To solve the large noise problem for the lowprecision gyroscopes in micro-electro mechanical systems (MEMS) of inertial navigation system, an improved noise reduction method, based on the analyses of the fast Fourier transformation (FFT) noise reduction principle and the simple wavelet noise reduction principle, was proposed. Furthermore, the FFT noise reduction method, the simple wavelet noise reduction method and the improved noise reduction method were comparatively analyzed and experimentally verified in the case of the constant rate and dynamic rate. The experimental analysis results showed that the improved noise reduction method had a very good result in the noise reduction of the gyroscope data at different frequencies, and its performance was superior to those of the FFT noise reduction method and the simple wavelet noise reduction method.

针对激光器的相位噪声会严重影响相干光正交频分复用(COOFDM)系统的性能问题,基于空载波间隔提出了一种适用于COOFDM系统的新相位噪声补偿算法,通过空载波来间隔信息子载波,从而有效降低载波间干扰并提高有效信息干扰比。仿真结果表明：与最小平方准则公共相位误差(LSCPE)算法相比,该补偿算法能有效地改善系统的误码性能,降低系统对激光器线宽的要求。

对伽利略卫星系统中E1信号的四种捕获算法: 自相关旁瓣消除方法(ASPecT)、filtered相关法、类二进制相移键控法(BPSKLike)和偏移正交BOC互相关法(OQCC)进行了详细理论分析。采集了真实的伽利略卫星E1信号进行捕获算法的仿真分析, 并从基本捕获结果、计算复杂度、相关主峰均值比和检测性能等方面进行了对比分析。仿真结果表明OQCC相关法和其他算法相比, 性能更优异, 能更有效地提高主峰值与去除副峰。所以OQCC相关法更适合推广, 具有更高的实用价值。

基于SCG(4,k)码的构造方法对SCG-LDPC码进行优化改进, 构造一种适用于光通信系统的新颖LDPC(3969,3720)码, 通过增大其码长, 构造码率为95.1%的新颖SCG-LDPC(6561,6240)码, 使其码率更符合光通信系统的高码率要求。并用SCG-LDPC(6561,6240)码与码率为94.5%的BCH(127,120)码进行级联, 构造出一种新颖的BCH(127,120)+LDPC(6561,6240)级联码。仿真分析表明: 在误码率为10-7时, 新构造的BCH(127,120)+LDPC(6561,6240)级联码的净编码增益比已广泛应用于光通信系统的经典RS(255,239)码和SCG-LDPC(6561,6240)码分别提高了2.27dB和0.49dB。因而该级联码更适合于光通信系统。