Patent ID: RE39983

Claim:
A method of transmitting information comprising the steps of: providing a data signal representative of the information and comprising in-phase (I) and quadrature (Q) components and encoded with a forward error correction code, the forward error correction code being capable of extending error rate performance to a value of energy per bit to noise density ratio ( E b /N o ) less than 4 dB ; biasing at least one of the I and Q components with an offset comprising a direct current (DC) offset; generating a quadrature phase shift keyed (QPSK) waveform based upon a carrier signal: and the at least one biased component; and transmitting the QPSK waveform ; receiving the transmitted QPSK waveform; processing the received QPSK waveform to extract said carrier signal therefrom; processing the received QPSK waveform using the carrier signal extracted therefrom to derive said data signal; and decoding the encoded data signal to recover said information from said data signal .