Patent ID: 8917786

Claim:
A method for implementation of Quadrature Layered Modulation (QLM) for communications over the same frequency bandwidth of a carrier frequency, said method comprising the steps: generating a scaled communications signal over the frequency bandwidth at the carrier frequency by modulating a stream of data symbols with a waveform at a n p /T s symbol rate wherein “T s ” is the time interval between contiguous symbols for the original channel prior to implementation of QLM and n p is the increase in the data symbol rate using QLM and equivalently is the number of QLM channels when considering QLM to be a layered communications link, selecting said scaled value to compensate for the loss in the detectable signal energy caused by the interference of the overlapping signals, transmitting and receiving said scaled communications signal over a QLM communications link consisting of a modulated stream of data symbols with a waveform at a n p /T s symbol rate, recovering data symbols of the scaled communications signals in a receiver using a demodulation algorithm, and combining said algorithm with error correction decoding to recover the transmitted information; whereby time offsets between contiguous data pulses is the differentiating parameter to enable the QLM data symbol rate which is independent of the Nyquist rate, to be demodulated.