On the Cramér-Rao Bound of Time-Varying Narrowband Leaked MIMO OFDM Channels
| Autor: | Urbashi Mitra, Amr Elnakeeb |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Computer science
Orthogonal frequency-division multiplexing 010102 general mathematics Bandwidth (signal processing) Estimator 020206 networking & telecommunications Data_CODINGANDINFORMATIONTHEORY 02 engineering and technology MIMO-OFDM 01 natural sciences Narrowband Convex optimization 0202 electrical engineering electronic engineering information engineering 0101 mathematics Algorithm Cramér–Rao bound Computer Science::Information Theory Communication channel |
| Zdroj: | SPAWC |
| DOI: | 10.1109/spawc.2018.8446022 |
| Popis: | In this paper, the problem of time-varying narrowband leaked Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO OFDM) channel estimation is considered. Practical constraints on communication systems, e.g. finite bandwidth and block length cause leakage rendering a sparse channel into a non-sparse one. The current work extends prior work on single carrier and OFDM; herein, it is shown that leaked MIMO OFDM channel is also separable in the delay and Doppler domains. A convex optimization approach, based on the atomic norm heuristic and bilinear representation of the channel, is adapted for channel estimation. The Cramer-Rae Bound (CRB) on the leaked MIMO OFDM channel estimation is derived. Simulation results show superiority of the atomic norm-based bilinear channel estimator over the classical l 1 element-wise sparse method and an adaptive MIMO OFDM channel estimator; with an average 6.3 dB and 2 dB improvement, respectively. Comparison of the CRB with simulation, shows that the proposed algorithm is essentially optimal. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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