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1. 发明申请

US20180062896A1 Scattered Pilot Pattern And Channel Estimation Method For MIMO-OFDM Systems 审中-公开
公开(公告)号：US20180062896A1
公开(公告)日：2018-03-01
申请号：US15694664
申请日：2017-09-01
申请人： BlackBerry Limited
发明人： Peiying Zhu , Wen Tong , Jianglei MA , Ming Jia
IPC分类号： H04L27/26 , H04W52/42 , H04L25/02 , H04B7/04 , H04L5/00 , H04L1/06 , H04B7/06
CPC分类号： H04L27/2613 , H04B7/04 , H04B7/0413 , H04B7/0684 , H04L1/0618 , H04L5/0023 , H04L5/0048 , H04L25/0204 , H04L25/022 , H04L25/0234 , H04L25/0244 , H04L27/2602 , H04L27/2627 , H04W52/42
摘要： A method and apparatus are provided for reducing the number of pilot symbols within a MIMO-OFDM communication system, and for improving channel estimation within such a system. For each transmitting antenna in an OFDM transmitter, pilot symbols are encoded so as to be unique to the transmitting antenna. The encoded pilot symbols are then inserted into an OFDM frame to form a diamond lattice, the diamond lattices for the different transmitting antennae using the same frequencies but being offset from each other by a single symbol in the time domain. At the OFDM receiver, a channel response is estimated for a symbol central to each diamond of the diamond lattice using a two-dimensional interpolation. The estimated channel responses are smoothed in the frequency domain. The channel responses of remaining symbols are then estimated by interpolation in the frequency domain.

2. 发明申请

US20200304174A1 Multi-Site Mimo Cooperation In Cellular Networks 审中-公开
公开(公告)号：US20200304174A1
公开(公告)日：2020-09-24
申请号：US16841326
申请日：2020-04-06
申请人： BlackBerry Limited
发明人： Mohammadhadi BALIGH , Jianglei MA , Hua XU
IPC分类号： H04B7/024 , H04L1/00 , H04L1/06 , H04L5/00
摘要： A method of serving a given data stream to a target mobile terminal, in a cellular communications network that includes a plurality of transmitting sites wherein each transmitting site including at least one antenna, is provided. The method includes designating at least two of the plurality of transmitting sites as cooperating sites; assigning tones to each transmitting site from a sub-band associated with the cooperating sites; dividing the data stream into at least two sub-data streams, each of the sub-data streams for transmission over selected tones; and interlacing tones of the cooperating sites in accordance with a selected one of a time switching and a frequency switching transmit diversity technique. Other techniques for multi-site MIMO cooperation are also provided.

3. 发明申请

US20140314183A1 Scattered Pilot Pattern And Channel Estimation Method For MIMO-OFDM Systems 有权
标题翻译：用于MIMO-OFDM系统的分散导频模式和信道估计方法
公开(公告)号：US20140314183A1
公开(公告)日：2014-10-23
申请号：US14249127
申请日：2014-04-09
申请人： BlackBerry Limited
发明人： Peiying Zhu , Wen Tong , Jianglei MA , Ming Jia
IPC分类号： H04L27/26 , H04B7/04
CPC分类号： H04L27/2613 , H04B7/04 , H04B7/0413 , H04B7/0684 , H04L1/0618 , H04L5/0023 , H04L5/0048 , H04L25/0204 , H04L25/022 , H04L25/0234 , H04L25/0244 , H04L27/2602 , H04L27/2627 , H04W52/42
摘要： A method and apparatus are provided for reducing the number of pilot symbols within a MIMO-OFDM communication system, and for improving channel estimation within such a system. For each transmitting antenna in an OFDM transmitter, pilot symbols are encoded so as to be unique to the transmitting antenna. The encoded pilot symbols are then inserted into an OFDM frame to form a diamond lattice, the diamond lattices for the different transmitting antennae using the same frequencies but being offset from each other by a single symbol in the time domain. At the OFDM receiver, a channel response is estimated for a symbol central to each diamond of the diamond lattice using a two-dimensional interpolation. The estimated channel responses are smoothed in the frequency domain. The channel responses of remaining symbols are then estimated by interpolation in the frequency domain.
摘要翻译：提供了一种用于减少MIMO-OFDM通信系统内的导频符号的数量并改善这种系统内的信道估计的方法和装置。对于OFDM发射机中的每个发射天线，导频符号被编码为对于发射天线是唯一的。然后将编码的导频符号插入到OFDM帧中以形成菱形晶格，使用相同频率的不同发射天线的菱形晶格，但是在时域中通过单个符号彼此偏移。在OFDM接收机处，使用二维插值来估计针对钻石晶格的每个菱形的中心的符号的信道响应。估计的信道响应在频域中被平滑化。然后通过在频域中的内插来估计剩余符号的信道响应。

