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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...
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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