A novel family of quadrature amplitude modulation (QAM) Golay complementary sequences (GCSs), in this paper, is presented. The resultant QAM GCSs employ binary signals rather than quaternary signals as their inputs. N...
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ISBN:
(纸本)9781509037100
A novel family of quadrature amplitude modulation (QAM) Golay complementary sequences (GCSs), in this paper, is presented. The resultant QAM GCSs employ binary signals rather than quaternary signals as their inputs. New sequences are fit for being applied to such QAM systems whose inputs merely are binary signals. In addition, the proposed sequences have the larger family size than the previously-known relevant sequences with the same peak envelope power (PEP) upper bounds.
This paper presents an efficient construction of two-dimensional (2D) complete complementary codes (CCCs) for their modern application as omnidirectional precoding matrices in massive MIMO systems to attain enhanced c...
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ISBN:
(纸本)9781665421607;9781665421591
This paper presents an efficient construction of two-dimensional (2D) complete complementary codes (CCCs) for their modern application as omnidirectional precoding matrices in massive MIMO systems to attain enhanced cell coverage. Unlike the traditional 1D CCCs, little progress has been made on efficient and systematic constructions of the 2D counterpart. In contrast to the existing recursive constructions with the aid of various sequence operations, certain 1D seed sequences or 2D arrays, we propose to use 2D generalized boolean functions for direct synthesis of 2D CCCs. Simulation results show that the proposed 2D CCCs appear to be good candidates for precoding matrices to achieve omnidirectional transmission in massive MIMO systems.
This paper improves the family size of quadrature amplitude modulation (QAM) complementary sequences with binary inputs. By employing new mathematical description: B-type-2 of 4(q)-QAM constellation (integer q >= 2...
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This paper improves the family size of quadrature amplitude modulation (QAM) complementary sequences with binary inputs. By employing new mathematical description: B-type-2 of 4(q)-QAM constellation (integer q >= 2), a new construction yielding 4(q)-QAM complementary sequences (CSs) with length 2(m) (integer m >= 2) is developed. The resultant sequences include the known QAM CSs with binary inputs as special cases, and the family sizes of new sequences are approximately 2(2.2q) (4q) (1) (2(2.2q) (3) - 1) times as many as the known. Also, both new sequences and the known have the same the peak envelope power (PEP) upper bounds, when they are used in an orthogonal frequency-division multiplexing communication system.
Correlation-immune (CI) multi-output booleanfunctions have the property of keeping the same output distributions when some input variables are fixed. Recently, a new application of CI functions has appeared in the sy...
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Correlation-immune (CI) multi-output booleanfunctions have the property of keeping the same output distributions when some input variables are fixed. Recently, a new application of CI functions has appeared in the system of resisting side-channel attacks (SCA). In this paper, three new methods are proposed to characterize the tth-order CI multi-output (n-input and m-output) booleanfunctions. The first characterization is to regard the multi-output booleanfunctions as the corresponding generalized boolean functions. It is shown that a generalized boolean function f(g) is a tth-order CI function if and only if the Walsh transform of f(g) defined here vanishes at all points with Hamming weights between 1 and t. The last two methods are generalized from Fourier spectral characterizations. Especially, Fourier spectral characterizations are efficient to characterize the symmetric multi-output CI booleanfunctions. (C) 2020 Elsevier B.V. All rights reserved.
A novel family of quadrature amplitude modulation (QAM) Golay complementary sequences (GCSs), in this paper, is presented. The resultant QAM GCSs employ binary signals rather than quaternary signals as their inputs. N...
详细信息
ISBN:
(纸本)9781509037117
A novel family of quadrature amplitude modulation (QAM) Golay complementary sequences (GCSs), in this paper, is presented. The resultant QAM GCSs employ binary signals rather than quaternary signals as their inputs. New sequences are fit for being applied to such QAM systems whose inputs merely are binary signals. In addition, the proposed sequences have the larger family size than the previously-known relevant sequences with the same peak envelope power (PEP) upper bounds.
Based on the description Q-type-2 of quadrature amplitude modulation (QAM) constellation and standard Golay-Davis-Jedwab (GDJ) quaternary complementary sequences (CSs), this paper presents a new family of QAM Golay co...
详细信息
ISBN:
(纸本)9781509037117
Based on the description Q-type-2 of quadrature amplitude modulation (QAM) constellation and standard Golay-Davis-Jedwab (GDJ) quaternary complementary sequences (CSs), this paper presents a new family of QAM Golay complementary sequences (GCSs), and determines their family size. The proposed QAM GCSs includes the known QAM GCSs from Cases I-III constructions as a special case. It is worthy of mentioning that the family size of new sequences is fairly larger than the one of the known sequences so that the code rate of the code consisting of new sequences is improved, which therefrom results in the increase of number of sub-carriers in OFDM communication systems employing the resultant QAM GCSs. More clearly, in a 64-QAM OFDM communication system whose signals are encoded by QAM GCSs, the number of sub-carriers in this system is at most 16 when the known QAM GCSs from Cases I-III constructions are employed. However, such number can be increased up to 32 when the proposed QAM GCSs are used. Finally, it should be pointed out that the peak envelope power (PEP) upper bounds, educed from the usage of both new and known QAM GCSs in an OFDM communication system, are the same.
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