TY - JOUR
T1 - Differential encoding by a look-up table for quadrature-amplitude modulation
AU - Wei, Ruey Yi
PY - 2011/1
Y1 - 2011/1
N2 - In this paper, we propose a novel differential encoder for QAM (quadrature-amplitude modulation), by a look-up table instead of a rule. Using a table for differential encoding has the advantages of both low complexity and good error performance. We propose algorithms to construct the table for maximizing the minimum noncoherent distance and minimizing the number of different data bits between two codewords with small noncoherent distance. For 16QAM and 32QAM, we show that the differential encoders obtained by the proposed algorithms are optimal in terms of minimum noncoherent distance. Differential detectors for QAM, including a reduced-complexity two-symbol detector and multiple-symbol detectors, are proposed as well. Simulation results of 16QAM show that the proposed differential encoder provides significant gain over existent differential encoders as expected by distance analysis, and the proposed low-complexity multiple-symbol differential detector can further improve the error performance.
AB - In this paper, we propose a novel differential encoder for QAM (quadrature-amplitude modulation), by a look-up table instead of a rule. Using a table for differential encoding has the advantages of both low complexity and good error performance. We propose algorithms to construct the table for maximizing the minimum noncoherent distance and minimizing the number of different data bits between two codewords with small noncoherent distance. For 16QAM and 32QAM, we show that the differential encoders obtained by the proposed algorithms are optimal in terms of minimum noncoherent distance. Differential detectors for QAM, including a reduced-complexity two-symbol detector and multiple-symbol detectors, are proposed as well. Simulation results of 16QAM show that the proposed differential encoder provides significant gain over existent differential encoders as expected by distance analysis, and the proposed low-complexity multiple-symbol differential detector can further improve the error performance.
KW - Differential encoding
KW - noncoherent detection
KW - quadrature-amplitude modulation
UR - http://www.scopus.com/inward/record.url?scp=79551686318&partnerID=8YFLogxK
U2 - 10.1109/TCOMM.2010.102910.100061
DO - 10.1109/TCOMM.2010.102910.100061
M3 - 期刊論文
AN - SCOPUS:79551686318
SN - 0090-6778
VL - 59
SP - 84
EP - 94
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
IS - 1
M1 - 5628284
ER -