Radio receivers for cellular networks: Possible architectures using a ΣΔ-converter

摘要: We first explain the constraints set on a receiver for digital cellular systems before showing how they are handled with standard architectures (direct conversion and superheterodyne). introduce then new approach based direct sampling of intermediate frequency in superheterodyne using passband analog- to- ΣΔ -converter. give design rules to minimize complexity system study within that scope interest under sampled -converters addressing more especially stability problems. Undersampling allows reduce processing load part converter, compared conversion. The last chapter is dedicated presentation networks order justify receivers designed this environment.