Patent ID: 8817910

Claim:
A transmitter comprising: a UASK (amplitude shift keying with uneven distance) modulator or UQAM (quadrature amplitude modulation with uneven distance) modulator that generates a sequence of symbols from input bits by mapping input bits to a sequence of UASK constellations or UQAM constellations, without using superposition, the sequence of UASK or UQAM constellations comprising at least two different UASK or UQAM constellations with different constellation unevennesses, the sequence of symbols comprising at least one symbol from each of the sequence of UASK constellations or UQAM constellations; a codec that processes a first set of bits to produce a block of bits of a codec output; a bit stream mapper that sequences bits of the block of bits of the codec output to produce the input bits to the UASK modulator or UQAM modulator such that each bit of the block of bits is mapped to a respective position in the sequence of UASK or UQAM constellations; wherein after the block of bits is mapped and modulated, a signal containing symbols comprising the sequence of symbols is transmitted, and the transmitter is further configured to determine an adaptation parameter among a plurality of received adaptation inputs, to adaptively select an applicable constellation from among the at least two different UASK or UQAM constellations based on the determined adaptation parameter, to update the different constellation unevennesses from time to time based on the applicable constellation, and to transmit an indication of the update of the different constellation unevennesses to use with demodulation performed at the receiver, the indication including the adaptation parameter indicating the applicable constellation selected by the transmitter from among the at least two different UASK or UQAM constellations.