公开(公告)号：US07542514B2

公开(公告)日：2009-06-02

申请号：US10875689

申请日：2004-06-25

申请人： Pengpeng Song ,  Liyu Cai ,  Yan Wan

发明人： Pengpeng Song ,  Liyu Cai ,  Yan Wan

IPC分类号： H04K1/10

CPC分类号： H04L1/0019 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/20 ,  H04L27/2608

摘要： The present invention discloses a method and device for adaptive modulation and coding based on second order statistics of channel information in OFDM system, characterized in that, by means of variance of Signal-to-Noise ratio (SNR) an appropriate adaptation time window is selected dynamically to trace time-varying channel better; and in that a decision criterion of second order, namely selecting an appropriate modulation and coding schemes (MCS) according to average value of SNR and variance of SNR, is employed to obtain accurate mapping from SNR to MCS. The mapping enhances practicability of the adaptive modulation and coding, decreases probability of system outage, and thus results in better performance of bit error rate.

摘要翻译： 本发明公开了一种基于OFDM系统中信道信息二阶统计的自适应调制编码方法和装置，其特征在于，通过信噪比（SNR）方差，选择适当的适应时间窗 动态跟踪时变频道更好; 并且采用二阶决策标准，即根据SNR的平均值和SNR的方差来选择适当的调制和编码方案（MCS），以获得从SNR到MCS的精确映射。 该映射增强了自适应调制和编码的实用性，降低了系统中断的概率，从而导致更好的比特误码率性能。

公开(公告)号：US07652977B2

公开(公告)日：2010-01-26

申请号：US10884969

申请日：2004-07-07

申请人： Yan Wan ,  Liyu Cai ,  Pengpeng Song

发明人： Yan Wan ,  Liyu Cai ,  Pengpeng Song

IPC分类号： H04J11/00

CPC分类号： H04L1/1816 ,  H04L1/1845 ,  H04L27/2647

摘要： The present invention provides a HARQ (Hybrid Automatic Repeat Request) combining method in an OFDM (Orthogonal Frequency Division Multiplexing) system, which adopts improved Chase combining method weighted by SNR and variance of SNR to realize HARQ combining. The method can improve system performance in processing power and time delay, particularly in low SNR environment, and will not make the system more complex.

摘要翻译： 本发明提供了OFDM（Orthogonal Frequency Division Multiplexing，正交频分复用）系统中的HARQ（Hybrid Automatic Repeat Request，混合自动重传请求）组合方法，采用SNR加权和SNR方差改进的Chase组合方式实现HARQ组合。 该方法可以提高处理能力和时延的系统性能，特别是在低SNR环境下，不会使系统更加复杂。

公开(公告)号：US20050135253A1

公开(公告)日：2005-06-23

申请号：US11002286

申请日：2004-12-03

申请人： Liyu Cai ,  Yan Wan ,  Pengpeng Song

发明人： Liyu Cai ,  Yan Wan ,  Pengpeng Song

IPC分类号： H04L1/16 ,  H04J1/02 ,  H04J11/00 ,  H04L1/00 ,  H04L1/18 ,  H04L12/26 ,  H04L27/26 ,  H04L29/02

CPC分类号： H04L1/1812 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0021 ,  H04L1/0071 ,  H04L1/16 ,  H04L1/1845 ,  H04L5/0007 ,  H04L5/0046 ,  H04L5/006

摘要： The present invention provides a data transmitting method with hybrid automatic repeat request in multi-carrier system. In this method, the signal-to-noise ratios of respective sub-carriers are compared with a threshold, the data on the sub-carriers having the signal-to-noise ratios lower than the threshold are selectively retransmitted by mapping these data onto the sub-carriers having the good channel conditions, and then the retransmitted data are combined hybrid-automatically in the receiver of the opposite terminal. By using the method the system throughput can be enhanced effectively without impairing the bit error rate of the system.

