Patent ID: 8121020

Claim:
A method for implementation of Quadrature Parallel-Layered Modulation (QLM) in a communications transmitter for communications over the same frequency bandwidth of a carrier frequency using time offset as a differentiating parameter, said method comprising the steps: generating a communications signal over a frequency bandwidth at the data symbol rate n p /T s wherein 1) each data symbol is encoded with information and has the same waveform 2) the Nyquist rate for the data symbol transmission is equal to 1/T s , 3) the Nyquist rate is equal to the bandwidth 1/T s of the data symbol waveform and is the data symbol transmission rate 1/T s which is sufficient to transmit all of the information in each data symbol, 4) n p is the increase in the Nyquist data rate supported by QLM, 5) this increase in Nyquist data rate can be viewed as increasing to n p the number of parallel communications channels supported by QLM at the data symbol rate 1/T s , 6) timing offset ΔT s equal to the data symbol spacing ΔT s =T s /n p is the differentiating parameter when viewing this increase in data symbol rate as parallel communications channels which are independent since the QLM demodulation algorithm recovers the data symbols and data symbol encoded information at the QLM data symbol rate n p /T s , 7) each of these parallel channels of communications has a unique timing offset which can be identified as the channel 1 data symbols with no timing offset, channel 2 data symbols with ΔT s offset, channel 3 data symbols with 2ΔT s offset, and continuing to channel n p data symbols with (n p −1)ΔT s offset, 8) which means one can transmit n p parallel layers of communications channels over the same frequency bandwidth and recover the information in a receiver with a QLM demodulation algorithm, up-converting the QLM signal to a radio frequency RF, power amplifying, transmitting the RF QLM signal using the communications transmitter, and receiving the transmitted RF QLM signal in a communications receiver, amplifying, down-converting, and QLM demodulating the received QLM signal following by decoding to recover the data symbol information.