A low complexity baseband receiver for direct conversion burst-type radio systems

The interest for small size low complexity radio systems has resulted in examination of efficient architectures for transceiver implementation. This in turn has pushed towards smaller RF subsystems and efficient digital baseband sections. An all-digital low complexity baseband receiver is presented for a DECT radio system employing the direct conversion approach. This approach permits generation of in-phase and quadrature (I/Q) signal components. We present a novel approach for the differential detector using a finite state machine approach. The symbol timing algorithm uses oversampling only during the packet synchronization word whereas the frequency offset correction algorithm operates on the symbol rate permitting corrections up to 12% of the symbol rate. The symbol timing and the frequency correction algorithms are also implemented in an all-digital fashion emphasizing low complexity realization.