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Header which contains the synchronization header, the default ID information (for RF signal recognition), the header flag (Manchester encoded binary 0110), the synchronization header is used to wake MC33594's internal circuitry, and by the RF carrier frequency PLL locks; default ID information is used to identify matching system information; if the default ID information matches, start the Data Manager, and then determine whether the header arrives after the official receiver receives the header data. the tire loaded when the transmitter and the receiver placing the vehicle, the vehicle itself is equivalent to a shielding case. The data receiving rate is the receiver can be reliably received in each frame of data transmitted from the transmitter, not only the sensitivity of the receiver and transmitter of the transmission power, there is a significant factor: a considerable attenuation of the signal, plus the plurality of transmitters and the data conflicts ambient interference, leading to system data reception rate is low. Bit error rate refers to the signal transmitted from the transmitter during the transmission of the external environment because of interference resulting in erroneous data received by the receiver, resulting in lower system reliability. TPMS is a measure tire pressure, temperature, etc., involving wireless transceiver system security information, the signal reliability is always the design issues to consider. TPMS MPXY8020 based on the design, we use a high gain transmit antenna and matching circuit to transmit power to achieve the desired design requirements, particularly in the receiving side in addition to the matching circuit design, on the one hand, according to the car radio transmission path analysis, dual antenna reception mode; the other hand, according to the multi-transmitter transmitting signals randomness and conflicting.
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