基于稀疏傅里叶变换的LTE-A多点协作异步干扰抵消方法

LTE-A Multi-point Cooperative Asynchronous Interference Cancellation Method Based on Sparse Fourier Transform

针对LTE-A多点协作复杂性高、规模大,使得在异步干扰抵消时,很难直接将多点协作异步干扰进行消除的问题,提出基于稀疏傅里叶变换的LTE-A多点协作异步干扰抵消方法。通过分析LTE-A异构网络环境及受干扰情况。引入傅里叶变换方法对LTE-A信号进行稀疏化处理,使其达到稀疏性特征条件,按照稀疏表示方式对信号进行描述。针对LTE-A中受多点协作异步干扰的信号,将稀疏系数较大的部分看作有效信号;将稀疏系数较小的部分看作多点协作异步干扰部分。依据受干扰信号在稀疏基上的稀疏特征将有效部分和干扰部分分离,从而实现多点协作异步干扰的抵消。实验结果表明,改进方法能够有效抵消LTE-A多点协作异步干扰,其抵消后功率谱输出及SINR值更加接近无干扰下的功率谱输出及SINR值,保证了网络使用质量,具有一定的实用性。

Because of the high complexity and large scale of LTE-A multi point cooperation,it is difficult to eliminate the multi point cooperative asynchronous interference directly when the asynchronous interference is counteracted.A LTE-A multi-point cooperative asynchronous interference cancellation method based on sparse Fourier transform is proposed.Through the analysis of LTE-A heterogeneous network environment and interference situation,Fourier transform method is introduced to sparse the LTE-A signal so that it can achieve sparse feature conditions and describe the signal in sparse representation.According to the signal by coordinated multi-point asynchronous interference in LTE-A,part of the large sparse coefficient as the valid signal,sparse coefficients smaller as part of coordinated multi-point asynchronous interference,based on sparse feature interference in sparse signal based on the separating part and the interference part,so as to realize the coordinated multi-point asynchronous interference cancellation.The experimental results show that the improved method can effectively counteract LTE-A coordinated multi-point asynchronous interference,the power spectrum of the output offset and SINR values closer to the power spectrum of the output without interference and SINR value,and guarantee the network service quality,has a certain practicality.