Adaptive modulation order for multi-user superposition transmissions with non-aligned resources

A method for wireless communication, comprising:

• receiving a transmission comprising a base layer associated with a first data stream and an enhancement layer associated with a second data stream, wherein the enhancement layer spans a resource set and the base layer spans a first subset of the resource set;
• determining a base modulation order associated with the base layer and an enhancement modulation order associated with the enhancement layer;
• and
• de-mapping symbols of the first subset of the resource set based on a combined constellation of the base modulation order and the enhancement modulation order to obtain a first set of de-mapped symbols associated with the second data stream, and symbols of a second subset of the resource set that is exclusive of the first subset of the resource set in at least one dimension based on an extended constellation of an extended modulation order to obtain a second set of de-mapped symbols associated with the second data stream, wherein the extended constellation is different from the combined constellation.

An apparatus for wireless communication, in a system comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• schedule a transmission comprising a base layer for a first user equipment (UE) and an enhancement layer for a second UE, wherein the enhancement layer spans a resource set and the base layer spans a first subset of the resource set;
• map a first encoded bit stream for the first UE and a first portion of a second encoded bit stream for the second UE to the first subset of the resource set using a combined constellation of a base modulation order associated with the base layer and an enhancement modulation order associated with the enhancement layer, and a second portion of the second encoded bit stream to a second subset of the resource set that is exclusive of the first subset of the resource set in at least one dimension using an extended constellation of an extended modulation order, wherein the extended constellation is different from the combined constellation;
• and
• transmit the transmission to the first UE and the second UE.

An apparatus for wireless communication, in a system comprising:

• a processor;
• memory in electronic communication with the processor;
• and
• instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
• receive a transmission comprising a base layer associated with a first data stream and an enhancement layer associated with a second data stream, wherein the enhancement layer spans a resource set and the base layer spans a first subset of the resource set;
• determine a base modulation order associated with the base layer and an enhancement modulation order associated with the enhancement layer;
• and
• de-map symbols of the first subset of the resource set based on a combined constellation of the base modulation order and the enhancement modulation order to obtain a first set of de-mapped symbols associated with the second data stream, and symbols of a second subset of the resource set that is exclusive of the first subset of the resource set in at least one dimension based on an extended constellation of an extended modulation order to obtain a second set of de-mapped symbols associated with the second data stream, wherein the extended constellation is different from the combined constellation.