A novel low-latency BICM system by quantizing the constellation on the demodulation end
Jianping Li, Yameng Shi · 2015
This paper proposes a new demodulation structure by quantizing the constellation and using a lookup table.When the modulated noisy symbols are received by demodulation end, it's not to calculate the Euclidean distances between a symbol and every constellation points, but quantize each dimension of this symbol's coordinate value in the constellation, and check the bit soft values corresponding to this quantification point against a lookup table which is known by a pretreatment.The proposed method will omit a large number of the calculations for demodulation and simplifies the system.Employing look-up table instead of traditional computing can reduce the delay by 72.4% to 93.9% when the quantification interval is from 0.1 to 0.4.Meanwhile, the performance gain only reduces about 0.1dB.