Patent ID: 7855995
Filing Date: 2010-12-21
Classification: H04L

Abstract:
1. A method for implementation of Quadrature Parallel Layered Modulation (QLM) for communications over multiple channels, said method comprising the steps: consider a first set of n generating a first communications signal over a frequency bandwidth B at the carrier frequency f generating a second communications signal over a frequency bandwidth B at an offset carrier frequency f for any additional channels in the first set, continuing generation of communication signals over a frequency bandwidth B at an offset carrier frequency by modulating additional streams of data symbols with the same waveform at the same data symbol rate and timing as the first and second streams of data symbols, with frequency offsets increasing in each communication channel in increments of Δf=B/n continuing this generation of n for (ns−1)>0 generate a second set of n repeating the generation of n repeating the generation of n after the last set ns−1 of n transmitting and receiving said communications signals over a QLM communications link consisting of (ns−1)×n recovering data symbols of the communications signals in a receiver using a demodulation algorithm, and combining said algorithm with error correction decoding to recover the transmitted information; whereby frequency offsets have been used as a differentiating parameter to enable QLM parallel channels of communications over a frequency bandwidth ns×B or (ns−1)×B with a data symbol rate which could be above the Nyquist rate, to be demodulated.