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In an OFDM-based cooperative relay system, the arrival times and carrier frequency offsets (CFOs) of the signals from different relays are most likely different. Estimation of these timing offsets and CFOs is a crucial and challenging task. In this paper, a new preamble structure is designed, and an efficient time and frequency offset estimator is proposed for the OFDM-based cooperative system. The...
Multi-hop networks have been proposed as a new type of autonomous networks recently. Various multi-hop routings employ flooding mechanisms, where all terminals retransmit a same packet to a whole network to distribute information. It is well known that flooding mechanisms consume a lot of wireless resources. Additionally, broadcast storm problems occur when a number of nodes or traffic increase in...
In this paper, new training sequence structure with adjustable parameters is proposed for the multiple timing offsets and frequency offsets estimation of cooperative device-to-device (D2D) systems underlaying hyper-cellular networks. By using the proposed training sequences, timing offsets can be estimated using a cross-correlation approach with good performance, and frequency offsets can be estimated...
Practical realization of the coherent processing in widely separated multiple-input multiple-output (MIMO) radar systems requires the development of implementable techniques to ensure a common notion of phase among all the distributed radar elements. In this work, we present two effective approaches to achieve phase synchronization in coherent MIMO radar systems. The first one is the master-slave...
Frequency synchronization plays a critical role in acquiring cooperative diversity for cooperative OFDM systems. However, the superposition of different carrier frequency offsets (CFOs) among each relay and destination makes the estimation difficult. In this paper, a novel multiple CFOs estimation algorithm is proposed. With this algorithm, the CFO corresponding to each relay can be accurately estimated...
In this paper, we propose a cooperative communation scheme using multi-symbol encapsulated orthogonal frequency division multiplexing (MSE-OFDM), in which one cyclic prefix (CP) is used for multiple OFDM symbols. We use the FFT size-reduced MSE-OFDM system which can be used to reduce the peak-to-average power ratio (PAPR) and improve the robustness to carrier frequency offset. The cooperative communication...
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