System and method for data scrambling to reduce the crest factor in an OFDM waveform

A method for minimizing the peak voltage of the tones in an orthogonal frequency division multiplexed (OFDM) communication, the method comprising:

• accepting a message including digital data;
• randomizing digital data patterns in the message, creating a randomized message, using data stored in a table of scrambling vectors;
• mapping the randomized message into OFDM tones;
• and
• transmitting the OFDM tones.

A system for the communication of orthogonal frequency division multiplexed (OFDM) tones having a minimized peak power level, the system comprising:

• a base station including:
• a transmitter having a port to accept a first message including digital data, the transmitter including a scrambler to randomize the pattern of digital data in the first message, a scrambling vector table storing a plurality of scrambling vectors, a modulator to modulate the randomized first message, and a mapper to map the modulated first message into OFDM tones for transmission by a power amplifier;
• and
• a receiver to accept transmitted OFDM tones, the receiver including a de-mapper to de-map received OFDM tones into a modulated second message, a demodulator to demodulate the modulated second message into a randomized second message, a descrambler to de-randomize the second message and to provide the second message at a port;
• and
• a remote unit including:
• a transmitter having a port to accept the second message including digital data, the transmitter having a scrambler to randomize the pattern of digital data in the second message, a modulator to modulate the randomized second message, and a mapper to map the modulated second message into OFDM tones for transmission by a power amplifier to the base station;
• and
• a receiver to accept OFDM tones transmitted from the base station, the receiver including a de-mapper to de-map the OFDM tones into the modulated first message, a demodulator to demodulate the randomized first message, a descrambler to de-randomize the randomized first message and to provide the first message at a port.