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1. 发明授权

US07672384B2 Bandwidth and power efficient multicarrier multiple access 有权
标题翻译：带宽和功率效率的多载波多路访问
公开(公告)号：US07672384B2
公开(公告)日：2010-03-02
申请号：US11070855
申请日：2005-03-02
申请人： Georgios B. Giannakis , Shengli Zhou , Pengfei Xia
发明人： Georgios B. Giannakis , Shengli Zhou , Pengfei Xia
IPC分类号： H04K1/10
CPC分类号： H04L5/023
摘要： Techniques are described for multicarrier multiple access wireless transmission, e.g. orthogonal frequency-division multiple access (OFDMA) transmissions, over frequency selective fading channels. The techniques are designed to maintain constant modulus transmissions for uplink while effectively mitigating intersymbol interference. Specifically, the techniques utilize non-redundant unitary precoding across OFDMA subcarriers to maintain constant modulus transmissions for uplink communications. For example, the techniques involve precoding a block of information symbols and assigning a different subcarrier for each symbol of the block. The subcarriers are selected to be equi-spaced and may be selected, for example, from a phase-shift keying constellation. The number of symbols per block is equal to the number of subcarriers assigned per user. Importantly, even with multiple subcarriers per user, the techniques enable constant modulus transmissions for uplink. Consequently, the techniques may achieve high power and bandwidth efficiency as well as improved performance over conventional OFDMA and GMC-CDMA transmissions.
摘要翻译：描述了用于多载波多址无线传输的技术，例如。正交频分多址（OFDMA）传输，频率选择性衰落信道。这些技术被设计为保持上行链路的恒定模数传输，同时有效地减轻符号间干扰。具体地说，这些技术利用跨OFDMA子载波的非冗余单一预编码来维持用于上行链路通信的恒模传输。例如，这些技术涉及对信息符号块进行预编码并为块的每个符号分配不同的子载波。子载波被选择为等间距，并且可以例如从相移键控星座中选择。每个块的符号数等于每个用户分配的子载波数。重要的是，即使每个用户有多个子载波，这些技术也可以实现上行链路的恒定模数传输。因此，与传统的OFDMA和GMC-CDMA传输相比，这些技术可以实现高功率和带宽效率以及改进的性能。

2. 发明授权

US07251768B2 Wireless communication system having error-control coder and linear precoder 有权
标题翻译：具有误差控制编码器和线性预编码器的无线通信系统
公开(公告)号：US07251768B2
公开(公告)日：2007-07-31
申请号：US10420361
申请日：2003-04-21
申请人： Georgios B. Giannakis , Zhengdao Wang , Shengli Zhou
发明人： Georgios B. Giannakis , Zhengdao Wang , Shengli Zhou
IPC分类号： H03M13/29 , H03M13/45
CPC分类号： H04L1/005 , H03M13/29 , H03M13/2948 , H03M13/2957 , H03M13/6513 , H04L1/0055 , H04L1/0071 , H04L1/04
摘要： In general, joint error-control coding and linear precoding techniques are proposed for fading-resilient transmissions over frequency- at and frequency-selective fading channels encountered with high-rate wireless OFDM transmissions. For example, a wireless communication system includes a transmitter that applies non-linear codes and a linear precoder to a data stream to produce a joint coded-precoded waveform. A receiver receives the joint coded-precoded waveform from the transmitter via a wireless communication channel, and demodulates the joint-coded precoded waveform to produce estimated data. The combination offers a multiplicative benefit to the diversity achievable by the wireless communication system.
摘要翻译：通常，针对在高速率无线OFDM传输中遇到的频率和频率选择性衰落信道的衰落弹性传输，提出了联合误差控制编码和线性预编码技术。例如，无线通信系统包括将非线性码和线性预编码器应用于数据流以产生联合编码预编码波形的发射机。接收机通过无线通信信道从发射机接收联合编码预编码的波形，并解调联合编码的预编码波形以产生估计数据。该组合为无线通信系统可实现的分集带来乘法优势。