摘要翻译： 本发明提供一种在多载波系统中具有混合自动重传请求的数据发送方法。 在这种方法中，将各个子载波的信噪比与阈值进行比较，通过将这些数据映射到该信号上来选择性地重传具有低于阈值的信噪比的子载波上的数据 具有良好信道条件的子载波，然后重传的数据在对端的接收机中自动混合。 通过使用该方法，可以有效地提高系统吞吐量，而不会损害系统的误码率。

公开(公告)号：US20050007948A1

公开(公告)日：2005-01-13

申请号：US10884969

申请日：2004-07-07

申请人： Yan Wan ,  Liyu Cai ,  Pengpeng Song

发明人： Yan Wan ,  Liyu Cai ,  Pengpeng Song

IPC分类号： H04L1/18 ,  H04L27/26 ,  H04J11/00

CPC分类号： H04L1/1816 ,  H04L1/1845 ,  H04L27/2647

摘要： The present invention provides a HARQ (Hybrid Automatic Repeat Request) combining method in an OFDM (Orthogonal Frequency Division Multiplexing) system, which adopts improved Chase combining method weighted by SNR and variance of SNR to realize HARQ combining. The method can improve system performance in processing power and time delay, particularly in low SNR environment, and will not make the system more complex.

摘要翻译： 本发明提供了OFDM（Orthogonal Frequency Division Multiplexing，正交频分复用）系统中的HARQ（Hybrid Automatic Repeat Request，混合自动重传请求）组合方法，采用SNR加权和SNR方差改进的Chase组合方式实现HARQ组合。 该方法可以提高处理能力和时延的系统性能，特别是在低SNR环境下，不会使系统更加复杂。

公开(公告)号：US07864745B2

公开(公告)日：2011-01-04

申请号：US11002286

申请日：2004-12-03

申请人： Liyu Cai ,  Yan Wan ,  Pengpeng Song

发明人： Liyu Cai ,  Yan Wan ,  Pengpeng Song

IPC分类号： H04J1/00

CPC分类号： H04L1/1812 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0021 ,  H04L1/0071 ,  H04L1/16 ,  H04L1/1845 ,  H04L5/0007 ,  H04L5/0046 ,  H04L5/006

摘要： The present invention provides a data transmitting method with hybrid automatic repeat request in multi-carrier system. In this method, the signal-to-noise ratios of respective sub-carriers are compared with a threshold, the data on the sub-carriers having the signal-to-noise ratios lower than the threshold are selectively retransmitted by mapping these data onto the sub-carriers having the good channel conditions, and then the retransmitted data are combined hybrid-automatically in the receiver of the opposite terminal. By using the method the system throughput can be enhanced effectively without impairing the bit error rate of the system.

摘要翻译： 本发明提供一种在多载波系统中具有混合自动重传请求的数据发送方法。 在这种方法中，将各个子载波的信噪比与阈值进行比较，通过将这些数据映射到该信号上来选择性地重传具有低于阈值的信噪比的子载波上的数据 具有良好信道条件的子载波，然后重传的数据在对端的接收机中自动混合。 通过使用该方法，可以有效地提高系统吞吐量，而不会损害系统的误码率。

公开(公告)号：US08238307B2

公开(公告)日：2012-08-07

申请号：US12674092

申请日：2008-08-13

申请人： Hongwei Yang ,  Liyu Cai ,  Keying Wu ,  Dong Li

发明人： Hongwei Yang ,  Liyu Cai ,  Keying Wu ,  Dong Li

IPC分类号： H04W4/00 ,  H04W36/00 ,  H04J1/00

CPC分类号： H04B7/022 ,  H04B7/0413

摘要： A Macro-Diversity HandOver (MDHO) solution based on multi-User MIMO is provided. Multiple base stations (BSs) serve the MDHO zone. By jointly precoding the modulated signals to be sent, the multiple BSs send the precoded signals to the multiple mobile stations (MSs) over the same time-frequency resources. The signal to be sent is transmitted to the multiple MSs in the MDHO zone. Due to the adoption of the precoding technique, each MS makes no or small interference to other MSs. Since the multiple BSs that serve one MDHO zone serve multiple MSs over the same time-frequency resources, the system capacity in the MDHO zone is greatly improved.

