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针对不同通信系统的不同带宽要求,提出一种低复杂度数字带宽可配置调制器(D-BCM),该调制器基于数字基带的可配置速率变换模块,其中可配置速率变换模块将多种不同输入码率转换为同一输出码率,使得后端数模转换(DAC)和射频调制(RF)与传统调制器相同。其核心部件可配置速率变换模块由两部分组成:第一部分是可配置速率变换的上采样单元;第二部分是单一的去镜像滤波器,且通过对多种去镜像滤波器的比较得出Nyquist滤波器更适合低复杂度的实现要求。文中详细阐述D-BCM结构,并重点设计和实现可配置速率变换模块,最后在窄带系统中验证了调制器可行性。
Aiming at the different bandwidth requirements of different communication systems, a low complexity digital bandwidth configurable modulator (D-BCM) is proposed based on the digital baseband configurable rate conversion module, in which the configurable rate conversion module converts many different The input code rate is converted to the same output code rate, making the back-end digital-to-analog (DAC) and radio frequency modulation (RF) the same as a conventional modulator. The core part of the configurable rate conversion module consists of two parts: the first part is a configurable rate-varying upsampling unit; the second part is a single de-mirrored filter, and by comparing a variety of de-mirrors obtained Nyquist Filter is more suitable for low complexity implementation requirements. In this paper, the structure of D-BCM is described in detail, and the design and implementation of a configurable rate conversion module are emphasized. At last, the feasibility of the modulator in a narrow-band system is verified.