3. 发明授权

US06912241B2 Chip-interleaved, block-spread multi-user communication 有权
标题翻译：芯片交错，块传播多用户通信
公开(公告)号：US06912241B2
公开(公告)日：2005-06-28
申请号：US09838621
申请日：2001-04-19
申请人： Georgios B. Giannakis , Shengli Zhou
发明人： Georgios B. Giannakis , Shengli Zhou
IPC分类号： H04B1/7097 , H04J13/00 , H04K1/00 , H04B1/707
CPC分类号： H04J13/004 , H04B1/7097 , H04B2201/709709 , H04L1/0071
摘要： Techniques are described for maintaining the orthogonality of user waveforms in multi-user wireless communication systems, such as systems using the code division multiple access (CDMA) modulation scheme in the presence of frequency-selective fading channels. Unlike conventional systems in which spreading is performed on individual information-bearing symbols, the “chip-interleaved block-spreading” (CIBS) techniques described herein spread blocks of symbols. A transmitter includes a block-spreading unit to form a set of chips for each symbol of a block of information-bearing symbols and to produce a stream of chips in which the chips from different sets are interleaved. A pulse shaping unit within the transmitter generates a transmission signal from the stream of interleaved chips and transmits the signal through a communication channel. A receiver includes a block separator to de-interleave the chips, followed by a match filter to separate signals from different users, and followed by any single-user equalizer.
摘要翻译：描述了用于在多用户无线通信系统中维持用户波形的正交性的技术，例如在存在频率选择性衰落信道的情况下使用码分多址（CDMA）调制方案的系统。不同于在各个信息承载符号上进行扩展的传统系统，本文所述的“片外交错块扩展”（CIBS）技术扩展符号块。发射机包括块扩展单元，用于为信息载体符号块的每个符号形成一组码片，并产生其中来自不同组的码片交错的码片流。发射机内的脉冲整形单元产生来自交错芯片流的发送信号，并通过通信信道发送信号。接收机包括用于对芯片进行解交织的块分离器，随后是匹配滤波器以分离来自不同用户的信号，随后是任何单用户均衡器。

4. 发明授权

US07522673B2 Space-time coding using estimated channel information 有权
标题翻译：使用估计的信道信息进行时空编码
公开(公告)号：US07522673B2
公开(公告)日：2009-04-21
申请号：US10420351
申请日：2003-04-21
申请人： Georgios B. Giannakis , Shengli Zhou
发明人： Georgios B. Giannakis , Shengli Zhou
IPC分类号： H04B7/02
CPC分类号： H03M13/6337 , H03M13/29 , H04B7/0426 , H04B7/0465 , H04L1/0055 , H04L1/04 , H04L1/0618 , H04L25/0204 , H04W52/42
摘要： The invention is directed to techniques for space-time coding in a wireless communication system in which the transmitter makes use of multiple transmit antennas. The transmitter uses channel information estimated by a receiving device and returned to the transmitter, e.g., as feedback. In one exemplary embodiment, the transmitter receives a mean feedback information that defines a mean channel value associated with the different channels of the different antennas. In another exemplary embodiment, the transmitter receives covariance feedback, e.g., statistical values associated with each of the different channels.
摘要翻译：本发明涉及无线通信系统中的时空编码技术，其中发射机利用多个发射天线。发射机使用由接收设备估计的信道信息并返回到发射机，例如作为反馈。在一个示例性实施例中，发射机接收定义与不同天线的不同信道相关联的平均信道值的平均反馈信息。在另一示例性实施例中，发射机接收协方差反馈，例如与不同信道中的每一个相关联的统计值。

5. 发明授权

US07403509B2 Receiver for chip-interleaved block-spread multi-user communication systems 有权
标题翻译：用于芯片交错块扩展多用户通信系统的接收器
公开(公告)号：US07403509B2
公开(公告)日：2008-07-22
申请号：US10841806
申请日：2004-05-07
申请人： Georgios B. Giannakis , Shengli Zhou
发明人： Georgios B. Giannakis , Shengli Zhou
IPC分类号： H04B7/16
CPC分类号： H04B1/7105 , H04L25/03012 , H04L2025/03375 , H04L2025/03605
摘要： Techniques are described for performing block equalization on a received wireless communication signal formed according to interleaved chips generated from sub-blocks of symbols. For example, a one-step block equalization process is described which produces estimates of the information-bearing symbols from a wireless communication signal received from two or more transmitters in a soft handoff environment. The techniques provide improved performance in high load, soft handoff environments with low complexity, highly flexible equalization. The wireless communication signal may be a CIBS-CDMA signal in which a symbol block is divided into sub-blocks and spread by a user-specific block-spreading matrix. The CIBS signal is received through M subchannels and a de-spreading matrix is applied to produce a multi-user interference (MUI) free sub-block output for the mth channel. One-step block equalization comprises forming a single block from the m de-spread sub-blocks and performing block equalization on the single block.
摘要翻译：描述了对根据从符号子块生成的交织的码片形成的接收的无线通信信号执行块均衡的技术。例如，描述了从在软切换环境中从两个或更多个发射机接收的无线通信信号产生信息承载符号的估计的一步块均衡处理。这些技术在高负载，软切换环境中提供了改进的性能，具有低复杂度，高度灵活的均衡。无线通信信号可以是CIBS-CDMA信号，其中符号块被划分成子块并由用户特定的块扩展矩阵扩展。通过M个子信道接收CIBS信号，并且应用去扩展矩阵以产生用于第m个/第二信道的多用户干扰（MUI）空闲子块输出。一步块均衡包括从m个解扩子块形成单个块，并在单个块上执行块均衡。

