ICI Cancellation Based on MIMO Decoding for FTN Non-Orthogonal FDM Systems

被引:16
作者
Guo, Mengqi [1 ]
Qiao, Yaojun [1 ]
Zhou, Ji [2 ]
Tang, Xizi [1 ]
Qi, Jia [1 ]
Liu, Shuangyue [1 ]
Xu, Xuekai [1 ]
Lu, Yueming [3 ]
机构
[1] BUPT, Sch Informat & Commun Engn, State Key Lab Informat Photon & Opt Commun, Beijing 100876, Peoples R China
[2] Jinan Univ, Coll Informat Sci & Technol, Dept Elect Engn, Guangzhou 510632, Guangdong, Peoples R China
[3] BUPT, Minist Educ, Key Lab Trustworthy Distributed Comp & Serv, Beijing 100876, Peoples R China
基金
中国国家自然科学基金; 国家重点研发计划;
关键词
Multiple-input multiple-output (MIMO) decoding; faster-than-Nyquist non-orthogonal frequency-division multiplexing (FTN-NOFDM); bandwidth-limited systems; NYQUIST; ALGORITHM; LATTICE; TRANSMISSION; SEARCH;
D O I
10.1109/JLT.2018.2885791
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper, we investigate multiple-input multiple-output (MIMO) decoding in faster-than-Nyquist non-orthogonal frequency-division multiplexing (FTN-NOFDM) for inter-carrier interference (ICI) cancellation. The MIMO decoding is based on depth-first tree search or breadth-first tree search. The sphere decoder (SD) is a commonly used decoding algorithm based on the depth-first tree search. Maximum-likelihood detection with QR decomposition and M-algorithm (QRM-MLD) is a commonly used decoding algorithm based on the breadth-first tree search. By adding the initial radius to both SD and QRM-MLD, the computational complexity of these can be further decreased without the lass of the ICI cancellation performance. In the experiment, SD, QRM-MLD, and their corresponding simplified versions are used for the ICI cancellation in a 28-Gb/s FTN-NOFDM system with transmission over a 10-km standard single-mode fiber. The 3-dB equivalent bandwidth of this system is only approximately 5.5 GHz. Under serious high-frequency distortion caused by limited bandwidth, the bit error rate performance of the FTN-NOFDM can still reach the forward error correction limit due to the bandwidth compression and effective ICI cancellation. FTN-NOFDM with 20% and 30% bandwidth savings has approximately 13- and 1.1-dB improvements in receiver sensitivity compared to FTN-NOFDM with 10% bandwidth savings, respectively. To the best of our knowledge, this paper is the first experimental demonstration of the depth-first tree search and breadth-first tree search for FTN-NOFDM in a bandwidth-limited optical transmission system. The experimental results show that FTN-NOFDM is a promising scheme for bandwidth-limited systems.
引用
收藏
页码:1045 / 1055
页数:11
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