RF simplex spread spectrum receiver and method

A method of receiving a biorthogonally modulated signal including a selection bit and polarity bit, the method comprising the steps of:

• receiving the biorthogonally modulated signal;
• estimating the selection bit;
• decoding the selection bit estimate according to an error correction code;
• re-encoding the decoded selection bit estimate using said code;
• and
• estimating the polarity bit of the received biorthogonally modulated signal using the re-encoded selection bit.

A receiver for receiving biorthogonally modulated signals including selection bits and polarity bits when M>2, the receiver comprising:

• at least four different signal generators and corresponding correlators for determining correlation sums of a received biorthogonally modulated signal when M>2;
• a soft-decision combined metric for combining estimated selection bit data having log.sub.2 M bits, with reliability information including additional bits so as to improve error performance of the receiver;
• and
• a decoder for decoding the selection bit data and reliability information forwarded by said combined metric.