1,289 research outputs found
Large Zero Autocorrelation Zone of Golay Sequences and -QAM Golay Complementary Sequences
Sequences with good correlation properties have been widely adopted in modern
communications, radar and sonar applications. In this paper, we present our new
findings on some constructions of single -ary Golay sequence and -QAM
Golay complementary sequence with a large zero autocorrelation zone, where
is an arbitrary even integer and is an arbitrary integer.
Those new results on Golay sequences and QAM Golay complementary sequences can
be explored during synchronization and detection at the receiver end and thus
improve the performance of the communication system
A Generalized Construction of OFDM M-QAM Sequences With Low Peak-to-Average Power Ratio
A construction of -QAM sequences is given and an upper bound of the
peak-to-mean envelope power ratio (PMEPR) is determined. Some former works can
be viewed as special cases of this construction.Comment: published by Advances in Mathematics of Communication
Conquer the fine structure splitting of excitons in self-assembled InAs/GaAs quantum dots via combined stresses
Eliminating the fine structure splitting (FSS) of excitons in self-assembled
quantum dots (QDs) is essential to the generation of high quality entangled
photon pairs. It has been shown that the FSS has a lower bound under uniaxial
stress. In this letter, we show that the FSS of excitons in a general
self-assembled InGaAs/GaAs QD can be fully suppressed via combined stresses
along the [110] and [010] directions. The result is confirmed by atomic
empirical pseudopotential calculations. For all the QDs we studied, the FSS can
be tuned to be vanishingly small ( 0.1 eV), which is sufficient small
for high quality entangled photon emission.Comment: 4 pages, 3 figure, 1 tabl
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