	US 12,244,441 B2
	Communication unit for soft-decision demodulation and method therefor
Robert G. Maunder, Southampton (GB); and Aryan Tavakkoli, Chilworth (GB)
Assigned to AccelerComm Limited, Southampton (GB)
Appl. No. 18/015,507
Filed by AccelerComm Limited, Southampton (GB)
PCT Filed Jul. 9, 2021, PCT No. PCT/EP2021/069168 § 371(c)(1), (2) Date Jan. 10, 2023, PCT Pub. No. WO2022/013097, PCT Pub. Date Jan. 20, 2022.
Claims priority of application No. 2010773 (GB), filed on Jul. 13, 2020; and application No. 2104419 (GB), filed on Mar. 29, 2021.
Prior Publication US 2023/0261912 A1, Aug. 17, 2023
Int. Cl. H04L 25/03 (2006.01); H03M 13/00 (2006.01); H03M 13/29 (2006.01); H04B 1/707 (2011.01); H04L 25/06 (2006.01); H04L 27/22 (2006.01); H04L 27/227 (2006.01)

CPC H04L 25/03318 (2013.01) [H03M 13/2957 (2013.01); H03M 13/6325 (2013.01); H04B 1/707 (2013.01); H04L 25/067 (2013.01); H04L 27/22 (2013.01); H04L 27/2278 (2013.01)]

20 Claims

1. A communication unit for performing soft-decision demodulation comprising a receiver, wherein the receiver is arranged to receive a transmitted signal conveying a first set of bits comprising k bits that has been selected from a set of 2^kpossible signals, wherein the receiver comprises:

a demodulator comprising a bank of 2k correlators and configured to:

detect a transmission of each possible transmitted signal, and

output 2k magnitudes of correlator outputs, based on the detected possible transmitted signals, by the bank of 2k correlators as a first set of inputs; and

a de-mapper circuit coupled to the demodulator and configured to receive the first set of inputs and:

determine statistics derived from a plurality of aggregated correlator output magnitude distributions of the first set of inputs, wherein the plurality of aggregated correlator output magnitude distributions is fewer than 2^2k; and

calculate a first set of aposteriori soft bits comprising k soft bits from the determined statistics and output the first set of aposteriori soft bits comprising k soft bits.