Abstract
In this paper, we present a novel sequence design for efficient channel estimation in multiple input multiple output filterbank multicarrier (MIMO-FBMC) system with offset QAM modulation. Our proposed sequences, transmitted over one FBMC/OQAM symbol, are real-valued in the frequency domain and display zero-correlation zone properties in the time-domain. The latter property enables optimal channel estimation for a least-square estimator in frequency-selective fading channels. To further improve the system performance, we mitigate the data interference by an iterative feedback loop between channel estimation and FBMC demodulation. Simulation results validate that our proposed real-valued orthogonal sequences and the iterative channel estimation and demodulation scheme provide a practical solution for enhanced performance in preamble-based MIMO-FBMC systems.
Highlights
Filterbank multicarrier systems employing offset quadrature amplitude modulation (OQAM [1]), called FBMC/OQAM or FBMC, have attracted significant research attention in recent years [2], [3]
The contributions of this paper are twofold: Firstly, we propose real-valued sequences which can be applied as non-zero frequency-domain preambles in MIMO-FBMC systems
NUMERICAL SIMULATIONS FOR CHANNEL ESTIMATION PERFORMANCE we evaluate the performance of the proposed real-valued orthogonal training sequences channel estimation with regard to the channel estimation mean-squared error (MSE) and bit error rate (BER)
Summary
Filterbank multicarrier systems employing offset quadrature amplitude modulation (OQAM [1]), called FBMC/OQAM or FBMC, have attracted significant research attention in recent years [2], [3]. J. Zhang et al.: Real-Valued Orthogonal Sequences for Iterative Channel Estimation in MIMO-FBMC Systems (compared to the maximum channel delay spread), has been proposed in [12]. The contributions of this paper are twofold: Firstly, we propose real-valued sequences which can be applied as non-zero frequency-domain preambles in MIMO-FBMC systems. These preamble sequences display ZCZ property in the time-domain and lead to minimum mean-squared error (MSE) under least square estimator [32]–[35]. =(p,q) where Hmk,,in denotes the channel frequency response from the i-th transmitting antenna to the k-th receiving antenna, and ηmk ,n denotes the corresponding noise component in the k-th receiving antenna
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