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3D-MIMO, using two dimensional antenna array at base station, demonstrates promising throughput gain over conventional antenna system during recent academic and industry studies. To realize the performance gain, accurate channel state information (CSI) feedback is one essential aspect. One effective way to obtain this CSI is taking advantage of channel reciprocity between uplink and downlink in TDD...
A fully integrated dual-channel multiband RF receiver is designed and implemented for next-generation global navigation satellite systems (GNSSs) in a 0.18- CMOS process. Its two reconfigurable signal channels can simultaneously process any two types of 2-, 4-, or 20-MHz bandwidth signals mainly located around the RF bands of 1.2 and 1.57 GHz for GPS, Galileo, and BD-2 (aka Compass)...
Coordinated multi-point (CoMP) transmission is a promising technique to suppress inter-cell interference (ICI) in LTE-Advanced system. With perfect channel state information (CSI) at the transmitter, joint beamforming methods can be used to completely cancel ICI and significantly improve the spectrum efficiency. However, in FDD system, the transmitter can't obtain perfect CSI to eliminate ICI, for...
A dual-channel fully integrated RF receiver is designed and implemented for next generation Global Navigation Satellite Systems (GNSS) in a 0.18μm CMOS process. Its two independent channels are capable of receiving 2MHz, 4MHz or 20MHz bandwidth signals around 1.2GHz and 1.57GHz, for GPS, Galileo, and Compass systems. Gain controls along with an all-digital automatic gain control (AGC) loop...
LTE-advanced system which based on orthogonal frequency division multiplexing (OFDM) can eliminate intra-cell interference but still can not mitigate inter-cell interference (ICI). In this paper, we propose a novel cooperative multi-cell multiple-input multiple-output (MIMO) scheme for LTE-advanced system to reduce ICI and improve the cell capacity. By sharing information such as data and channel...
In this paper, we present two closed loop transmit diversity schemes for the systems which have designed closed loop power control scheme where the transmitter has equipped with two antennas and the receiver has one antenna. The proposed schemes do not require any additional feedback bits but utilize only the existing closed loop power control command bit in the system. The two proposed schemes are...
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