| 摘要 |
A method of generating an rf signal for transmitting binary information in a packet format including a header field followed by a data field. The method comprises the steps of: spread spectrum encoding a sequence of first data symbols from said binary information within said header field by combining said first data symbols with a spreading sequence generated at a predetermined chip rate; encoding a sequence of N-bit second data symbols, where N is greater than 1, from said binary information within said data field by generating for each of said N-bit second data symbols one of a set of 2<N> chip sequences generated at the same chip rate as said spreading sequence: and applying the spread-spectrum encoded symbols of said header field and the selected chip sequences of said data field to the I and Q inputs of a phase shift modulator to produce said rf signal. <IMAGE> |
