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1. 发明申请

US20060062283A1 Iterative and turbo-based method and apparatus for equalization of spread-spectrum downlink channels 有权
公开(公告)号：US20060062283A1
公开(公告)日：2006-03-23
申请号：US10943565
申请日：2004-09-17
申请人： Jianzhong Zhang , Hoang Nguyen , Giridhar Mandyam , Joe Dowling
发明人： Jianzhong Zhang , Hoang Nguyen , Giridhar Mandyam , Joe Dowling
IPC分类号： H04B1/707
CPC分类号： H04L1/005 , H04B1/7115 , H04L2025/03509
摘要： A system, terminal, receiver and method are provided for receiving and processing a signal received from a spread-spectrum downlink channel. The method includes receiving the signal from the downlink channel, and generating an estimate of a transmitted chip sequence in accordance with an iterative process. In this regard, the iterative process includes calculating statistical information, such as a mean and covariance, for a previous iteration of a transmitted chip sequence, the statistical information being selectively calculated based upon one of soft bits and soft symbols associated with the previous iteration of the transmitted chip sequence. The estimate for a current iteration of the chip sequence is then generated based upon the statistical information.

2. 发明授权

US07443909B2 Weighted autocorrelation method for downlink CDMA LMMSE equalizers 有权
标题翻译：下行CDMA LMMSE均衡器的加权自相关方法
公开(公告)号：US07443909B2
公开(公告)日：2008-10-28
申请号：US11020055
申请日：2004-12-21
申请人： Hoang Nguyen , Jianzhong Zhang , Yuanbin Guo , Dennis McCain , Joe Dowling
发明人： Hoang Nguyen , Jianzhong Zhang , Yuanbin Guo , Dennis McCain , Joe Dowling
IPC分类号： H04B1/707
CPC分类号： H04B1/71052 , H04B1/71055
摘要： Receiving downlink CDMA signals in a fast-fading environment is facilitated at higher receiver velocities by updating the block-adaptive linear minimum mean square error (LMMSE) downlink CDMA equalizer. The autocorrelation matrix of the observed data is updated by passing block-wise autocorrelation slides through a filter. Each autocorrelation slide is an autocorrelation matrix estimated from a short block of observed data over which the channel can be considered constant. This method achieves a reliable estimate for the autocorrelation matrix when the block size must be small to ensure that the block-wise stationarity assumption holds in cases of fast fading channels. In addition, small block sizes make it possible to satisfy the equalizer delay constraint imposed by hardware and certain voice transmission standards such as CDMA2000 1X where demodulated data must be delivered within only several symbol periods of the signal arrival time.
摘要翻译：通过更新块自适应线性最小均方误差（LMMSE）下行链路CDMA均衡器，在更高的接收机速度下，在快衰落环境中接收下行链路CDMA信号。观察数据的自相关矩阵通过通过滤波器的块自相关滑块来更新。每个自相关幻灯片是从观测数据的短块估计的自相关矩阵，其中信道可以被认为是恒定的。当块大小必须小时，该方法实现了自相关矩阵的可靠估计，以确保在快速衰落信道的情况下保持块状平稳性假设。此外，小块大小使得可以满足由硬件和某些语音传输标准（例如CDMA2000 1X）施加的均衡器延迟约束，其中必须在信号到达时间的几个符号周期内传送解调数据。

3. 发明申请

US20060133462A1 Weighted autocorrelation method for downlink CDMA LMMSE equalizers 有权
标题翻译：下行CDMA LMMSE均衡器的加权自相关方法
公开(公告)号：US20060133462A1
公开(公告)日：2006-06-22
申请号：US11020055
申请日：2004-12-21
申请人： Hoang Nguyen , Jianzhong Zhang , Yuanbin Guo , Dennis McCain , Joe Dowling
发明人： Hoang Nguyen , Jianzhong Zhang , Yuanbin Guo , Dennis McCain , Joe Dowling
IPC分类号： H04B1/707
CPC分类号： H04B1/71052 , H04B1/71055
摘要： Receiving downlink CDMA signals in a fast-fading environment is facilitated at higher receiver velocities by updating the block-adaptive linear minimum mean square error (LMMSE) downlink CDMA equalizer. The autocorrelation matrix of the observed data is updated by passing block-wise autocorrelation slides through a filter. Each autocorrelation slide is an autocorrelation matrix estimated from a short block of observed data over which the channel can be considered constant. This method achieves a reliable estimate for the autocorrelation matrix when the block size must be small to ensure that the block-wise stationarity assumption holds in cases of fast fading channels. In addition, small block sizes make it possible to satisfy the equalizer delay constraint imposed by hardware and certain voice transmission standards such as CDMA2000 1× where demodulated data must be delivered within only several symbol periods of the signal arrival time. Preliminary simulation results obtained under the 1× standard show that the proposed method outperforms the Rake receiver and the ordinary block LMMSE equalizer in the presence of filtering delay. The improvement over the ordinary block LMMSE equalizer is substantial in cases of high mobility.
摘要翻译：通过更新块自适应线性最小均方误差（LMMSE）下行链路CDMA均衡器，在更高的接收机速度下，在快衰落环境中接收下行链路CDMA信号。观察数据的自相关矩阵通过通过滤波器的块自相关滑块来更新。每个自相关幻灯片是从观测数据的短块估计的自相关矩阵，其中信道可以被认为是恒定的。当块大小必须小时，该方法实现了自相关矩阵的可靠估计，以确保在快速衰落信道的情况下保持块状平稳性假设。此外，小块大小使得可以满足由硬件和某些语音传输标准（例如CDMA2000 1x）施加的均衡器延迟约束，其中必须在信号到达时间的几个符号周期内传送解调数据。在1x标准下获得的初步仿真结果表明，所提出的方法在存在滤波延迟的情况下优于Rake接收机和普通块LMMSE均衡器。在高移动性的情况下，对普通块LMMSE均衡器的改进是显着的。

