Maximum-likelihood synchronization of a single user for code-division multiple-access communication systems

1998 ◽  
Vol 46 (3) ◽  
pp. 392-399 ◽  
Author(s):  
S.E. Bensley ◽  
B. Aazhang
Keyword(s):  
Maximum Likelihood ◽  
Code Division Multiple Access ◽  
Communication Systems ◽  
Multiple Access ◽  
Single User ◽  
Code Division Multiple

scholarly journals Constructions of asymptotically optimal codebooks with respect to Welch bound and Levenshtein bound

2021 ◽  
Vol 0 (0) ◽  
pp. 0
Author(s):  
Gang Wang ◽  
Deng-Ming Xu ◽  
Fang-Wei Fu
Keyword(s):  
Code Division Multiple Access ◽  
Communication Systems ◽  
Multiple Access ◽  
Cross Correlation ◽  
Hadamard Matrices ◽  
Circulant Matrices ◽  
Asymptotically Optimal ◽  
Welch Bound ◽  
Construction Methods ◽  
Code Division Multiple

<p style='text-indent:20px;'>Codebooks with small maximum cross-correlation amplitudes are used to distinguish the signals from different users in code division multiple access communication systems. In this paper, several classes of codebooks are introduced, whose maximum cross-correlation amplitudes asymptotically achieve the corresponding Welch bound and Levenshtein bound. Specially, a class of optimal codebooks with respect to the Levenshtein bound is obtained. These classes of codebooks are constructed by selecting certain rows deterministically from circulant matrices, Fourier matrices and Hadamard matrices, respectively. The construction methods and parameters of some codebooks provided in this paper are new.</p>

scholarly journals LARGE-SCALE MIMO MC-CDMA SYSTEM USING COMBINED MULTIPLE BEAMFORMING AND SPATIAL MULTIPLEXING

2018 ◽  
Vol 56 (1) ◽  
pp. 102 ◽  
Author(s):  
Nguyen Huu Trung ◽  
Doan Thanh Binh
Keyword(s):  
System Performance ◽  
Code Division Multiple Access ◽  
Communication Systems ◽  
Multiple Access ◽  
Large Scale ◽  
Spatial Multiplexing ◽  
Propagation Loss ◽  
Fifth Generation ◽  
Simulation Results ◽  
Code Division Multiple

This paper proposes a novel Large-scale (massive) Multi-input Multi-output Multi-carrier Code division multiple access (LS MIMO MC-CDMA) model and application to Fifth-Generation Mobile Communication Systems (5G). This system uses combined cylindrical array antenna multiple beamforming architecture with spatial multiplexing. The model is optimized by Min-Max criteria in order to minimize side lobes and maximize compression of propagation loss. The Monte Carlo simulation results unify with the analytical solution for system performance.

scholarly journals Kinerja Data Rate Koneksi HSDPA Pada Jaringan WCDMA

2020 ◽  
Vol 26 (2) ◽  
Author(s):  
Slamet Pranoto ◽  
Mufti Gafar ◽  
Kun Wardhana
Keyword(s):  
Code Division Multiple Access ◽  
Multiple Access ◽  
High Speed ◽  
Data Rate ◽  
Mobile Data ◽  
Single User ◽  
Packet Access ◽  
Code Division Multiple

Teknologi High Speed Downlink Packet Access (HSDPA) adalah teknologi mobile data dengan kecepatan tinggi yang merupakan pengembangan dari generasi ketiga Wideband Code Division Multiple Access (WCDMA) yang mampu mentransmisikan data hingga 7.2 Mbps pada single user.Pada analisa kecepatan data HSDPA di Node B BHAKTIJAYAMW menampilkan parameter Payload, Throughput, dan Jumlah user HSDPA. Selain itu dilakukan juga pengukuran PING untuk mengetahui time respon saat melakukan koneksi ke Internet. Dari hasil analisa menunjukkan bahwa kecepatan data maksimum pada kondisi multiuser yang dapat dicapai dari hasil pengukuran statistik data adalah 3.14 Mbps, sedangkan dari hasil perhitungan pengukuran langsung sebesar 2.76 Mbps. Hasil tersebut masih jauh dari kecepatan data 7.2 Mbps untuk layanan HSDPA yang tersedia berdasarkan data vendor, karena kecepatan 7.2 Mbps hanya dapat diakses dengan single user, dan untuk multiuser akan terjadi sharing data.

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