双正交变换域扩频通信抗干扰技术

Biorthogonal Transform Domain Interference Suppression Technique

引入一种新的调制重叠双正交变换(MLBT)用于扩频通信窄带干扰抑制.与Malvar的MLBT相比,新的MLBT采用优化的窗函数生成基函数,其综合基函数具有更大的阻带衰减和更快的衰减速率,可更有效地将连续波干扰信号的能量压缩在有限的变换域子带内.仿真结果表明,基于这种MLBT的干扰抑制方法可有效抑制连续波干扰和窄带高斯干扰,其性能明显优于调制重叠变换.

A new modulated lapped biorthogonal transform (MLBT) was introduced for narrowband interference suppression in spread spectrum communications. Compared with Malvar's MLBT, the proposed MLBT utilizes optimized windows to construct the basis functions. The synthesis basis functions of the proposed MLBT have better stopband attenuation and faster decay velocity, thus, they are more efficient in confining the energy of continuous wave (CW) tone jammer to the least number of transform bins. The simulation results show that the lapped biorthogonal transform domain interference excision technique based on the proposed MLBT is capable of excising CW interference and narrowband Gaussian interference with performance superior to that of the modulated lapped transform (MLT) based excision technique.