【摘要】 该文提出了一种新的多用户超宽带系统模型,该模型基于MB-OFDM系统,各个用户的数据通过在时域和频域同时进行的一种编码(Time-FrequencyCode,TFC)进行区分。同时给出了针对这种系统的一种自适应TFC分配算法,该算法在保证每个用户的最小传输速率请求的前提下,使传输功率最小化。理论分析和实验表明,该系统及其相应的TFC分配算法可以有效地增加多速率用户接入系统的能力,并且有效地节省发射功率,而这正是一个超宽带系统所需要的。更多还原

【Abstract】 A novel multi-rate MB-OFDM ultra-wide band (UWB) system is proposed, in which users are distinguished from their unique time-frequency codes (TFC). Also an adaptive TFC allocation algorithm is given to minimize total transmitting power with the constraint of the minimal data rate requirement of each accessed user. Theoretical analysis and experimental results show that the proposed system and allocation algorithm are able to increase system access capacity of multi-rate users and save power effectively, which is just an UWB system needed.更多还原