth and to reduce power. The basic spread spectrum technique, on the other hand, is designed to encode a stream of information by spreading the encoded data across as much of the frequency spectrum as possible. This allows the signal reception, even if there is interference on some frequencies. While there are many variations on spread spectrum communication, we concentrated on Direct Sequence Spread Spectrum encoding (DSSS). The DSSS method spreads the signal by multiplying it by a chip, a maximal length pseudorandom sequence modulated at a known rate. Since the host signals are in discrete-time format, we can use the sampling rate as the chip rate for coding.

基于穷举法实现的LDPC码的校验H矩阵的自动生成程序，并且有一定的去小环的功能。如果最后的结果趋缓结果不理想，可以适当加大变量GENE的初始值，它表明程序穷举的次数，预置为500次。(Method Based on the exhaustive LDPC check matrix H automatic generation procedures, and to a certain small part of the function. If the final results of the slowdown in the outcome is unsatisfactory, it may be appropriate variables LCRA increase on the initial value It shows that the number of procedures exhaustive, preset to 500.)

这是一个实现信号的FM调制的文档，你可以快速实现信号的FM调制(This is a signal of the FM modulation to achieve a document, you can quickly implement FM modulation signal)

当水下存在多个目标时，利用平均声强器检测已经不再有效，此时使用复平均声强器来确定多目标的方位。(When existing multi sources, average acoustic intensity does work. At this case, complex average acoustic intensity can obtain the direction of multi sources.)

解决传统人工势场法的目标不可达缺陷，通过改进斥力函数，解决问题(To solve the traditional artificial potential field goal unreachable defect)

有关粒子群算法的简单编程，对于初学粒子群的人很有帮助(The particle swarm algorithm is simple program for beginners who PSO helpful)

可见光通信中，采用OOKNRZ调制方式时的系统误码率，自己跑过，没问题的。(BER of OOKNRZ in visible light communication system)

this program takes the input from any txt or doc and fills the values in the excel sheet useful for putting the values after taking from any program out put

matlab环境下的高斯白噪声生成，设计，及说明(matlab environment generated white Gaussian noise, design, and description)

A partir d un son, permet de reperer les tonales selon en utilisant l echelle de Bark