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The existing solutions for multi-user detection in uplink (UL) grant-free sparse code multiple access (SCMA) rely on the prior knowledge of user sparsity, i.e., the number of active users. An alternative solution, which sets the sparsity as a statistically empirical value to get a rough active user set and then eliminates the false detected inactive users with joint message passing algorithm (JMPA),...
Navigation enhanced information (NEI) is very important to improve the positioning and navigation performance of GNSS receivers, and the current available NEI mainly come from static station observation data, which don't has enough credibility and area attribute. In this paper, an parallel area navigation enhanced information (ANEI) extraction algorithm based on massive historical GNSS data and MapReduce...
In this paper, we propose an algorithm that determines the optimal user equipment (UE) and base station (BS) association in heterogeneous cellular network, aiming at minimizing network energy consumption and avoiding frequent pico base station (PBS) mode switching, by taking into account the energy consumption of PBS switching-on/off operation. We first formulate the energy minimization problem into...
This paper discusses estimation of the finite impulse response (FIR) for a linear time-invariant (LTI) system. Specifically, we focus on the case where the FIR sequence is sparse and the system model is low-order; the latter is equivalent to that the Hankel matrix constructed from the FIR sequence is low-rank. These two properties motivate us to propose a unified system identification framework, which...
In a mobile relay system, the idle users can be formed as a cluster to support nearby active users. In order to reduce the complexity of the processing in the relay nodes and destination nodes, a novel transmit preprocessing method is proposed for the cluster based multi-user relay system. Block diagonalization (BD) algorithm is adopted twice in the proposed method to remove inter-cluster and intra-cluster...
In this paper, a covariance-based algorithm with multiple antennas is proposed to eliminate the follower jamming for frequency hopping systems (FH) by finding the interference-blocking filter over quasi-static flat fading channels. The system uses the auto-covariance matrix of the received signal and M-array receive antennas. The simulation results show that the proposed approach can estimate the...
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