Abstract: A method for operating a contactlessly operating detection device for monitoring at least one monitoring area is described. In the method, transmission signals are successively sent into at least one monitoring area. Transmitted signals which are reflected in the monitoring area are received with the detection device, brought into a form to be processed with an evaluation device, and processed as received signals. Some of the signals are allocated to at least one signal block. Information about the monitoring area is determined from some of the received signals. Some of the received signals that follow one another in time are allocated to at least one received signal block at the receiving end of the detection device, independent of any allocations of transmission signals at the transmitting end of the detection device. Some of the received signals of the received signal blocks are subjected to signal processing in blocks.

Abstract: A method and a corresponding transmitting device to encode data with a differential space-time block code. A code matrix is calculated recursively from a momentary data matrix with a previous code matrix as a DSTBC block with symbols that are to be transmitted, the data matrix is formed from at least two data symbols that are to be transmitted, and the amplitude is modulated. Amplitude modulation data is encoded into an amplitude difference of at least two data symbols within each individual DSTBC block.

Abstract: A method and a corresponding transmitting device to encode data with a differential space-time block code. A code matrix is calculated recursively from a momentary data matrix with a previous code matrix as a DSTBC block with symbols that are to be transmitted, the data matrix is formed from at least two data symbols that are to be transmitted, and the amplitude is modulated. Amplitude modulation data is encoded into an amplitude difference of at least two data symbols within each individual DSTBC block.