Patent
Multi-antenna transmission method and system
TLDR
In this paper, a method and system for transmitting a transmission signal from an antenna array to a receiving means of a wireless communication system, wherein a signal quality measurement is performed at the receiving means (20) for predetermined antennas or beams of said antenna array (19) are selected.Abstract:
The present invention relates to a method and system for transmitting a transmission signal from an antenna array (19) to a receiving means (20) of a wireless communication system, wherein a signal quality measurement is performed at the receiving means (20) for predetermined antennas or beams of said antenna array (19). Based on a feedback information derived from the signal quality measurement, at least two of the predetermined antennas or beams of the antenna array (19) are selected. The selected antennas or beams are used for transmitting said transmission signal according to a transmit diversity or beamforming scheme. Thus, spectral efficiency and diversity gain can be enhanced by using only selected ones of the predetermined antennas or beams.read more
Citations
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Patent
MIMO WLAN system
TL;DR: In this article, a multiple-access MIMO WLAN system that employs MIMI, OFDM, and TDD was proposed, which employs a channel structure with a number of configurable transport channels, supports multiple rates and transmission modes, which are configurable based on channel conditions and user terminal capabilities.
Patent
MIMO system with multiple spatial multiplexing modes
TL;DR: In this article, a MIMO system supports multiple spatial multiplexing modes for improved performance and greater flexibility, which may include (1) a single-user steered mode that transmits multiple data streams on orthogonal spatial channels to a single receiver, (2) a multi-user non-steered mode that transmissions from multiple antennas to multiple receivers without spatial processing at a transmitter, and (3) a multiuser steered and non-stacked mode that simultaneously transmits data streams from multiple receivers to multiple users.
Patent
Transmit diversity method and system
Ari Hottinen,Risto Wichman +1 more
TL;DR: In this article, the authors proposed a transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, wherein a transmission signal is transmitted from the transmitting element to the at least receiver in accordance with a weight information determined in response to a feedback information, and is fed back using multiplexed feedback signals.
Patent
Pilots for mimo communication systems
TL;DR: In this article, the various types of pilot include beacon pilot, MIMO pilot, carrier pilot, steered reference or steered pilot, and steered reference may be used for channel estimation.
Journal ArticleDOI
A hybrid adaptive antenna array
TL;DR: A novel hybrid adaptive antenna array which consists of analogue subarrays followed by a digital beamformer is presented in this paper to overcome the digital implementation difficulty.
References
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Patent
Transmit diversity method and system
Ari Hottinen,Risto Wichman +1 more
TL;DR: In this article, the authors proposed a transmit diversity method for a wireless communication system comprising a transmitting element and at least one receiver, wherein a transmission signal is transmitted from the transmitting element to the at least receiver in accordance with a weight information determined in response to a feedback information, and is fed back using multiplexed feedback signals.
Patent
Space time transmit diversity for tdd/wcdma systems
TL;DR: In this paper, a matched filter circuit with a plurality of fingers coupled to receive a data symbol is designed. And a joint detector circuit is coupled to each respective output signal from the plurality of decoder circuits.
Patent
Apparatus and method for controlling transmit antenna array for physical downlink shared channel in a mobile communication system
Sung-Jin Kim,Young-Suk Lee,Sung-Ho Choi,Hyun-Woo Lee,Sung-Oh Hwang,Byung-Jae Kwak,Yong-Jun Kwak,Sang-Hwan Park +7 more
TL;DR: In this paper, if a UE enters a SHO (Soft Handover) region, the UE determines weight information for a DPCH and a PDSCH depending on the feedback information received from the UE.
Patent
Apparatus and method for providing closed-loop transmit antenna diversity in a mobile communication system
TL;DR: In this article, an apparatus and method for providing closed-loop transmit antenna diversity in a mobile communication system is provided. And the authors propose an algorithm to maximize the sum of the vectors of signals received from at least two antennas at a base station, by calculating differential vectors for the input signal vectors, and transmits information about the calculated differential vectors to the base station.
Patent
Method and apparatus for improving capacity in a radio communications system
TL;DR: In this article, a method of improving capacity in a duplexing scheme is provided, which comprises the steps of determining an amount of available capacity on the first band of frequencies (steps 402, 404, 410, 410), transmitting a variable amount of feedback data corresponding to the available capacity, the feedback data comprising data for improving the quality of communications on the second band of frequency, and optimizing (steps 406, 408, 412, 414, 414) transmissions on the 2.5 GHz band.