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RECEIVERS INCORPORATING UNEQUALLY SPACED CONSTELLATIONS THAT PROVIDE REDUCED SNR REQUIREMENTS AS COMPARED TO EQUALLY SPACED CONSTELLATIONS
RECEIVERS INCORPORATING UNEQUALLY SPACED CONSTELLATIONS THAT PROVIDE REDUCED SNR REQUIREMENTS AS COMPARED TO EQUALLY SPACED CONSTELLATIONS
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机译:接收器包含不等空的星座图,与同等空间的星座图相比,它们提供了降低的SNR要求
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摘要
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.
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