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The given examples show that the standard 16-QAM Golay-Davis-Jedwab (GDJ) complementary sequences (CSs) cannot be yielded whenever the non-standard generalized Boolean functions (GBFs) are fed to Chong, et al's construction. Due to the fact that there exist a large number of the non-standard GBFs available, this paper focuses on the conversion from a non-standard GBF to 16-QAM CSs. By improving Chong,...
A sequence with several nonzero nontrivial autocorrelation values is referred to as an almost perfect sequence, which is widely applied to communications, radar, and so forth. In this paper, such sequences over the 16-QAM constellation are investigated and their construction methods are presented. By making use of differently proposed methods, the numbers of nonzero nontrivial autocorrelation values...
Golay complementary sequences play quite an important role in communication and radar. In this paper, we present a family of quaternary Golay complementary sequences. The resultant sequences result from conversion of the existing binary Golay sequences, and both have the same length and number of subsequences. Our method can provide rich quaternary Golay complementary sequences due to a large number...
In this letter, we present a family of 16-QAM periodic complementary sequences (PCSs), including three constructions. Our basic idea is to transform the known quaternary PCSs/GCSs (Golay complementary sequences) into the required ones. In order to guarantee that such transformation of every construction is successful, the own sufficient conditions of three constructions are derived, respectively....
The sequences with optimal autocorrelation have lots of application scenarios in communication, radar, and so forth. This paper focuses on the construction of the quaternary sequences with optimal autocorrelation. Based on the known binary sequences with optimal autocorrelation and odd length, the interleaving technique and the reverse Gray mapping, a method for constructing the optimal quaternary...
The spread-spectrum communication systems making use of the spreading sequences over the QAM constellation are with high transmission data rate. In order to satisfy the above mentioned systems' requirement, the ZCZ sequences over 16-QAM constellation are discussed and three constructions for producing such sequences are presented from the known binary ZCZ sequences. Moreover, if the binary ZCZ sequences...
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