4. 发明申请

US20060013328A1 Method and detector for a novel channel quality indicator for space-time encoded MIMO spread spectrum systems in frequency selective channels 失效
标题翻译：用于频率选择信道中时空编码MIMO扩频系统的新型信道质量指示符的方法和检测器
公开(公告)号：US20060013328A1
公开(公告)日：2006-01-19
申请号：US10892833
申请日：2004-07-15
申请人： Jianzhong Zhang , Balaji Raghothaman , Yan Wang , Giridhar Mandyam
发明人： Jianzhong Zhang , Balaji Raghothaman , Yan Wang , Giridhar Mandyam
IPC分类号： H04B7/02 , H04L1/02 , H04B1/707
CPC分类号： H04L1/0656 , H04B1/7105 , H04B1/71055 , H04L1/0026 , H04L1/20 , H04L2025/03426 , H04L2025/03617
摘要： In a jointly encoded (JE), spread spectrum communication MIMO system where a demultiplexed packet is transmitted over multiple streams, two versions of a single channel quality indicator (CQI) is disclosed: generalized SNR or constrained mutual information CMI between the transmitted and received chip vectors. In the receiver, the CMI is constrained so that filtering is suboptimal. The filter bank is preferably LMMSE or MVDR filters that convert the multi-path channel into a single path channel so that joint sequence detection is unnecessary. Detection is instead by a per-Walsh code architecture, wherein a plurality of Walsh-code specific detectors in parallel detect bits or symbols from the single-channel chips after downconverting chip to symbols. Link to system mapping is realizable using the disclosed CQI for a JE MIMO system in that the CQI or related information is returned to the transmitter, which adapts coding rate and/or modulation for the channel as represented by the CQI.
摘要翻译：在通过多个流传输解复用的分组的扩频通信MIMO系统中，公开了单个信道质量指示符（CQI）的两个版本：发射和接收的芯片之间的广义SNR或受限互相信息CMI 向量在接收机中，CMI被约束，使得过滤不是最佳的。滤波器组优选地将多路径信道转换成单路径信道的LMMSE或MVDR滤波器，使得不需要联合序列检测。检测是逐个沃尔什码代码架构，其中多个沃尔什码专用检测器在将芯片下变频到符号之后并行地检测来自单通道芯片的位或符号。使用所公开的用于JE MIMO系统的CQI可实现与系统映射的链接，因为CQI或相关信息被返回给发射机，其适配由CQI表示的信道的编码率和/或调制。

5. 发明申请

US20080279091A1 Fourier-transform based linear equalization for MIMO CDMA downlink 审中-公开
公开(公告)号：US20080279091A1
公开(公告)日：2008-11-13
申请号：US12157275
申请日：2008-06-09
申请人： Jianzhong Zhang , Giridhar Mandyam , Yuanbin Guo
发明人： Jianzhong Zhang , Giridhar Mandyam , Yuanbin Guo
IPC分类号： H04J11/00 , H04B7/216 , H04L25/03 , H04B1/00
CPC分类号： H04L25/0244 , H04B7/0845 , H04L25/0204 , H04L25/0206 , H04L25/021 , H04L25/0242 , H04L25/0256 , H04L25/03038 , H04L25/03159 , H04L2025/0342 , H04L2025/03426 , H04L2025/03522 , H04L2025/03605
摘要： In the reception of a downlink MIMO CDMA signal, the receiving unit performs a simplified process of linear equalization that eliminates the need for inverting the correlation matrix. The correlation matrix is approximated to a good degree by a circulation matrix that is diagonalized by FFT operations, thus substituting two FFTs and one IFFT having a complexity of O ( L F  ( N   Δ ) 3 + ( N   Δ ) 2 + 2  ( N   Δ ) 2  L F  log 2  L F ) for the direct matrix inversion having a complexity of O(LF3).

