Please use this identifier to cite or link to this item: http://localhost:80/handle/Hannan/147865
Title: Multiple-Symbol Differential Sphere Detection and Decision-Feedback Differential Detection Conceived for Differential QAM
Authors: Chao Xu;Soon Xin Ng;Lajos Hanzo
subject: Absolute-amplitude differential phase-shift keying (ADPSK)|differential quadrature amplitude modulation (DQAM)|Schnorr–Euchner search strategy|differential-amplitude phase-shift keying (DAPSK)|multiple-symbol differential sphere detection (MSDSD)|decision-feedback differential detection (DFDD)
Year: 2016
Publisher: IEEE
Abstract: Multiple-symbol differential sphere detection (MSDSD) relies on the knowledge of channel correlation. More explicitly, for differential phase-shift keying (DPSK), the transmitted symbols' phases form a unitary matrix, which can be separated from the channel's correlation matrix by the classic multiple-symbol differential detection (MSDD), so that a lower triangular matrix extracted from the inverted channel correlation matrix is utilized for the MSDSD's sphere decoding. However, for differential quadrature amplitude modulation (DQAM), the transmitted symbols' amplitudes cannot form a unitary matrix, which implies that the MSDD's channel correlation matrix becomes amplitude dependent and remains unknown unless all the data-carrying symbol amplitudes are detected. To tackle this open problem, in this paper, we propose to determine the MSDD's nonconstant amplitude-dependent channel correlation matrix with the aid of a sphere decoder (SD) so that the classic MSDSD algorithms that were originally conceived for DPSK may also be invoked for DQAM detection. As a result, our simulation results demonstrate that the MSDSD-aided DQAM schemes substantially outperform their DPSK counterparts. However, the price paid is that the detection complexity of MSDSD is also significantly increased. To mitigate this, we then propose a reduced-complexity MSDSD search strategy specifically conceived for DQAM constellations, which separately map bits to their ring-amplitude index and phase index. Furthermore, the classic decision-feedback differential detection (DFDD) conceived for DQAM relies on a constant channel correlation matrix, which implies that these DFDD solutions are suboptimal and that they are not equivalent to the optimum MSDD operating in decision-feedback mode. With the advent for solving the open problem of MSDSD-aided DQAM, we further propose to improve the conventional DFDD-aided DQAM solutions in this paper.
URI: http://localhost/handle/Hannan/147865
ISSN: 0018-9545
1939-9359
volume: 65
issue: 10
More Information: 8345
8360
Appears in Collections:2016

Files in This Item:
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Title: Multiple-Symbol Differential Sphere Detection and Decision-Feedback Differential Detection Conceived for Differential QAM
Authors: Chao Xu;Soon Xin Ng;Lajos Hanzo
subject: Absolute-amplitude differential phase-shift keying (ADPSK)|differential quadrature amplitude modulation (DQAM)|Schnorr–Euchner search strategy|differential-amplitude phase-shift keying (DAPSK)|multiple-symbol differential sphere detection (MSDSD)|decision-feedback differential detection (DFDD)
Year: 2016
Publisher: IEEE
Abstract: Multiple-symbol differential sphere detection (MSDSD) relies on the knowledge of channel correlation. More explicitly, for differential phase-shift keying (DPSK), the transmitted symbols' phases form a unitary matrix, which can be separated from the channel's correlation matrix by the classic multiple-symbol differential detection (MSDD), so that a lower triangular matrix extracted from the inverted channel correlation matrix is utilized for the MSDSD's sphere decoding. However, for differential quadrature amplitude modulation (DQAM), the transmitted symbols' amplitudes cannot form a unitary matrix, which implies that the MSDD's channel correlation matrix becomes amplitude dependent and remains unknown unless all the data-carrying symbol amplitudes are detected. To tackle this open problem, in this paper, we propose to determine the MSDD's nonconstant amplitude-dependent channel correlation matrix with the aid of a sphere decoder (SD) so that the classic MSDSD algorithms that were originally conceived for DPSK may also be invoked for DQAM detection. As a result, our simulation results demonstrate that the MSDSD-aided DQAM schemes substantially outperform their DPSK counterparts. However, the price paid is that the detection complexity of MSDSD is also significantly increased. To mitigate this, we then propose a reduced-complexity MSDSD search strategy specifically conceived for DQAM constellations, which separately map bits to their ring-amplitude index and phase index. Furthermore, the classic decision-feedback differential detection (DFDD) conceived for DQAM relies on a constant channel correlation matrix, which implies that these DFDD solutions are suboptimal and that they are not equivalent to the optimum MSDD operating in decision-feedback mode. With the advent for solving the open problem of MSDSD-aided DQAM, we further propose to improve the conventional DFDD-aided DQAM solutions in this paper.
URI: http://localhost/handle/Hannan/147865
ISSN: 0018-9545
1939-9359
volume: 65
issue: 10
More Information: 8345
8360
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7364286.pdf2.09 MBAdobe PDFThumbnail
Preview File
Title: Multiple-Symbol Differential Sphere Detection and Decision-Feedback Differential Detection Conceived for Differential QAM
Authors: Chao Xu;Soon Xin Ng;Lajos Hanzo
subject: Absolute-amplitude differential phase-shift keying (ADPSK)|differential quadrature amplitude modulation (DQAM)|Schnorr–Euchner search strategy|differential-amplitude phase-shift keying (DAPSK)|multiple-symbol differential sphere detection (MSDSD)|decision-feedback differential detection (DFDD)
Year: 2016
Publisher: IEEE
Abstract: Multiple-symbol differential sphere detection (MSDSD) relies on the knowledge of channel correlation. More explicitly, for differential phase-shift keying (DPSK), the transmitted symbols' phases form a unitary matrix, which can be separated from the channel's correlation matrix by the classic multiple-symbol differential detection (MSDD), so that a lower triangular matrix extracted from the inverted channel correlation matrix is utilized for the MSDSD's sphere decoding. However, for differential quadrature amplitude modulation (DQAM), the transmitted symbols' amplitudes cannot form a unitary matrix, which implies that the MSDD's channel correlation matrix becomes amplitude dependent and remains unknown unless all the data-carrying symbol amplitudes are detected. To tackle this open problem, in this paper, we propose to determine the MSDD's nonconstant amplitude-dependent channel correlation matrix with the aid of a sphere decoder (SD) so that the classic MSDSD algorithms that were originally conceived for DPSK may also be invoked for DQAM detection. As a result, our simulation results demonstrate that the MSDSD-aided DQAM schemes substantially outperform their DPSK counterparts. However, the price paid is that the detection complexity of MSDSD is also significantly increased. To mitigate this, we then propose a reduced-complexity MSDSD search strategy specifically conceived for DQAM constellations, which separately map bits to their ring-amplitude index and phase index. Furthermore, the classic decision-feedback differential detection (DFDD) conceived for DQAM relies on a constant channel correlation matrix, which implies that these DFDD solutions are suboptimal and that they are not equivalent to the optimum MSDD operating in decision-feedback mode. With the advent for solving the open problem of MSDSD-aided DQAM, we further propose to improve the conventional DFDD-aided DQAM solutions in this paper.
URI: http://localhost/handle/Hannan/147865
ISSN: 0018-9545
1939-9359
volume: 65
issue: 10
More Information: 8345
8360
Appears in Collections:2016

Files in This Item:
File Description SizeFormat 
7364286.pdf2.09 MBAdobe PDFThumbnail
Preview File