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

專利號(hào)
US11889325B2
公開日期
2024-01-30
申請人
Constellation Designs, LLC（US PA Wayne）
發(fā)明人
Maged F. Barsoum; Christopher R. Jones
IPC分類
H04W24/02; H04L1/00; H04L27/34; H04L5/00; H04W72/0453; H04W72/044
技術(shù)領(lǐng)域
capacity,pam,snr,optimized,pd,fading,rayleigh,in,snrs,channel
地域： PA PA Wayne

摘要

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 dmin, 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.

說明書

A still further additional embodiment includes a transmitter configured to transmit signals to a receiver via a communication channel, where the transmitter, includes a coder configured to receive user bits and output encoded bits at an expanded output encoded bit rate, a mapper configured to map encoded bits to symbols in a symbol constellation, a modulator configured to generate a signal for transmission via the communication channel using symbols generated by the mapper, where the receiver, includes a demodulator configured to demodulate the received signal via the communication channel, a demapper configured to estimate likelihoods from the demodulated signal, and a decoder that is configured to estimate decoded bits from the likelihoods generated by the demapper. In addition, the symbol constellation is a PAM-16 symbol constellation having constellation points within at least one of the ranges specified in FIGS. 48-71.

權(quán)利要求

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