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The performance of multiuser multiple input multiple output (MIMO) downlink communication system is degraded under the assumption of rapid movement of user terminals with a certain speed. Though several methods have been proposed to improve this situation, they consume extra-degrees of freedom for the extension of the zero forcing (ZF) area and/or heavy computational load for the frequent update of...
This paper provides performance analysis of multiuser multiple input multiple output (MIMO) downlink system based on zero forcing (ZF) assuming communication with moving targets. Under different conditions of antenna number, Doppler frequency, and channel estimation interval, performance of several simple methods which attempt to extend the ZF area based on channel prediction using linear extrapolation...
This paper presents a two-stage design approach of multiple input multiple output (MIMO) downlink multiuser system adopting large array antenna in transmitter side based on block diagonalization method. In the proposed method, in addition to zero-forcing operation by subarrays in the first stage, interference cancellation is executed also in the second stage for the large weight reconstruction, which...
In cellular systems, BSs (base stations) are ideally desired to be located in the center of cells, but it is sometimes impossible because of the physical and/or social restrictions on the BS setting space. This paper considers the influence of the displacement of the BS location on BS cooperation (BSC) scheme in MIMO (multiple input multiple output) cellular system. For this aim, BS locations are...
Conventional MIMO (multiple input multiple output) multiuser systems consider communications between one base station (BS) and multiple user terminals (UTs) both in downlink and uplink scenarios.This paper deals with the case in which multiple BSs transmit different data sequence to different target UTs which becomes a MTMR (multiple transmitter multiple receiver) problem, and describes a maximum...
DSTBC (differential space-time block coding) system does not require CSI (channel state information) in both transmitter and receiver sides, but its SNR (signal to noise ratio) versus BER (bit error rate) characteristic is degraded compared with original STBC scheme which utilizes CSI at the receiver. In this paper, attempting to recover this performance loss originated from the differential decoding,...
We propose an implementation of the tapped delay line adaptive array (TDLAA) at the base station for improving the BER performance of asynchronous multi-user in mobile communication over fast fading channels using multiple antennas. The data in each user at the mobile station, which applies two transmit antennas, are encoded by space time block code (STBC). The proposed scheme transmits the pilot...
A highly integrated quasi-millimeter-wave transmitter MMIC that integrates 26 circuits in a 3 mm times 3 mm area using three-dimensional MMIC (3D-MMIC) technology is presented. The power dissipation of the MMIC is only 0.54 W. It achieved a high P1dB of 6 dBm and gain of 19 dB at 26 GHz. Furthermore, it integrated step attenuators with a new built-in inverter using an N-channel depression FET for...
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