US 9,813,280 B2
Likelihood generation apparatus and method therefor
Yoshiaki Konishi, Chiyoda-ku (JP); Kenya Sugihara, Chiyoda-ku (JP); Yoshikuni Miyata, Chiyoda-ku (JP); Hideo Yoshida, Chiyoda-ku (JP); and Kazuo Kubo, Chiyoda-ku (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Chiyoda-ku (JP)
Appl. No. 15/112,652
Filed by MITSUBISHI ELECTRIC CORPORATION, Chiyoda-ku (JP)
PCT Filed Feb. 16, 2015, PCT No. PCT/JP2015/054107
§ 371(c)(1), (2) Date Jul. 19, 2016,
PCT Pub. No. WO2015/137049, PCT Pub. Date Sep. 17, 2015.
Claims priority of application No. 2014-049846 (JP), filed on Mar. 13, 2014.
Prior Publication US 2016/0344580 A1, Nov. 24, 2016
Int. Cl. H04L 27/34 (2006.01); H04L 27/38 (2006.01)
CPC H04L 27/3483 (2013.01) [H04L 27/38 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A likelihood generation apparatus for acquiring a likelihood of a 16-quadrature amplitude modulation (16QAM) signal, the likelihood generation apparatus comprising:
a first likelihood generation circuit configured to
generate a likelihood of each of two bits of each of 16QAM signal points of the 16QAM signal from a relationship of each of an I-axis component and a Q-axis component with a likelihood when each of the 16QAM signal points is mapped on a constellation diagram, and
output the likelihood of each of two bits to a soft decision error correction circuit to perform error correction processing; and
a second likelihood generation circuit configured to
generate a likelihood of each of remaining two bits other than the two bits of each of the 16QAM signal points of the 16QAM signal based on a position of each of the 16QAM signal points in a lookup table, the lookup table including the I-axis component and the Q-axis component of each of the 16QAM signal points, and a mapping of regions acquired by dividing the constellation diagram based on a possible value of each of the bits, and
output the likelihood for each of the remaining two bits to the soft decision error correction circuit to perform error correction processing.