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Hardware testbeds are an essential tool to evaluate the performance of multiple-input multiple-output (MIMO) systems in a realistic environment. However, most of the existing MIMO transmission testbeds have been conducted under less than or equal to four antennas. An 8×8 field programmable gate arrays (FGPA)-based MIMO-orthogonal frequency division multiplexing (OFDM) real-time transmission testbed...
Focusing on high order multiple-input multiple-output (MIMO) broadcast systems, this paper presents an efficient group competition-based user selection (GCUS) algorithm for multiuser beamforming. Motivated by the fact that the best user who has the strongest channel gain can not be guaranteed to be selected as one member of the optimal user set, in this paper, we treat the good users who have the...
In 3GPP long term evolution (LTE) uplink, single transmit antenna is adopted due to its simplicity and acceptable performance. However, in order to satisfy the higher requirement of LTE-Advanced (LTE-A) on uplink spectrum efficiency, multiple transmit antennas must be supported in LTE-A uplink. At the same time, the backwards compatibility to LTE should be taken into considerations. Therefore, the...
Focusing on high order multiple-input multiple-output (MIMO) systems, this paper presents an orthogonal grouping-based near optimal detection algorithm (OGNO). Compared to existing detection algorithms, the proposed algorithm provides a new viewpoint of reducing the receiver detection complexity in high order MIMO systems. With the proper parameters, the OGNO can achieve the almost same performance...
This paper proposes a codebook based limited feedback zero-forcing(ZF) precoding scheme for multi-user multiple-input multiple-output (MIMO) downlink channels. In such system, each user needs to calculate a channel directional index (CDI) and a channel quality indicator (CQI), feedback them to the base station (BS). BS selects the set of active users, and calculates transmit beams through zero forcing...
This paper proposes a multiple-access (MA) radio-resource-allocation (RRA) scheme under realistic constraints: dynamic space-frequency-division multiple-access (DSFDMA), which is characterized by collectively and simultaneously considering the bandwidth assignment (subcarrier-clustering), power-allocation, beamforming vectors and user's data-transmission-latency requirement. This scheme optimizes...
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