Multi-rate coexistence scheme in DSSS O-QPSK network
AssigneeUniband Electronic Corp.
InventorsYiping Fan, Li-Feng Chen, Sheng-Wei Chiang, Chun-Chin Chen
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Abstract
An IEEE 802.15.4 DSSS Offset-QPSK device is proposed that allows an existing system to transfer Offset-QPSK modulation signal into MSK modulation signal, then deliver the MSK modulation signal without DSSS to increase payload data transmission rate. On-the-fly detection of whether a low data rate or a high data rate encoding mode is used for a received frame is attained by the transmitter setting a predetermined bit in the frame length byte of a transmitting frame. Thus an extra high data rate transmission for IEEE 802.15.4 DSSS Offset-QPSK systems can be provided.
Claims14
An Institute of Electrical and Electronics Engineers 802.15.4 direct-sequence spread spectrum (DSSS) Offset-Quadrature Phase-shift keying (Offset-QPSK) device comprising:
- a transmitter configured to set a predetermined bit in a frame length byte of a transmission frame to indicate whether the transmission frame is encoded by a standard encoding mode or by a proprietary encoding mode different from the standard encoding mode;
- and
- a receiver configured to decode a received transmission frame according to whether the predetermined bit in the received transmission frame indicates the received transmission frame is encoded by the standard encoding mode or by the proprietary encoding mode.
A method of operating an Institute of Electrical and Electronics Engineers 802.15.4 direct-sequence spread spectrum (DSSS) Offset-Quadrature Phase-shift keying (Offset-QPSK) device, the method comprising:
- setting a predetermined bit in a frame length byte of a transmission frame to indicate whether the transmission frame is encoded by a standard encoding mode or by a proprietary encoding mode different from the standard encoding mode;
- and
- decoding a received transmission frame according to whether the predetermined bit in the received transmission frame indicates the received transmission frame is encoded by the standard encoding mode or by the proprietary encoding mode.
Dependencies are inferred from the claim text.