Modulator and modulation method using non-uniform 16-symbol signal constellation for low-density parity check codeword having 2/15 code rate

摘要

A modulator and a modulation method using a non-uniform 16-symbol signal constellation are disclosed. The modulator includes a memory and a processor. The memory receives a codeword corresponding to a low-density parity check (LDPC) code having a code rate of 2/15. The processor maps the codeword to 16 symbols of the non-uniform 16-symbol signal constellation on a 4-bit basis.

主权项

1. A modulator using a non-uniform 16-symbol signal constellation, comprising:
a memory configured to receive a codeword having a code rate of 2/15; and a processor configured to map the codeword to 16 symbols of the non-uniform 16-symbol signal constellation on a 4-bit basis, wherein the 16 symbols are defined as shown in the following Table:TABLEwConstellation0 0.7062 + 0.7075i1 0.7075 + 0.7062i2 0.7072 + 0.7077i3 0.7077 + 0.7072i4−0.7062 + 0.7075i5−0.7075 + 0.7062i6−0.7072 + 0.7077i7−0.7077 + 0.7072i8 0.7062 − 0.7075i9 0.7075 − 0.7062i10 0.7072 − 0.7077i11 0.7077 − 0.7072i12−0.7062 − 0.7075i13−0.7075 − 0.7062i14−0.7072 − 0.7077i15 −0.7077 − 0.7072i.