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Byte synchronization is achieved by a continuous sync word search. The sync word is a 16 bit configurable field (can be repeated to get a 32 bit) that must be inserted at the start of the packet by the transmitter (for example the CC115L, CC110L, or CC1101). The MSB in the sync word must be transmitted first. The demodulator uses this field to find the byte boundaries in the stream of bits. The sync word will also function as a system identifier, since only packets with the correct predefined sync word will be received if the sync word detection in RX is enabled in register MDMCFG2 (see Section 5.12.1). The sync word detector correlates against the user-configured 16 or 32 bit sync word. The correlation threshold can be set to 15/16, 16/16, or 30/32 bits match. The sync word can be further qualified using the preamble quality indicator mechanism described below and/or a carrier sense condition. The sync word is configured through the SYNC1 and SYNC0 registers.
