无线带内全双工信道的多用户最优分配问题模型

An Optimal Allocation Model of Wireless In-band Full-duplex Channel for Multiple Access

无线带内全双工(IBFD)具有频谱效率倍增潜力,应用到多用户接入时,共享信道的优化分配将决定系统容量的实际增益。该文分析多用户争用冲突的干扰特性及链路分配的约束条件,以容量最大为优化目标,针对双向全双工(BFD)、全双工中继(FDR)以及两者混合的传输模式,建立信道资源分配的问题模型。通过典型站点分布的最优解计算,分析IBFD系统相对半双工(HD)的容量增益。结果表明,BFD有理想的100%增益,而FDR有较大变化范围(最低增益25%)。此外,计算发现,站点间传输链路呈现1维链型结构的容量增益明显优于2维平面分布的链路结构。

The potential of wireless In-Band Full-Duplex（IBFD） in doubling spectral efficiency raises a special issue in channel allocation for Multi-user applications in capacity improvement. This paper presents an analysis on mutual interferences, contention conflicting and allocation constraints for different modes of full-duplex transmission. The maximization number of transmission links is chosen as the objective of multi-user system optimization, and a mathematic programming problem of IBFD channel allocation for three transmission modes, including Bidirectional Full-Duplex（BFD）, Full-Duplex Relay（FDR） and the mixed of two is proposed. The exact optimal solutions are researched for two kinds of typical topology to find the capacity improvement of IBFD to Half-Duplex（HD）. The results show that BFD multi-user system has an ideal capacity gain 100% in relative to HD, while FDR reveals a wide range of gain with 25% in the lowest. In addition, the gain of one dimensional chain of stations is found significantly superior to that of two-dimensional distribution.