面向IR-UWB基于直接序列设计抑制窄带干扰算法  

Direct-sequence Approach for Narrowband Interference Suppression in Impulse Radio Ultra-wideband Systems

作　　者：胡峰[1,2] 汤昕怡[1] 史广顺[2] 

机构地区：[1]南京信息职业技术学院通信学院,江苏南京210023 [2]南开大学信息技术科学院机器智能研究所,天津300071

出　　处：《电视技术》2014年第23期136-141,共6页Video Engineering

摘　　要：针对窄带系统对超宽带冲激无线电系统(Impulse Radio Ultra-wideband,IR-UWB)的干扰问题,提出基于Rayleighritz理论的直接序列(Direct Sequence,DS)设计方案,记为RRDS。通过设计DS序列,使得IR-UWB频谱在窄带干扰频率点上产生陷波,从而实现抑制干扰的目的,同时,通过RRDS方案,提高IR-UWB系统的误码率。RRDS方案先建立目标矩阵,并求解最小特征值及对应的特征向量。如果特征向量里面的元素有非+1或-1的值,则通过符号函数将特征向量转变为全部由+1,-1组成。若最小特征值是多重,先将所有的特征向量通过符号函数转变为全部由+1或-1组成的向量,并在这些向量里找出使目标矩阵的值最小的特征向量,将此向量作为直接序列DS。仿真结果表明,提出的RRDS方案有效地抑制窄带干扰,并提高了IR-UWB系统的误码率。Abstract For mutual interference between Impulse radio Uhra-wideband（IR-UWB） and narrowband system, the Ralyeigh-dtz theory-based Di- rect sequence （DS） design scheme is proposed in this paper, marked as RRDS. Notch frequencies are created in the ultra-wide bandwidth signal spectrum by DS design in order to suppress the interference from narrowband systems. Moreover, Bit error ratio performance of IR-UWB is improved by RRDS scheme. In RRDS scheme, the goal matrix is firstly established, and solved the minimum eigenvalues corresponding eigenvectors. The ele- ment is set to ＋ 1 or -1 by sign function when element in eigenvector is neither ＋ 1 nor -1. When the minimum eigenvalue is multiple, the total cigenvectors consist of ＋ 1 or-1 by sign function, and find out the eigenvector, which makes goal matrix minimum. Tile eigenvector is chosen as DS. Numerical results show that these designs can significantly suppress the mutual interference between ultra-wide bandwidth and narrowband services, and improve the BER of IR-UWB.

关 键 词：IR—UWB 窄带干扰 直接序列 Rayleigh-Ritz 陷波频率 误码率 

分 类 号：TN929.533[电子电信—通信与信息系统]