摘要翻译： 提供了一种基于多用户MIMO的宏分集切换（MDHO）解决方案。 多个基站（BS）服务于MDHO区域。 通过联合预编码要发送的调制信号，多个BS通过相同的时间 - 频率资源向多个移动站（MS）发送预编码的信号。 要发送的信号被发送到MDHO区域中的多个MS。 由于采用了预编码技术，每个MS对其他MS没有任何或小的干扰。 由于服务于一个MDHO区域的多个BS在相同的时间 - 频率资源上服务于多个MS，所以MDHO区域中的系统容量大大提高。

公开(公告)号：US20070093273A1

公开(公告)日：2007-04-26

申请号：US11546315

申请日：2006-10-12

申请人： Liyu Cai

发明人： Liyu Cai

IPC分类号： H04M1/00

CPC分类号： H04B7/0452 ,  H04B7/022 ,  H04B7/0669 ,  H04B7/068

摘要： The present invention discloses a distributed base station serving mobile stations, which comprises multiple antenna-RF processing units and a central processing unit remotely connected with said multiple antenna-RF processing units. Each of the antenna-RF processing units has an antenna array formed by multiple antennas. Said central processing unit comprises: an MIMO coding unit for MIMO coding of data of each of the mobile stations so that data of each of the mobile stations generates multi-path data symbols; a beam-forming unit for multiplying each path data symbol of the multi-path data symbols of each of the mobile stations by a weighted coefficient vector corresponding to this path data symbol, to obtain beam-forming data of each path data symbol of each of the mobile stations; and an overlapping unit for, with respect to each antenna in said antenna-RF processing units, overlapping beam-forming data of the respective mobile stations for this antenna and feeding the overlapped beam-forming data to this antenna for transmission. The present invention further discloses a communication system having the above distributed base station and the corresponding signal transmission method.

摘要翻译： 本发明公开了一种服务于移动站的分布式基站，包括多个天线RF处理单元和与所述多个天线RF处理单元远程连接的中央处理单元。 每个天线RF处理单元具有由多个天线形成的天线阵列。 所述中央处理单元包括：MIMO编码单元，用于对每个移动台的数据进行MIMO编码，使得每个移动站的数据产生多路数据符号; 波束形成单元，用于将每个移动站的多路径数据符号的每个路径数据符号乘以与该路径数据符号相对应的加权系数向量，以获得每个路径数据符号的每个路径数据符号的波束形成数据 移动台; 以及相对于所述天线RF处理单元中的每个天线，用于该天线的各个移动台的重叠波束形成数据并将重叠的波束形成数据馈送到该天线以进行传输的重叠单元。 本发明还公开了一种具有上述分布式基站和对应的信号传输方法的通信系统。

公开(公告)号：US08867477B2

公开(公告)日：2014-10-21

申请号：US12674238

申请日：2008-08-06

申请人： Yang Song ,  Liyu Cai

发明人： Yang Song ,  Liyu Cai

IPC分类号： H04W72/04 ,  H04W72/12 ,  H04W28/04 ,  H04W48/20 ,  H04W48/16

CPC分类号： H04W72/1231 ,  H04B7/0632 ,  H04W28/04 ,  H04W48/16 ,  H04W48/20

摘要： In a wireless network there is a scheduling method in which a base station (BS) acquires information relevant to signal quality between the BS and each mobile terminal and reports to a scheduling apparatus. The scheduling apparatus selects a service BS for each terminal and determines a specific BS to compensate for interference; and may provide further controls to correspondingly transmit service data of the terminal to the service BS. The BS determines the serviced terminal and the terminal of which the interference is eliminated. When servicing the terminal on a time-frequency resource and eliminating the interference from other BS, the BS may only acquire channel state information of the terminal associated with the BS to the BS on the corresponding time-frequency resource and calculate a pre-coded matrix, so as to pre-code terminal service data from the service BS and generate downlink signals to be transmitted.

