Summary
International Symposium on Extremely Advanced Transmission Technologies
2019
Session Number:P
Session:
Number:P-22
MIMO capacity analysis for the MMSE detection in strongly-coupled SDM systems
Shohei Beppu, Daiki Soma, Hidenori Takahashi, Takehiro Tsuritani,
pp.-
Publication Date:2019/5/29
Online ISSN:2188-5079
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Summary:
"In order to further increase transmission capacity, space-division-multiplexing (SDM) systems are actively discussed. In SDM systems, fibers and/or amplifiers have mode dependent loss (MDL) or gain (MDG) which limit a multi-input multi-output (MIMO) capacity [1, 2]. Moreover, the MIMO capacity depends on the MIMO detection scheme. In ref. [2], the MDL dependency of MIMO capacity for a Bell Labs Layered Space-Time (BLAST) detection have been calculated and discussed. However, in recent experimental reports of SDM transmissions [4-6], a linear minimum mean square error (MMSE) detection with stochastic gradient descent, so-called LMS, is commonly used because the BLAST detection requires higher computational complexity in return for the better interference cancelling performance [3]. In this work, we calculated the MIMO capacity depending on MDL for the MMSE detection. The capacity was 39% degraded compared with the BLAST detection assuming a 64-times-repeatered strongly-coupled SDM system whose MDL is 5 dB per span."