Spreader & De-spreader

Programmable

PN Sequences

PN Sequences

Encoder

PN Sequences

Decoder

Transmit

Symbol

Received

Symbol

Transmit chip

(to TX_DATA)

Received chip

(from RX_DATA)

Spreader

De-spreader

1-bit

1-bit

4 sets of PN code (PN000, PN001, PN010, PN011)

Opposite phase encodes data field conjugate

3-bit data

Select 1 out of 8 sequences

Parallel correlation with 8

possible PN sequences

Select 1 out of 8 data pattern

based on correlator output

within the chip detection window

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