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

專利號
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

In a further embodiment, the code is a Turbo code. In another embodiment, the code is a LDPC code.

In a still further embodiment, the constellation provides an increase in capacity over the Rayleigh fading channel at a predetermined SNR that is at least 5% of the gain in capacity achieved by a constellation optimized for joint capacity at the predetermined SNR.

In still another embodiment, the constellation provides an increase in capacity over the Rayleigh fading channel at a predetermined SNR that is at least 20% of the gain in capacity achieved by a constellation optimized for joint capacity at the predetermined SNR.

In a yet further embodiment, the constellation provides an increase in capacity at a predetermined SNR over the Rayleigh fading channel that is at least 50% of the gain in capacity achieved by a constellation optimized for joint capacity at the predetermined SNR.

In yet another embodiment, the constellation provides an increase in capacity over the Rayleigh fading channel at a predetermined SNR that is at least 90% of the gain in capacity achieved by a constellation optimized for joint capacity at the predetermined SNR.

In another embodiment again, the constellation provides an increase in capacity over the Rayleigh fading channel at a predetermined SNR that is at least 100% of the gain in capacity achieved by a constellation optimized for joint capacity at the predetermined SNR.

In a further additional embodiment, the constellation provides an increase in capacity over the Rayleigh fading channel at a predetermined SNR that is at least 5% of the gain in capacity achieved by a constellation optimized for PD capacity at the predetermined SNR.

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