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A reconfigurable full-metal-rimmed MIMO antenna is designed and proposed for WWAN/LTE smartphones. This antenna consists of two centro-symmetrically distributed antenna elements and radiation structures using the unbroken metal rim in plastic casing. It can achieve a good isolation of more than 17dB over the entire operation bands. Each antenna element occupies a small ground area of $30\times 6$ ...
This paper reports a novel design and system performance evaluation of 3D MIMO under LTE-A framework based on 3GPP FD MIMO channel model.We exhibit a creative design of centralized configuration for data processing convenience on BS side considering massive MIMO antenna structure, we also present analysis of three main risks on 3D massive MIMO demonstrator design, including time synchronization, channel...
In this paper, we propose an adaptive differential phase control codebook for limited feedback system in slowly time varying channels. In limited feedback system, channel state information is quantized with a given codebook. The spherical cap can be considered as the coverage of a given codebook where the overall channel space is multi-dimensional sphere. By changing the spherical cap radius properly...
We propose an adaptive scheme of a differential codebook for temporally correlated channels. The codeword entries of the proposed codebook are selected among the set of M-PSK constellations and the values of M proposed in this paper are 8, 16, or 32. Firstly, we analyze mathematically how the optimal spherical cap radius of the proposed codebook is tracked. Then, we explain how to implement the proposed...
A differential equal gain transmission (DEGT) scheme is proposed for limited feedback systems. The DEGT scheme not only utilizes the temporal correlation of wireless channels but also has per-antenna equal gain property. The proposed scheme generates a small amount of perturbation and add it to the previously determined precoder. Thereby, the transmitted signals have inherent low PAPR comparing with...
The long term evolution (LTE) standard for uplink transmission is based on single carrier frequency division multiple access (SC-FDMA) maintaining low peak-to-average power ratio (PAPR), which is very valuable for the practical handset design. Recently the usage of codebook-based precoding has been thoroughly discussed for the LTE-Advanced (LTE-A) uplink. Among the various precoding schemes, equal...
A simple, effective, fast codebook index searching algorithm for quantized equal gain transmission (QEGT) in MIMO systems is presented. Rough searching based on the newly defined metric selects a few candidates, then, accurate searching based on the conventional method determines the optimal one. This strategy reduces the overall searching time, while maintaining almost the same link-level performance...
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