摘要翻译： 在无线网络中，存在一种调度方法，其中基站（BS）获取与BS与每个移动终端之间的信号质量相关的信息，并向调度设备报告。 调度设备为每个终端选择业务BS，并确定特定BS以补偿干扰; 并且可以提供进一步的控制以将终端的服务数据相应地传送到服务BS。 BS确定服务终端和消除干扰的终端。 当在时间频率资源上为终端服务并且消除来自其他BS的干扰时，BS可以仅在对应的时间 - 频率资源上向BS获取与BS相关联的终端的信道状态信息，并且计算预编码矩阵 ，以便从服务BS预编码终端服务数据并产生要发送的下行链路信号。

公开(公告)号：US08248909B2

公开(公告)日：2012-08-21

申请号：US12296841

申请日：2007-04-09

申请人： Dong Li ,  Guosong Li ,  Xialong Zhu ,  Hongwei Yang ,  Liyu Cai

发明人： Dong Li ,  Guosong Li ,  Xialong Zhu ,  Hongwei Yang ,  Liyu Cai

IPC分类号： H04J11/00

CPC分类号： H04L25/03159 ,  H04L1/0606 ,  H04L1/0625 ,  H04L1/0668 ,  H04L5/0042 ,  H04L5/0044 ,  H04L5/0046 ,  H04L27/2605 ,  H04L27/261 ,  H04L27/2636

摘要： A method and device for the baseband process of space-time/space-frequency/spatial diversity transmitter in the SC-FDMA system, the device is characterized in that: 1) an encoding means is connected to the output end of the M-point DFT module; 2) a space-time encoding means, for encoding the corresponding symbol of at least two adjacent symbol sets, and outputting at least two data sets; each sub-carrier mapping means maps respectively each data set to the corresponding antenna, so that the mapped data satisfy the requirements: The symbols mapped on each antenna keep the same sequence as the M symbols outputted by the M-point DFT module; the mapped symbols keep the same sub-carrier interval; the M data of each mapped SC-FDMA symbol are the M outputted data of the DFT module, or the inverse of the M outputted data, or the complex conjugate of the M outputted data, or the inverse complex conjugate of the M outputted data. The present invention implements effective space diversity, reduces PAPR, and makes frequency domain equalization feasible.

摘要翻译： 一种用于SC-FDMA系统中的时空/空频/空间分集发射机基带处理的方法和装置，其特征在于：1）编码装置连接到M点的输出端 DFT模块; 2）空时编码装置，用于编码至少两个相邻符号集的对应符号，并输出至少两个数据集; 每个子载波映射装置分别将每个数据集映射到相应的天线，使得映射的数据满足要求：映射在每个天线上的符号保持与M点DFT模块输出的M个符号相同的序列; 映射的符号保持相同的子载波间隔; 每个映射的SC-FDMA符号的M数据是DFT模块的M个输出数据，或M个输出数据的逆，或M个输出数据的复共轭，或M个输出数据的反复共轭。 本发明实现有效的空间分集，减少PAPR，使得频域均衡成为可能。

公开(公告)号：US20120052896A1

公开(公告)日：2012-03-01

申请号：US13266724

申请日：2009-04-28

申请人： Dong Li ,  Liyu Cai

发明人： Dong Li ,  Liyu Cai

IPC分类号： H04W28/18

CPC分类号： H04B7/0413 ,  H04B7/0669 ,  H04L5/0032

摘要： A mobile communication method, a base station and a mobile communication system employing a hierarchical virtual antenna architecture are disclosed. The method comprises steps of: negotiating, by a first base station, with a second base station about a transmission mode with a mobile station; and according to the negotiated transmission mode, negotiating, by the first base station, with the second base station about respective demodulation reference signal frequency pattern allocation and measurement reference signal frequency pattern allocation in the hierarchical virtual antenna architecture. The flexible and effective reference signals may be realized in various multi-cell Multiple-Input Multiple-Output (MIMO) operation modes by the method.

摘要翻译： 公开了一种采用分层虚拟天线架构的移动通信方法，基站和移动通信系统。 该方法包括以下步骤：由第一基站与移动台协商关于传输模式的第二基站; 并且根据协商的传输模式，由第一基站与第二基站协商关于分层虚拟天线架构中的各个解调参考信号频率模式分配和测量参考信号频率模式分配。 可以通过该方法在各种多小区多输入多输出（MIMO）操作模式中实现灵活和有效的参考信号。