Interference in CPFSK optical crossconnect systems with noncoherent detection

1994 ◽  
Vol 30 (25) ◽  
pp. 2156-2157
Author(s):  
J.C. Brown ◽  
J.C. Cartledge
Keyword(s):  
Noncoherent Detection ◽  
Optical Crossconnect

Optical Crossconnect Circuit With Intersecting Waveguides On InP Substrate

1989 ◽  
Author(s):  
M Erman ◽  
P. Jarry ◽  
H. Angenent ◽  
C. Graver ◽  
J. M. Auger ◽  
...  
Keyword(s):  
Optical Crossconnect ◽  
Inp Substrate

1100 x 1100 port MEMS-based optical crossconnect with 4-dB maximum loss

2003 ◽  
Vol 15 (11) ◽  
pp. 1537-1539 ◽  
Author(s):  
J. Kim ◽  
C.J. Nuzman ◽  
B. Kumar ◽  
D.F. Lieuwen ◽  
J.S. Kraus ◽  
...  
Keyword(s):  
Maximum Loss ◽  
Optical Crossconnect

Noncoherent Detection for Improving the Spectral Efficiency of OFDM-IM Systems

2020 ◽  
Vol 115 (4) ◽  
pp. 2767-2777
Author(s):  
R. Shantha Selvakumari ◽  
J. Jasline Tracia
Keyword(s):  
Spectral Efficiency ◽  
Noncoherent Detection

scholarly journals Advanced Noncoherent Detection in Massive MIMO Systems via Digital Beamspace Preprocessing

Telecom ◽  
2020 ◽  
Vol 1 (3) ◽  
pp. 211-227
Author(s):  
Stephan Bucher ◽  
Christian Waldschmidt
Keyword(s):  
Mimo Systems ◽  
Near Field ◽  
Multiple Input Multiple Output ◽  
Low Complexity ◽  
Base Station ◽  
Coherent Detection ◽  
Noncoherent Detection ◽  
Detection Scheme ◽  
Channel Knowledge ◽  
Residual Performance

Noncoherent detection in massive multiple-input/multiple-output (MIMO) uplink systems provides a low-complexity alternative to its coherent counterpart. Requiring no actual channel knowledge but the per-user induced power at the base station, comparable performance as channel-estimation-based detection can be achieved when the users are located in the near-field of the base station. However, noncoherent detection fails in scenarios where users are in the far-field due to an insufficient capability to separate the users in terms of their spatially induced power. For this purpose, a dielectric lens or an analog beamforming structure can be employed, which are capable to focus the power of the incident waves to a smaller subset of the antennas at the base station. These so-called analog beamspace techniques have been demonstrated to enable again the noncoherent detection scheme. Analogous to a spatial Fourier transform, beamspace techniques can be also realized in the digital domain offering more flexibility. Its applicability to noncoherent detection is studied in this paper. It is shown numerically that by means of digital beamspace preprocessing, considerable performance gains can be achieved. Applied in dominant line-of-sight channels, a large number of users can be accommodated and the residual performance gap to coherent detection with perfect channel knowledge is minimal.

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