Digital Down-conversion Technology Research And Application,

Digital down converting is one of the key technologies of software radio.It can improve the efficiency and reliability of communications.lt is also important to realize software radio receivers.The paper focuses on the technologies involved in digital down converting,such as integer sampling-rate conversion,non-integer sampling-rate conversion and carrier frequency offset estimation algorithm.On the base of these,the paper analyzes applications of digital down converting in the HSP50214B programmable downconverter.The hardware and sofeware of the application of digital down converting are also introduced. The paper presents a structure of the wideband digital receiver implemented on a high speed DSP platform.