6. 发明授权

US07420916B2 Fourier-transform based linear equalization for MIMO CDMA downlink 失效
公开(公告)号：US07420916B2
公开(公告)日：2008-09-02
申请号：US10861288
申请日：2004-06-04
申请人： Jianzhong Zhang , Giridhar Mandyam , Yuanbin Guo
发明人： Jianzhong Zhang , Giridhar Mandyam , Yuanbin Guo
IPC分类号： H04J11/00
CPC分类号： H04L25/0244 , H04B7/0845 , H04L25/0204 , H04L25/0206 , H04L25/021 , H04L25/0242 , H04L25/0256 , H04L25/03038 , H04L25/03159 , H04L2025/0342 , H04L2025/03426 , H04L2025/03522 , H04L2025/03605
摘要： In the reception of a downlink MIMO CDMA signal, the receiving unit performs a simplified process of linear equalization that eliminates the need for inverting the correlation matrix. The correlation matrix is approximated to a good degree by a circulation matrix that is diagonalized by FFT operations, thus substituting two FFTs and one IFFT having a complexity of O ( L F ⁡ ( N ⁢ ⁢ Δ ) 3 + ( N ⁢ ⁢ Δ ) 2 + 2 ⁢ ( N ⁢ ⁢ Δ ) 2 ⁢ L F ⁢ log 2 ⁢ L F ) for the direct matrix inversion having a complexity of O(LF3).

7. 发明授权

US06873596B2 Fourier-transform based linear equalization for CDMA downlink 失效
标题翻译：用于CDMA下行链路的基于傅里叶变换的线性均衡
公开(公告)号：US06873596B2
公开(公告)日：2005-03-29
申请号：US10436618
申请日：2003-05-13
申请人： Jianzhong Zhang , Tejas Bhatt , Giridhar Mandyam
发明人： Jianzhong Zhang , Tejas Bhatt , Giridhar Mandyam
IPC分类号： H04B7/08 , H04L25/03 , H04J11/00
CPC分类号： H04L25/0242 , H04B7/0845 , H04L25/0204 , H04L25/021 , H04L25/0256 , H04L25/03159 , H04L2025/0342 , H04L2025/03426 , H04L2025/03522 , H04L2025/03605
摘要： In the reception of a CDMA signal, the receiving unit performs a simplified process of linear equalization that eliminates the need for inverting the correlation matrix. For the single antenna reception case, the correlation matrix is approximated to a good degree by a circulation matrix that is diagonalized by FFT operations, thus substituting two FFTs and one IFFT having a complexity of O({fraction (3/2)}LFlog LF) for the direct matrix inversion having a complexity of O(LF3). The extension of this method uses a multiple antenna reception system with oversampling.
摘要翻译：在CDMA信号的接收中，接收单元执行线性均衡的简化处理，消除了反相相关矩阵的需要。对于单天线接收情况，相关矩阵通过由FFT操作对角化的循环矩阵来很好地近似，从而将复杂度为O（{fraction（3 / 2LFlog LF））的两个FFT和一个IFFT替换为具有O（LF <3>）复杂度的直接矩阵反演，该方法的扩展使用具有过采样的多天线接收系统。

