Patent ID: 11877164
Assignee: CONSTELLATION DESIGNS, LLC
Field: Digital communication (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 0:
1. A method of receiving data, comprising:
receiving a signal at a receiver via a communication channel having a channel signal-to-noise ratio (SNR), where the receiver comprises a demodulator, a demapper, and a decoder;
demodulating the received signal into a demodulated signal using the demodulator and providing the demodulated signal to the demapper via a coupling between the demodulator and the demapper;
determining likelihoods using the demapper based upon the demodulated signal and a symbol constellation selected from a set of symbol constellations comprising:
a uniformly spaced QAM-64 symbol constellation; and
an unequally spaced Quadrature Amplitude Modulated 64 point (QAM-64) symbol constellation;

providing the determined likelihoods to the decoder via a coupling between the demapper and the decoder, where the decoder considers each bit-level separately; and
providing a sequence of received bits from the decoder to a sink device based upon the determined likelihoods and a low density parity check (LDPC) code having a code rate;
wherein the unequally spaced QAM-64 symbol constellation is characterized in that use of the unequally spaced QAM-64 symbol constellation in combination with the LDPC code provides an SNR gain of at least 0.2 dB compared to use of the uniformly spaced QAM-64 symbol constellation in combination with the LDPC code.