Power allocation for superposition transmission
AssigneeSamsung Electronics Co., Ltd.
InventorsHyukjoon KWON, Sandeep KRISHNAMURTHY, Linbo LI, Jungwon LEE
Life of this patent
Estimating the term…
Abstract
Apparatuses, systems, and methods are described for power allocation in a superposition multiple access communication system capable of using non-uniform joint constellations or super-constellations. In one method, the conditional probability of a correctly-received symbol and a normalized weighting coefficient is calculated for each receiver and then the sum of weighted efficiencies is calculated. The optimal power allocation is determined for each receiver by maximizing the sum of weighted spectral efficiencies.
Claims22
A method of power allocation in a superposition multiple access communication system capable of using uniform and non-uniform superposition constellations (super-constellations), comprising:
- for each receiver i receiving superposition multiple access transmission, calculating the conditional probability Pc,i of a bit being correctly received based on its location within the super-constellation;
- for each receiver i receiving superposition multiple access transmission, calculating a normalized weighting coefficient wi;
- calculating the sum S of weighted spectral efficiencies of all receivers i using the conditional probability Pc,i and normalized weighting coefficient wi of each receiver i;
- and
- determining the optimal power allocation α*i for receiver i by maximizing the sum of weighted spectral efficiencies.
A method for a user equipment (UE), comprising:
- receiving an indication that superposition transmission is being used to transmit to the UE;
- receiving an indication of which type of superposition transmission is being used to transmit to the UE, wherein at least one type of superposition transmission uses a Gray-mapped Non-uniform-capable Constellation (GNC) super-constellation;
- and
- receiving one or more superposition transmission parameters, including information concerning power allocation for the UE,
- wherein the power allocation for the UE was determined by:
- calculating the conditional probability of a bit being correctly received by the UE based on its location within the super-constellation;
- calculating a normalized weighting coefficient for the UE;
- calculating the sum of weighted spectral efficiencies of all UEs receiving superposition transmission using the conditional probabilities and normalized weighting coefficients of the all UEs;
- and
- determining the optimal power allocation for the UE by maximizing the sum of weighted spectral efficiencies.
An apparatus for power allocation in a superposition multiple access communication system capable of using uniform and non-uniform superposition constellations (super-constellations), comprising:
- at least one non-transitory computer-readable medium storing instructions capable of execution by a processor;
- and
- at least one processor capable of executing instructions stored on the at least one non-transitory computer-readable medium, where the execution of the instructions results in the apparatus performing a method comprising:
- for each receiver i receiving superposition multiple access transmission, calculating the conditional probability Pc,i of a bit being correctly received based on its location within the super-constellation;
- for each receiver i receiving superposition multiple access transmission, calculating a normalized weighting coefficient wi;
- calculating the sum S of weighted spectral efficiencies of all receivers i using the conditional probability Pc,i and normalized weighting coefficient wi of each receiver i;
- and
- determining the optimal power allocation α*i for receiver i by maximizing the sum of weighted spectral efficiencies.
A user equipment (UE), comprising:
- at least one non-transitory computer-readable medium storing instructions capable of execution by a processor;
- and
- at least one processor capable of executing instructions stored on the at least one non-transitory computer-readable medium, where the execution of the instructions results in the apparatus performing a method comprising:
- receiving an indication that superposition transmission is being used to transmit to the UE;
- receiving an indication of which type of superposition transmission is being used to transmit to the UE, wherein at least one type of superposition transmission uses a Gray-mapped Non-uniform-capable Constellation (GNC) super-constellation;
- and
- receiving one or more superposition transmission parameters, including information concerning power allocation for the UE,
- wherein the power allocation for the UE was determined by:
- calculating the conditional probability of a bit being correctly received by the UE based on its location within the super-constellation;
- calculating a normalized weighting coefficient for the UE;
- calculating the sum of weighted spectral efficiencies of all UEs receiving superposition transmission using the conditional probabilities and normalized weighting coefficients of the all UEs;
- and
- determining the optimal power allocation for the UE by maximizing the sum of weighted spectral efficiencies.
Dependencies are inferred from the claim text.