摘要
在离散多音调制(DMT)系统中,每个符号块在进行传输前通常要加入循环前缀(CP),以保证子信道之间的相互独立性,消除符号块间的干扰。CP的长度等于有效信道冲激响应的记忆长度。较长的CP大大降低了DMT调制系统的传信率。为了避免采用较长的CP,通常在接收端采用有限冲激响应滤波器(FIR)缩短有效信道冲激响应的长度。文献[1]给出了计算最优缩短冲激响应滤波器(SIRF)抽头系数的算法,但该算法要求SIRF抽头的长度必须小于或等于目标冲激响应的记忆长度。本文改进了这种算法,使其可计算任意长度SIRF的抽头系数。
Based on analyses of self healing restoration,this paper presents the elliptic algorithm which reduces search fields of useless messages,and simulates the process of selfhealing restoration by computes Results show that the search region of ellipse is less than the region of mono and dual direction,the effects on nodes number are small and the search area can be rational set The cost is that it must be to construct the table of minimal search region in every node
出处
《通信学报》
EI
CSCD
北大核心
1998年第12期66-70,共5页
Journal on Communications
基金
国家教委高等学校博士学科点专项科研基金
邮电部切块基金