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A semi blind technique for estimating the carrier frequency offset in OFDM communication systems is presented in this paper. The fractional and integer frequency offsets are esti-mated by employing a few null subcarriers in the rst OFDM symbol in a frame. While the conventional null subcarrier based methods estimate the offset by a single global search, the proposed method employs a two stage estimator, which greatly minimize the computational complexity.

一种变异算子的蝙蝠算法来求解无人机路径规划问题。希望共同学习(A Bat Algorithm withMutation for UCAV Path Planning)

根据公汽线路信息数据，编写对任意车站，寻找通过该站的汽车线路的M文件； （3）编写M文件，对任意两个车站m,n，判断是否有线路通过这两车站，若有则编写寻找通过该站的汽车线路的M文件 （4）对任意两个车站m,n，若没有线路直接通过这两车站，编写通过一次转车而到达两站的M文件 (According to the bus line information and data to write on any station to find the M-file line through the station car (3) the preparation of the M-file, any two stations m, n, determine whether the line through these two stations, if write to find the M-file line through the station car (4) any two stations m, n, if there is no line directly through the two stations, the preparation time to change trains to reach the M-file of the two stations)

In this code of LSB steganography the first three bit of message image is extracted and hidden in the cover image.At receiving the bit is extracted and message is shown.

改进的粒子群算法在matlab中的应用，程序简单(Improved particle swarm algorithm in matlab, simple procedures)

MATLAB在时间序列建模预测及程序代码，可以通过本书学习简单的时间序列法及其源代码(MATLAB modeling in time series prediction and program code, you can book a simple time series study its source code)

汽车悬架仿真建模，比较好，适合初学者学习(Simulation modeling of vehicle suspension, the better for beginners to learn)

MIMO2by2_16QAM_SoIC+Turbo迭代检测simulink链路，编码方式为卷积码，收端采用软干扰抵消+APP译码进行迭代检测(MIMO2by2_16QAM_SoIC Turbo iterative testing Simulink Chains, coding for convolutional codes, admission-soft-interference cancellation APP iterative decoding Detection)

Current controller for inverter

说明：  MIMO注水原理的简单运用,有助于理解SVD分解,注水算法,不同发送天线上如何进行功率分配(MIMO injection principle of a simple application helps to understand SVD decomposition algorithm injection, Send different antennas on how power distribution)