4. 发明申请

US20190123949A1 Scattered Pilot Pattern And Channel Estimation Method For MIMO-OFDM Systems 审中-公开
公开(公告)号：US20190123949A1
公开(公告)日：2019-04-25
申请号：US16173901
申请日：2018-10-29
申请人： BlackBerry Limited
发明人： Peiying Zhu , Wen Tong , Jianglei MA , Ming Jia
IPC分类号： H04L27/26 , H04W52/42 , H04B7/0413 , H04L25/02 , H04B7/04 , H04L5/00 , H04L1/06 , H04B7/06
摘要： A method and apparatus are provided for reducing the number of pilot symbols within a MIMO-OFDM communication system, and for improving channel estimation within such a system. For each transmitting antenna in an OFDM transmitter, pilot symbols are encoded so as to be unique to the transmitting antenna. The encoded pilot symbols are then inserted into an OFDM frame to form a diamond lattice, the diamond lattices for the different transmitting antennae using the same frequencies but being offset from each other by a single symbol in the time domain. At the OFDM receiver, a channel response is estimated for a symbol central to each diamond of the diamond lattice using a two-dimensional interpolation. The estimated channel responses are smoothed in the frequency domain. The channel responses of remaining symbols are then estimated by interpolation in the frequency domain.

5. 发明申请

US20160226691A1 Scattered Pilot Pattern And Channel Estimation Method For MIMO-OFDM Systems 有权
公开(公告)号：US20160226691A1
公开(公告)日：2016-08-04
申请号：US15080275
申请日：2016-03-24
申请人： BlackBerry Limited
发明人： Peiying Zhu , Wen Tong , Jianglei MA , Ming Jia
IPC分类号： H04L27/26 , H04W52/42 , H04L5/00
CPC分类号： H04L27/2613 , H04B7/04 , H04B7/0413 , H04B7/0684 , H04L1/0618 , H04L5/0023 , H04L5/0048 , H04L25/0204 , H04L25/022 , H04L25/0234 , H04L25/0244 , H04L27/2602 , H04L27/2627 , H04W52/42
摘要： A method and apparatus are provided for reducing the number of pilot symbols within a MIMO-OFDM communication system, and for improving channel estimation within such a system. For each transmitting antenna in an OFDM transmitter, pilot symbols are encoded so as to be unique to the transmitting antenna. The encoded pilot symbols are then inserted into an OFDM frame to form a diamond lattice, the diamond lattices for the different transmitting antennae using the same frequencies but being offset from each other by a single symbol in the time domain. At the OFDM receiver, a channel response is estimated for a symbol central to each diamond of the diamond lattice using a two-dimensional interpolation. The estimated channel responses are smoothed in the frequency domain. The channel responses of remaining symbols are then estimated by interpolation in the frequency domain.

