Target codes. (19th October 2022)

• Record Type: Journal Article
• Authors: Billah, Munibun; Sodha, Janak; Moon, Todd K.
• Is Part Of: International journal of mobile network design and innovation. Volume 10:Number 3(2022)
• Page Start: 166
• Page End: 174
• Publication Date: 2022-10-19
• Subjects: convolutional codes -- block codes -- shape codes -- error-control -- QPSK -- quadrature phase shift keying -- QAM -- quadrature amplitude modulation; Mobile communication systems -- Periodicals; Wireless communication systems -- Design and construction -- Periodicals; 384.535
• Languages: English
• ISSNs: 1744-2869

Abstract

A new type of error-control code is proposed in which a signal point within the modulator signal constellation diagram is selected as the target signal point. An incoming signal point is then encoded by using the number of steps along a pre-defined path to the target point. By introducing a state variable, trellis based decoding is made possible. The encoding process is generalised for M-ary QAM with high rate encoding to present the BER performance of signal point target codes (SPTCs) over quadrature phase shift keying (QPSK), 16-QAM, 64-QAM and 256-QAM signal constellations. Free Euclidean distance calculations are used to modify the encoding algorithm to develop constellation arithmetic codes (CACs) with an improved coding gain. For example, a rate 2/3 CAC code using partial parallel encoding provides a BER coding gain of 5.5 dB over uncoded 64-QAM.