Patent
Codebook design and structure for multi-granular feedback
Mihai Enescu,Timo Roman,Tommi Koivisto,Timo Erkki Lunttila,Shuang Tan,Helka-Liina Maattanen,Kari Pietikainen +6 more
TLDR
In this article, a first precoding matrix W1 is selected from a first codebook comprising sets of rank specific precoding matrices, such that the selected first and second matrix form a joint precoder specific to a desired rank.Abstract:
A first precoding matrix W1 is selected from a first codebook comprising sets of rank specific precoding matrices. The first codebook is characterized by there being fewer precoding matrices associated with higher ranks than associated with lower ranks, and characterized by precoding matrices associated with ranks above a certain rank all being diagonal matrices. The selected first precoding matrix W1 is used to select a rank-specific second precoding matrix W2 from a second codebook, such that the selected first and second precoding matrices form a joint precoder specific to a desired rank. The second codebook is characterized by differently sized precoding matrices associated with each of N total ranks, in which N is an integer greater than one. Information on the joint precoder is reported to a network node over an uplink transmission channel.read more
Citations
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Patent
Method and apparatus for antenna array channel feedback
TL;DR: In this article, the precoding matrix can have a representation in terms of three components, i.e., the first component of the three components can be determined from a first set of vectors, the second component from a set of vector vectors, and the third component from the third vector vectors.
Patent
Method and device for reporting channel state information in wireless communication system
TL;DR: In this article, a method of reporting channel state information (CSI) on a terminal in which a plurality of CSI processes are configured in a wireless communication system according to an embodiment of the present invention includes: measuring a channel based on a CSI reference signal (RS) resource related to one of the CSI processes; measuring interference based on CSI-interference measurement (IM) resources related to the CSI process; determining CSI based on the measured channel and the measured interference; and reporting the CSI through an uplink channel.
Patent
Hierarchical channel sounding and channel state information feedback in massive mimo systems
TL;DR: In this article, the time, frequency and spatial processing parameters for communications between a base station and a mobile station are selected by transmitting synchronization signals in multiple slices of a wireless transmission sector for the base station, and receiving feedback from the mobile station of at least one preferred slice of the multiple slices.
Patent
Method and apparatus for transmitting channel state information in wireless communication system
Hyungtae Kim,Park Hanjun +1 more
TL;DR: In this paper, a method and an apparatus for transmitting periodic channel state information (CSI) in a wireless communication system is presented, where user equipment activates an uplink (UP) semi-persistent scheduling (SPS) session allocated to a secondary cell (SCell), periodically transmits the periodic CSI through a physical uplink shared channel (PUSCH) to a base station on the basis of the UL SPS sessions allocated to the SCell, and releases the UL-SPS session allocating to the secondary cell.
Patent
Method and apparatus for transmitting and receiving feedback information in mobile communication system using multiple antennas
TL;DR: In this article, a method and an apparatus for transmitting/receiving feedback in a mobile communication system are provided, which includes transmitting configuration information on a plurality of reference signals including a first reference signal and a second reference signal to a UE.
References
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Patent
Structured codebook and successive beamforming for multiple-antenna systems
TL;DR: A quantized multi-rank beamforming scheme for multiple-antenna systems such as a multiple-input-multiple-output (MIMO) wireless downlink was proposed in this paper.
Patent
Method for reducing feedback information overhead in precoded mimo-ofdm systems
TL;DR: In this article, an improved method for reducing an amount of precoding feedback information in a multi-carrier MIMO (Multiple Input Multiple Output) communication system using precoding is disclosed.
Patent
Method for pre-encoding multi-input multi-output transmission and codebook encoding
TL;DR: In this article, a method for multi-input multi-output transmission for precoding is proposed, which comprises the following steps: a fundamental matrix is selected, a column vector is selected from the fundamental matrix according to the dimension of a precoding matrix under each rank, the prec coding matrixes are combined into codebooks, and the codebooks are respectively stored into the transmitting end and the receiving end.
Patent
Precoding code book constructing method and precoding code book constructing device of multi-input multi-output system
TL;DR: In this article, a precoding code book constructing method of a multi-input multi-output (MIMO) system is presented. But the method is not suitable for multiuser MIMO systems.
Patent
Apparatus for generating precoding matrix codebook for mimo system and method of the same
TL;DR: In this article, a vector-based codebook for precoding of a multiple-input multiple-output (MIMO) communication scheme is proposed. But the codebook is based on a matrix group generator, which is used to generate a first group of unitary matrices.