MIMO Equalization Method under Ultra-Low Delay in Orthogonal Mode Multiplexing System
An orthogonal mode, ultra-low delay technology, applied in baseband systems, transmission systems, digital transmission systems, etc., can solve the problems of large system delay, complex structure, high algorithm complexity, reduce system delay, speed up The effect of convergence speed
Active Publication Date: 2021-01-05
NANJING UNIV OF INFORMATION SCI & TECH
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But at the same time, in modern high-speed optical communication, such as the MIMO system using the LMS algorithm, due to its complex structure and high algorithm complexity, the system has a large delay, and it is still difficult to meet user needs.
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[0097] Taking the six-mode optical fiber transmission system as an example, a 6*6 MIMO equalization system is constructed, which is realized by 36 transverse filter arrays. The filter structure in each mode of the six-mode optical fiber is as follows: image 3 Shown:
[0098] In the six-mode optical fiber transmission system, the 6*6MIMO equalization structure is as follows: Figure 4 As shown, the cost function in the RLS algorithm is optimized through the introduction of matrix sparsity, and the recursive formula of filter tap coefficients is further obtained.
[0099] β is a constant, and the recursive formula of W(n) is,
[0100] ;
[0101] .
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The invention discloses an MIMO equalization algorithm under ultralow time delay in an orthogonal mode multiplexing system. The invention belongs to the technical field of digital signal processing MIMO equalization. An adaptive equalizer is divided into a feed-forward filter and a feedback filter. The feed-forward filter and the feedback filter are trained at a training end, wherein a non-significant weight (i.e., an equalizer tap coefficient) which does not actively participate in the training and optimization process can introduce a regular term 10-norm into an error performance function torealize approaching to a zero term; according to the invention, the RLS algorithm is utilized to carry out sparsification processing on the equalizer, so that the relatively unimportant weight tendsto zero, and the sparsity is introduced to add a cost function based on the 10-norm to correct the updating equation of the weight. By introducing sparsity, the convergence rate of MIMO equalization in the few-mode multi-core optical fiber system is greatly increased, and the system time delay is reduced.
Description
technical field [0001] The invention belongs to the technical field of digital signal processing MIMO equalization, and in particular relates to a MIMO equalization method under ultra-low time delay in an orthogonal mode multiplexing system. Background technique [0002] With the continuous growth of computing power and storage capacity of communication and network systems, a large number of user applications brought about by the high-speed growth of wireless and wired access, data traffic is increasing sharply. [0003] According to available data, the demand for transmission capacity of the global communication system is increasing exponentially every year. New communication modes such as cloud storage, interactive network television (IPTV), transoceanic video conferencing, and large-scale online games continue to emerge, and the amount of data they generate on the network is also increasing. In the past ten years, researchers have made various efforts on single-mode opti...
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IPC IPC(8): H04L25/03H04B7/0413
CPCH04B7/0413H04L25/03057
Inventor 刘博忻向军任建新毛雅亚韩顺王瑞春沈磊吴泳锋孙婷婷赵立龙
Owner NANJING UNIV OF INFORMATION SCI & TECH