6. 发明申请

US20150341905A1 Detecting the Number of Transmit Antennas in a Base Station 有权
标题翻译：检测基站中发射天线的数量
公开(公告)号：US20150341905A1
公开(公告)日：2015-11-26
申请号：US14817739
申请日：2015-08-04
申请人： BlackBerry Limited
发明人： Aaron CALLARD , Jianglei MA
IPC分类号： H04W72/00 , H04W72/04 , H04B7/06
CPC分类号： H04W72/005 , H04B7/0678 , H04B7/0689 , H04L5/0092 , H04W72/0453
摘要： Data is scrambled at a transmitter according to one of a number of predetermined scrambling sequences which are associated with a particular one of a number of predetermined transmit antenna diversity schemes (i.e., a specific number of transmit antenna ports). Received data is decoded using one or more of the known transmit antenna diversity schemes and the scrambled data is descrambled according to a corresponding descrambling sequence (related to the scrambling sequence). Based on the descrambled data, the receiver determines which transmit antenna diversity scheme (i.e., the number of antenna ports) is used by the transmitter. In one specific embodiment, CRC parity data is scrambled in the transmitter and the receiver descrambles the recovered CRC parity data according to a descrambling sequence, computes CRC parity data from the received data, and compares the descrambled CRC parity data to the newly computed CRC parity data.
摘要翻译：根据与多个预定发射天线分集方案（即，特定数量的发射天线端口）中的特定数量的特定一个相关联的多个预定加扰序列之一，在发射机处对数据进行加扰。使用已知的发射天线分集方案中的一个或多个对接收的数据进行解码，并且根据相应的解扰序列（与加扰序列有关）来对加密的数据进行解扰。基于解扰数据，接收机确定发射机使用哪个发射天线分集方案（即，天线端口的数目）。在一个具体实施例中，CRC奇偶校验数据在发射机中被加扰，并且接收机根据解扰序列对恢复的CRC奇偶校验数据进行解扰，从接收到的数据计算CRC奇偶校验数据，并将解扰的CRC奇偶校验数据与新计算的CRC奇偶校验比较数据。

7. 发明申请

US20150180630A1 Scattered Pilot Pattern And Channel Estimation Method For MIMO-OFDM Systems 有权
标题翻译：用于MIMO-OFDM系统的分散导频模式和信道估计方法
公开(公告)号：US20150180630A1
公开(公告)日：2015-06-25
申请号：US14608497
申请日：2015-01-29
申请人： BlackBerry Limited
发明人： Peiying Zhu , Wen Tong , Jianglei MA , Ming Jia
IPC分类号： H04L5/00 , H04L27/26
CPC分类号： H04L27/2613 , H04B7/04 , H04B7/0413 , H04B7/0684 , H04L1/0618 , H04L5/0023 , H04L5/0048 , H04L25/0204 , H04L25/022 , H04L25/0234 , H04L25/0244 , H04L27/2602 , H04L27/2627 , H04W52/42
摘要： A method and apparatus are provided for reducing the number of pilot symbols within a MIMO-OFDM communication system, and for improving channel estimation within such a system. For each transmitting antenna in an OFDM transmitter, pilot symbols are encoded so as to be unique to the transmitting antenna. The encoded pilot symbols are then inserted into an OFDM frame to form a diamond lattice, the diamond lattices for the different transmitting antennae using the same frequencies but being offset from each other by a single symbol in the time domain. At the OFDM receiver, a channel response is estimated for a symbol central to each diamond of the diamond lattice using a two-dimensional interpolation. The estimated channel responses are smoothed in the frequency domain. The channel responses of remaining symbols are then estimated by interpolation in the frequency domain.
摘要翻译：提供了一种用于减少MIMO-OFDM通信系统内的导频符号的数量并改善这种系统内的信道估计的方法和装置。对于OFDM发射机中的每个发射天线，导频符号被编码为对于发射天线是唯一的。然后将编码的导频符号插入到OFDM帧中以形成菱形晶格，使用相同频率的不同发射天线的菱形晶格，但是在时域中通过单个符号彼此偏移。在OFDM接收机处，使用二维插值来估计针对钻石晶格的每个菱形的中心的符号的信道响应。估计的信道响应在频域中被平滑化。然后通过在频域中的内插来估计剩余符号的信道响应。

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