Method and receiving unit for the detection of data symbols

An incoherent receiving unit for the detection of data symbols contained in a received radio signal, the receiving unit being configured to:

• convert the received radio signal into a complex baseband signal sampled in the chip clock;
• generate a demodulated signal by differential demodulation of the complex baseband signal sampled in the chip clock;
• provide derived sequences, each derived sequence being assigned a PN sequence, allocable transmit-side, and includes derived chips whose values in each case correspond to a logic linking of the particular PN chips of the PN sequence allocable transmit-side to which the derived sequence is assigned;
• calculate correlation results by correlating the demodulated signals with the derived sequences;
• and
• derive the values of the data symbols by evaluating the correlation results.

An incoherent receiving unit for the detection of data symbols contained in a received radio signal, wherein transmit-side each data symbol is allocated a symbol value-specific PN sequence of successive PN chips in the chip clock and the PN sequences allocated to the data symbols are offset QPSK modulated, the receiving unit comprising:

• an internal receiver configured to convert the received radio signal into a complex baseband signal sampled in the chip clock;
• a differential demodulator connected to the internal receiver and configured to generate a demodulated signal by differential demodulation of the complex baseband signal sampled in the chip clock;
• a sequence providing unit configured to provide the derived sequences, whereby each derived sequence is assigned a PN sequence allocable transmit-side and includes derived chips whose values in each case correspond to a logic linking of the particular PN chips of the PN sequence allocable transmit-side to which the derived sequence is assigned;
• a correlation unit connected to the sequence providing unit and the differential demodulator and configured to calculate correlation results by correlating the demodulated signal with the derived sequences;
• and
• an evaluation unit connected to the correlation unit and configured to derive the values of the data symbols by evaluating the correlation results.

A transmitting/receiving device for a data transmission system according to IEEE Standard 802.15.4 in the 2.4 GHz band, the device comprising:

• an antenna;
• a transmitting unit connected to the antenna for transmitting data, the transmitting unit configured to allocate a symbol value-specific PN sequence of successive PN chips in a chip clock to each data symbol and to offset QPSK modulate the PN sequences allocated to the data symbols;
• an incoherent receiving unit connected to the antenna;
• and
• a control unit connected to the transmitting unit and the receiving unit for controlling the transmitting and receiving units,
• wherein the incoherent receiving unit comprises:
• an internal receiver configured to convert the received radio signal into a complex baseband signal sampled in the chip clock;
• a differential demodulator connected to the internal receiver and configured to generate a demodulated signal by differential demodulation of the complex baseband signal sampled in the chip clock;
• a sequence providing unit configured to provide the derived sequences, whereby each derived sequence is assigned a PN sequence allocable transmit-side and includes derived chips whose values in each case correspond to a logic linking of the particular PN chips of the PN sequence allocable transmit-side to which the derived sequence is assigned;
• a correlation unit connected to the sequence providing unit and the differential demodulator and configured to calculate correlation results by correlating the demodulated signal with the derived sequences;
• and
• an evaluation unit connected to the correlation unit and configured to derive the values of the data symbols by evaluating the correlation results.