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|Title||(7,4) Hamming-like Code for QPSK Modulation|
Quadrature Phase Shift Keying (QPSK) is one of the most popular digital modulation techniques. It is widely used in existing technologies because of its spectral efficiency. In this paper, we present a (7, 4) code which can be directly applied on the phase of the QPSK constellation points. The code is based on the fundamental idea of the binary Hamming code. The decoding performance is enhanced by considering the minimum Euclidean distance between the received codeword and all codewords that that can be corrected using the same syndrome. The code can correct all the single symbol errors and 96.3% of double symbol errors at E b /N 0 = 8 dB. By simulation, it is shown that this approach can guarantee a coding gain of 1.5 dB with respect to uncoded QPSK. assigned to a unique syndrome. The correct codeword is chosen by considering the minimum Euclidean distance between the received codeword and every codeword that assigned to the same syndrome. This minimizes the number of searched sequences and hence reduces the ML decoding complexity. Moreover, it allows efficient use of soft-decoding approach on block codes whereas it is usually done in case of convolutional codes.
|Published in||Mosharaka International Conference on Wireless Communications and Mobile Computing,|
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