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1. 发明授权

US10044420B2 Closed-loop massive MIMO system architecture 有权
公开(公告)号：US10044420B2
公开(公告)日：2018-08-07
申请号：US15379635
申请日：2016-12-15
申请人： Hong Kong Applied Science and Technology Research Institute Company Limited
发明人： Yuxian Zhang , Man Wai Kwan , Eric Kong Chau Tsang
IPC分类号： H04B7/0417 , H04B7/0456 , H04W72/04 , H04B7/0452 , H04W72/08
CPC分类号： H04B7/0417 , H04B7/0452 , H04B7/0469 , H04B7/0473 , H04B7/0626 , H04B7/10 , H04W72/046 , H04W72/082
摘要： A method for transmitting payload data from a base station (BS) to a user equipment (UE) via a MIMO channel is provided. Channel estimation is performed first and the channel-estimation result is used for optimizing data transmission. Instead of reporting CQI, RI and PMI to the BS, the UE reports a first channel transfer function characterizing an end-to-end process of obtaining received CSI-RS symbols from originally-sent CSI-RS symbols. Computation burden at the UE is reduced as computation of the CQI, RI and PMI is eliminated. At the BS, an effect caused by the antenna port-to-transceiver unit (AP-to-TXRU) virtualization operation is removed from the first channel transfer function to yield a second channel transfer function. With the second channel transfer function closer to the MIMO channel transfer function than the first one, the “content” of the MIMO channel is better utilized in optimizing data-transmission performance.

2. 发明授权

US10063396B2 Method and apparatus of topological pilot decontamination for massive MIMO systems 有权
公开(公告)号：US10063396B2
公开(公告)日：2018-08-28
申请号：US15016283
申请日：2016-02-05
申请人： Hong Kong Applied Science and Technology Research Institute Company Limited
发明人： Yaming Luo , Yuxian Zhang , Man Wai Kwan , Kong Chau Tsang
IPC分类号： H04L25/02 , H04B7/0456
CPC分类号： H04L25/0256 , H04B7/0413 , H04B7/0456 , H04L25/0204 , H04L25/0228 , H04L25/0242
摘要： The presently claimed invention relates generally to a method and an apparatus for pilot decontamination for massive MIMO system and, more particularly, to a massive MIMO communication system based on channel estimation with topological interference alignment.

3. 发明授权

US09860861B2 Timing offset estimation in an OFDM-based system by SINR measurement 有权
公开(公告)号：US09860861B2
公开(公告)日：2018-01-02
申请号：US15133237
申请日：2016-04-20
申请人： Hong Kong Applied Science and Technology Research Institute Company Limited
发明人： Yueping Wu , Yin Yang , Man Wai Victor Kwan , Yuxian Zhang , Eric Kong Chau Tsang
IPC分类号： H04W56/00
CPC分类号： H04W56/001 , H04W56/0035
摘要： A method for timing synchronization of an OFDM signal is useful for a sniffing base station (BS) to establish BS synchronization with another BS in a mobile communication system. The method comprises estimating a timing offset of the signal from a reference sampling instant. In estimating the timing offset, first determine a maximum detection range of an estimable timing offset estimated solely by an observed phase difference between two pre-selected pilot symbols in the signal. Then the timing offset is determined as an integer multiple of the maximum detection range plus a residual timing offset. The multiplying integer is determined from a set of candidate integers. According to a candidate integer under consideration, a portion of an OFDM-signal sample sequence is masked out and a resultant signal to interference plus noise ratio (SINR) is computed. The multiplying integer is determined by identifying the candidate integer having the greatest SINR.

4. 发明授权

US09503164B1 Method and apparatus for channel estimation in massive MIMO systems with dynamic training design 有权
标题翻译：用于具有动态训练设计的大规模MIMO系统中信道估计的方法和装置
公开(公告)号：US09503164B1
公开(公告)日：2016-11-22
申请号：US14733964
申请日：2015-06-09
申请人： Hong Kong Applied Science and Technology Research Institute Company Limited
发明人： Yuxian Zhang , Man Wai Victor Kwan , Eric Kong Chau Tsang
IPC分类号： H04B7/04 , H04B17/309 , H04B7/06
CPC分类号： H04B17/309 , H04B7/0413 , H04B7/0691 , H04L25/0202
摘要： This invention is concerned with estimating a massive multi-input multi-output (MIMO) channel. In one embodiment, the transmit antennas are first partitioned into antenna groups each comprising a subset of the transmit antennas such that a pre-determined level of channel-estimation accuracy is attainable. For each antenna group, training signals for estimating a group of channels associated with the antenna group are determined. In particular, the number of the antenna groups, the subset of the transmit antennas for forming the antenna group, and the training signals for the antenna group are determined based on spatial correlations of the massive MIMO channel, a maximum allowable total number of training signals and a transmit signal-to-noise ratio such that the pre-determined level of channel-estimation accuracy is achievable. Advantageously, the number of antenna groups is determined by identifying a highest number of antenna groups under a constraint that the pre-determined level is achievable.
摘要翻译：本发明涉及估计大量多输入多输出（MIMO）信道。在一个实施例中，发射天线首先被划分成天线组，每个天线组包括发射天线的子集，使得可以获得预定的信道估计精度水平。对于每个天线组，确定用于估计与天线组相关联的一组信道的训练信号。特别地，天线组的数量，用于形成天线组的发射天线的子集以及天线组的训练信号基于海量MIMO信道的空间相关性，训练信号的最大允许总数以及发送信噪比，使得可以实现预定的信道估计精度水平。有利地，天线组的数量通过在预定电平可实现的约束下识别最大数量的天线组来确定。

5. 发明授权

US09401824B1 Method and apparatus of channel estimation in multi-user massive MIMO systems 有权
标题翻译：多用户大规模MIMO系统中信道估计的方法和装置
公开(公告)号：US09401824B1
公开(公告)日：2016-07-26
申请号：US14864847
申请日：2015-09-24
申请人： Hong Kong Applied Science and Technology Research Institute Company Limited
发明人： Yuxian Zhang , Man Wai Kwan , Eric Kong Chau Tsang
IPC分类号： H04L1/02 , H04L25/02 , H04B7/04 , H04L5/00
CPC分类号： H04L25/0204 , H04B7/0417 , H04B7/063 , H04B7/0695 , H04L5/0048 , H04L25/021 , H04L25/0226
摘要： The presently claimed invention provides a method of channel estimation in a multi-user massive Multiple-Input Multiple-Output system. Candidate pilots are selected for each user equipment based on their spatial correlation matrices. Through determining the similarity of spatial correlation matrices among different user equipments, shared pilots among them can be found, and a base station can transmit a union set of pilots for channel estimation. The present invention is able to provide high channel estimation accuracy and reduce training signal resource.
摘要翻译：本发明提供一种在多用户海量多输入多输出系统中的信道估计方法。基于其空间相关矩阵为每个用户设备选择候选导频。通过确定不同用户设备之间的空间相关矩阵的相似度，可以发现它们之间的共享导频，并且基站可以发送用于信道估计的导频组合。本发明能够提供高信道估计精度并减少训练信号资源。

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