System and method for power saving coding in integer cycle or impulse type modulation transmissions
View Patent ↗A system and method for substantially reducing average transmit power by omitting the transmission of a majority of pulses by using a modified run length coding to reduce signal power. By lowering the average power, an opportunity is presented to either decrease the total power drawn by the transmitter (battery life) or raise the peak power of all symbols (Eb/No), thereby increasing range of a RF transmission system.
1. A method to reduce the transmit power of an integer cycle or impulse type modulated signal comprised of a coded binary data string sent between a transmitter and a receiver comprising;
said transmitter transmitting a coded binary data string using a first modulation system;
said transmitter analyzing said coded binary data string then locating and identifying in said coded binary data string one of two or more repeating binary patterns comprised of a repeating pattern of symbols starting with a first symbol and ending with a last symbol;
said transmitter at the start of said located and identified repeating binary pattern transmitting said first symbol of said repeating binary pattern using a second modulation system wherein the type of second modulation system used modulates using a different method of modulation from said first modulation system and indicates said located and identified repeating binary pattern;
said transmitter at the end of said located and identified repeating binary pattern transmitting said last symbol of said repeating binary pattern using said second modulation system;
said transmitter not transmitting any of said repeating pattern of symbols between said first and last symbols of said located and identified repeating binary pattern; and, said receiver receiving said transmitted coded binary data string including said first and last symbols and determining from the type of said second modulation system used for transmission of said first and last symbols said located and identified repeating binary pattern and inserting back into said coded binary data string said repeating pattern of symbols that were not transmitted using a synchronized clock indicating a symbol for each clock period.
2. The method of claim 1 wherein said first modulation system is a Binary Phase Shift Keying signal with standard phase thresholds of zero degrees and said second modulation system is 4-Quadrature Amplitude Modulated signals with a phase shift of ninety degrees and an amplitude shift.
3. The method of claim 2 wherein said repeating pattern of symbols comprises repeating ones, repeating zeros, repeating ones and zeros, or repeating zeros and ones.
4. The method of claim 3 wherein a coding method that maximizes the length of said repeating binary patterns is used to generate said coded binary data string.