8. 发明授权

US07606319B2 Method and detector for a novel channel quality indicator for space-time encoded MIMO spread spectrum systems in frequency selective channels 失效
标题翻译：用于频率选择信道中时空编码MIMO扩频系统的新型信道质量指示符的方法和检测器
公开(公告)号：US07606319B2
公开(公告)日：2009-10-20
申请号：US10892833
申请日：2004-07-15
申请人： Jianzhong Zhang , Balaji Raghothaman , Yan Wang , Giridhar Mandyam
发明人： Jianzhong Zhang , Balaji Raghothaman , Yan Wang , Giridhar Mandyam
IPC分类号： H04B7/02
CPC分类号： H04L1/0656 , H04B1/7105 , H04B1/71055 , H04L1/0026 , H04L1/20 , H04L2025/03426 , H04L2025/03617
摘要： In a JE, spread spectrum communication MIMO system where a demultiplexed packet is transmitted over multiple streams, two versions of a single CQI are disclosed: generalized SNR or constrained mutual information CMI between the transmitted and received chip vectors. In the receiver, the CMI is constrained so that filtering is suboptimal. The filter bank is preferably LMMSE or MVDR filters that convert the multi-path channel into a single path channel so that joint sequence detection is unnecessary. Detection is by a per-Walsh code architecture, wherein a plurality of Walsh-code specific detectors in parallel detect bits or symbols from the single-channel chips after downconverting chip to symbols. Link to system mapping is realizable using the disclosed CQI for a JE MIMO system in that the CQI or related information is returned to the transmitter, which adapts coding rate and/or modulation for the channel as represented by the CQI.
摘要翻译：在扩频通信MIMO系统中，通过多个流传输解复用分组的扩频通信MIMO系统，公开了单个CQI的两个版本：发送和接收的码片向量之间的广义SNR或受限互相信息CMI。在接收机中，CMI被约束，使得过滤不是最佳的。滤波器组优选地将多路径信道转换成单路径信道的LMMSE或MVDR滤波器，使得不需要联合序列检测。检测是通过沃尔什码结构进行的，其中多个沃尔什码专用检测器在将芯片下变频到符号之后并行地检测来自单通道芯片的位或符号。使用所公开的用于JE MIMO系统的CQI可实现与系统映射的链接，因为CQI或相关信息被返回给发射机，其适配由CQI表示的信道的编码率和/或调制。

9. 发明申请

US20070280336A1 Constrained Optimization Based Mimo Lmmse-Sic Receiver for Cdma Downlink 审中-公开
标题翻译：用于Cdma下行链路的基于Mimo Lmmse-Sic接收器的约束优化
公开(公告)号：US20070280336A1
公开(公告)日：2007-12-06
申请号：US10590671
申请日：2005-02-23
申请人： Jianzhong Zhang , Balaji Raghothaman , Giridhar Mandyam
发明人： Jianzhong Zhang , Balaji Raghothaman , Giridhar Mandyam
IPC分类号： H04Q7/00
CPC分类号： H04L25/03292 , H04L1/0631 , H04L1/0656
摘要： A system according to embodiments of this invention provide a multiple transmit antenna (117-1 . . . M), multiple receive antenna (121-1 . . . N) (MIMO) receiver (125) design for the communication downlinks such as those used in CDMA technology. Two algorithms referred to as the MIMO LMMSE-FFT and MIMO LMMSE-SIC (Successive Interference Cancellation) algorithms, are described in detail. In embodiments of the invention, the interference cancellation step is achieved without the impractical assumption of the knowledge of all the active Walsh codes in the systems, unlike many other interference cancellation based algorithms found in the literature.
摘要翻译：根据本发明的实施例的系统提供用于诸如那些通信下行链路的多个发射天线（117-1M），多个接收天线（121-1.1）（MIMO）接收机（125）设计用于CDMA技术。被称为MIMO LMMSE-FFT和MIMO LMMSE-SIC（连续干扰消除）算法的两种算法被详细描述。在本发明的实施例中，与在文献中发现的许多其他基于干扰消除的算法不同，实现干扰消除步骤，而不需要系统中所有活动沃尔什码的知识的不切实际的假设。

10. 发明授权

US07502312B2 Fourier-transform based linear equalization for CDMA downlink 失效
标题翻译：用于CDMA下行链路的基于傅里叶变换的线性均衡
公开(公告)号：US07502312B2
公开(公告)日：2009-03-10
申请号：US11030662
申请日：2005-01-05
申请人： Jianzhong Zhang , Tejas Bhatt , Giridhar Mandyam
发明人： Jianzhong Zhang , Tejas Bhatt , Giridhar Mandyam
IPC分类号： H04J11/00
CPC分类号： H04L25/0242 , H04B7/0845 , H04L25/0204 , H04L25/021 , H04L25/0256 , H04L25/03159 , H04L2025/0342 , H04L2025/03426 , H04L2025/03522 , H04L2025/03605
摘要： In the reception of a CDMA signal, the receiving unit performs a simplified process of linear equalization that eliminates the need for inverting the correlation matrix. For the single antenna reception case, the correlation matrix is approximated to a good degree by a circulation matrix that is diagonalized by FFT operations, thus substituting two FFTs and one IFFT having a complexity of O(3/2 LF log LF) for the direct matrix inversion having a complexity of O(LF3). The extension of this method uses a multiple antenna reception system with oversampling.
摘要翻译：在CDMA信号的接收中，接收单元执行线性均衡的简化处理，消除了反相相关矩阵的需要。对于单天线接收情况，通过由FFT操作对角化的循环矩阵来使相关矩阵近似近似，从而将具有O（3/2 LF log LF）复杂度的两个FFT和一个IFFT替换为直接具有复杂度为O（LF3）的矩阵求逆。该方法的扩展使用具有过采样的多天线接收系统。

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