Target codes
by Munibun Billah; Janak Sodha; Todd K. Moon
International Journal of Mobile Network Design and Innovation (IJMNDI), Vol. 10, No. 3, 2022

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.

Online publication date: Wed, 26-Oct-2022

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