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All memory elements contain zero, at the beginning of every PPDU. The encoder shall also be placed in a known state at the end of every PPDU to prevent the data bits near the end of the PPDU from being decoded incorrectly. This is achieved by appending one octet containing all zeros to the end of the PPDU prior to transmission and discarding the final octet of each received PPDU. An encoder block diagram is shown in Figure 153C. It consists of two paths of four memory elements each. For every pair of data bits input, three output bits are generated.
The data portion is otherwise identical to the 22 Mbit/s ERP-PBCC modulations. The structure and clock speed of the preamble is the same as in Clause 18. An extra clock switch section between the preamble and the data portion is added, with the format described below. The same pulse shape shall be used in each clock domain. 24 Copyright © 2003 IEEE. All rights reserved. 5 MHz, the clock switching structure in Figure 153E is used. 5 Msymbol/s (QPSK). 5 Msymbol/s. The total clock switching time (tail and head and resync) is 1 µs.
All rights reserved. 5 MHz, the clock switching structure in Figure 153E is used. 5 Msymbol/s (QPSK). 5 Msymbol/s. The total clock switching time (tail and head and resync) is 1 µs. The tail bits are 1 1 1, the head bits are 0 0 0, and the resync bits are 1 0 0 0 1 1 1 0 1. The modulation is BPSK, which is phase synchronous with the previous symbol. 7. 4 is used to scramble the data symbols in the OFDM segment. Copyright © 2003 IEEE. All rights reserved. 1 Overview of the DSSS-OFDM PLCP PSDU encoding process This subclause contains the definitions and procedure for forming the PSDU portion of the DSSS-OFDM PLCP.