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| Content Provider | IET Digital Library |
|---|---|
| Author | Cao, Wei Li, Xiaotian Hu, Weidong Lei, Jing Zhang, Wenpeng |
| Abstract | This study proposes a low-complexity subcarrier-grouping-based multi-level Lloyd-Max (SG-ML-LM) algorithm to reconstruct orthogonal frequency division multiplexing (OFDM) reference signal in passive radar systems. The authors’ previously proposed multi-level Lloyd-Max (ML-LM) algorithm is originally intended to blindly estimate the narrowband flat fading channel coefficients for non-constant modulus constellations. The authors extend it into broadband wireless environment to blindly estimate the frequency-selective fading channel coefficients by exploiting OFDM signal structure properties. Then a SG-ML-LM algorithm is further proposed to reduce the computational complexity of ML-LM by utilising OFDM subcarrier correlation. Numerical results validate that: (i) ML-LM and SG-ML-LM algorithms are both feasible schemes to reconstruct OFDM reference signals for passive radar applications; (ii) compared with ML-LM algorithm, SG-ML-LM algorithm significantly reduces the computational complexity at the cost of blind channel estimation error, but the OFDM reference signal reconstruction accuracy is nearly maintained, so that the cross-ambiguity function performance is nearly lossless despite of a negligibly slight increase of main lobe Doppler bandwidth. |
| Starting Page | 873 |
| Ending Page | 879 |
| Page Count | 7 |
| ISSN | 17518784 |
| Volume Number | 11 |
| e-ISSN | 17518792 |
| Issue Number | Issue 5, May (2017) |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/iet-rsn/11/5 |
| Alternate Webpage(s) | https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2016.0340 |
| Journal | IET Radar, Sonar & Navigation |
| Publisher Date | 2016-09-01 |
| Access Restriction | Open |
| Rights Holder | © The Institution of Engineering and Technology |
| Subject Keyword | Blind Channel Estimation Error Broadband Wireless Environment Channel Estimation Communication Channel Equalisation And Identification Computational Complexity Cross-ambiguity Function Performance Fading Channel Frequency-selective Fading Channel Coefficient Modulation And Coding Method Narrowband Flat Fading Channel Coefficient Nonconstant Modulus Constellations OFDM Modulation OFDM Reference Signal Reconstruction Passive Radar Passive Radar System Radar Equipment Radar Signal Processing Radar Theory Signal Processing And Detection Signal Reconstruction Subcarrier-grouping-based Multi-level Lloyd-Max Algorithm System And Application |
| Content Type | Text |
| Resource Type | Article |
| Subject | Electrical and Electronic Engineering |
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