Constellation Designs, LLC

Applied Micro Circuits Corporation

Maged F Barsoum

Christopher Richard Jones

Dariush Dabiri

Jinwen Xi

Communication systems are described that use signal constellations, which have unequally spaced (i.e. 'geometrically' shaped) points. In many embodiments, the communication systems use specific geometric constellations that are capacity optimized at a specific SNR. In addition, ranges within which the constellation points of a capacity optimized constellation can be perturbed and are still likely to achieve a given percentage of the optimal capacity increase compared to a constellation that maximizes d, are also described. Capacity measures that are used in the selection of the location of constellation points include, but are not limited to, parallel decode (PD) capacity and joint capacity.

Methods and apparatuses for signaling with geometric constellations

Communication systems are described that use signal constellations, which have unequally spaced (i.e. 'geometrically' shaped) points. In many embodiments, the communication systems use specific geometric constellations that are capacity optimized at a specific SNR, over the Rayleigh fading channel. In addition, ranges within which the constellation points of a capacity optimized constellation can be perturbed and are still likely to achieve a given percentage of the optimal capacity increase compared to a constellation that maximizes d, are also described. Capacity measures that are used in the selection of the location of constellation points include, but are not limited to, parallel decode (PD) capacity and joint capacity.

Systems and methods for receiving data transmitted using non-uniform QAM 256 constellations via fading channels

Systems and methods for receiving data transmitted using non-uniform QAM 256 constellations

Methods and apparatuses for signaling with geometric constellations in a Rayleigh fading channel

Communication systems are described that use unequally spaced constellations that have increased capacity compared to conventional constellations operating within a similar SNR band. One embodiment is a digital communications system including a transmitter transmitting signals via a communication channel, the transmitter including a coder capable of receiving user bits and outputting encoded bits at a rate, a mapper capable of mapping encoded bits to symbols in a constellation, and a modulator capable of generating a modulated signal for transmission via the communication channel using symbols generated by the mapper, wherein the constellation is unequally spaced and characterizable by assignment of locations and labels of constellation points to maximize parallel decode capacity of the constellation at a given signal-to-noise ratio so that the constellation provides a given capacity at a reduced signal-to-noise ratio compared to a uniform constellation that maximizes the minimum distance between constellation points of the uniform constellation.

Methods of receiving data transmitted using non-uniform multidimensional constellation and code rate pairs

Methods of transmitting data using non-uniform constellations with overlapping constellation point locations

Methods of communicating data transmitted using non-uniform multidimensional constellation and code rate pairs

Methods of transmitting data using non-uniform multidimensional constellation and code rate pairs

Methods of receiving data transmitted using non-uniform constellations with overlapping constellation point locations

Methods of receiving data using uniform and non-uniform constellations with rings

Methods of transmitting data using unequally spaced constellations that provide reduced SNR requirements as compared to equally spaced constellations

Methods of receiving data transmitted using unequally spaced constellations that provide reduced SNR requirements as compared to equally spaced constellations

Methods of receiving data using unequally spaced and uniform quadrature amplitude modulated 64 point symbol constellations

Methods of receiving data using unequally spaced quadrature amplitude modulated 64 point symbol constellations

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San Jose, CA, United States of America

Maged F Barsoum