6. 发明授权

US07190734B2 Space-time coded transmissions within a wireless communication network 有权
标题翻译：无线通信网络内的时空编码传输
公开(公告)号：US07190734B2
公开(公告)日：2007-03-13
申请号：US10158390
申请日：2002-05-28
申请人： Georgios B. Giannakis , Shengli Zhou
发明人： Georgios B. Giannakis , Shengli Zhou
IPC分类号： H04B7/02 , H04B7/06
CPC分类号： H04L27/2607 , H04L1/0618 , H04L5/0023 , H04L5/0048
摘要： Techniques are described for space-time block coding for single-carrier block transmissions over frequency selective multipath fading channels. Techniques are described that achieve a maximum diversity of order NtNr(L+1) in rich scattering environments, where Nt(Nr) is the number of transmit (receive) antennas, and L is the order of the finite impulse response (FIR) channels. The techniques may include parsing a stream of information-bearing symbols to form blocks of K symbols, precoding the symbols to form blocks having J symbols, and collecting consecutive NS blocks. The techniques may further include applying a permutation matrix to the NS blocks, generating a space-time block coded matrix having Nt rows that are communicated through a wireless communication medium. The receiver complexity is comparable to single antenna transmissions, and the exact Viterbi's algorithm can be applied for maximum-likelihood (ML) optimal decoding.
摘要翻译：描述了用于通过频率选择性多径衰落信道进行单载波块传输的时空块编码的技术。描述了在富散射环境中达到N N（N + 1）N（N + 1）的最大分集的技术，其中N N（N 发射（接收）天线的数量，L是有限脉冲响应（FIR）信道的顺序。这些技术可以包括解析携带信息的符号流以形成K个符号的块，对符号进行预编码以形成具有J个符号的块，以及收集连续的N个块。这些技术可以进一步包括将置换矩阵应用于N N个块，产生具有通过无线通信介质传送的N T行的时空块编码矩阵。接收机复杂度与单天线传输相当，并且可以将精确的维特比算法应用于最大似然（ML）最优解码。

7. 发明授权

US07609782B2 Space-time coded transmissions within a wireless communication network 有权
标题翻译：无线通信网络内的时空编码传输
公开(公告)号：US07609782B2
公开(公告)日：2009-10-27
申请号：US11682664
申请日：2007-03-06
申请人： Georgios B. Giannakis , Shengli Zhou
发明人： Georgios B. Giannakis , Shengli Zhou
IPC分类号： H04B7/06 , H04B7/02
CPC分类号： H04L27/2607 , H04L1/0618 , H04L5/0023 , H04L5/0048
摘要： Techniques are described for space-time block coding for single-carrier block transmissions over frequency selective multipath fading channels. Techniques are described that achieve a maximum diversity of order NtNr (L+1) in rich scattering environments, where Nt (Nr) is the number of transmit (receive) antennas, and L is the order of the finite impulse response (FIR) channels. The techniques may include parsing a stream of information-bearing symbols to form blocks of K symbols, precoding the symbols to form blocks having J symbols, and collecting consecutive Ns blocks. The techniques may further include applying a permutation matrix to the Ns blocks, generating a space-time block coded matrix having Nt rows that are communicated through a wireless communication medium. The receiver complexity is comparable to single antenna transmissions, and the exact Viterbi's algorithm can be applied for maximum-likelihood (ML) optimal decoding.
摘要翻译：描述了用于通过频率选择性多径衰落信道进行单载波块传输的时空块编码的技术。描述了在富散射环境中实现NtNr（L + 1）的最大分集的技术，其中Nt（Nr）是发射（接收）天线的数量，并且L是有限脉冲响应（FIR）信道的阶数。这些技术可以包括解析携带信息的符号流以形成K个符号的块，对符号进行预编码以形成具有J个符号的块，以及收集连续的N个块。这些技术可以进一步包括将置换矩阵应用于Ns块，产生具有通过无线通信介质传送的Nt个行的时空块编码矩阵。接收机复杂度与单天线传输相当，并且可以将精确的维特比算法应用于最大似然（ML）最优解码。

8. 发明授权

US07139321B2 Channel estimation for wireless OFDM systems 有权
公开(公告)号：US07139321B2
公开(公告)日：2006-11-21
申请号：US10094946
申请日：2002-03-07
申请人： Georgios B. Giannakis , Shengli Zhou
发明人： Georgios B. Giannakis , Shengli Zhou
IPC分类号： H04K1/10
CPC分类号： H04L25/022 , H04L25/0238 , H04L27/2647
摘要： Techniques are described for efficiently estimating and compensating for the effects of a communication channel in a multi-carrier wireless communication system. The techniques exploit the fact that the transmitted symbols are drawn from a finite-alphabet to efficiently estimate the propagation channel for multi-carrier communication systems, such systems using OFDM modulation. A transmitter transmits data through a communication channel according to the modulation format. A receiver includes a demodulator to demodulate the data and an estimator to estimate the channel based on the demodulated data. The channel estimator applies a power-law operation to the demodulated data to identify the channel. The techniques can be used in both blind and semi-blind modes of channel estimation.

9. 发明申请

US20050220200A1 Bandwidth and power efficient multicarrier multiple access 有权
标题翻译：带宽和功率效率的多载波多路访问
公开(公告)号：US20050220200A1
公开(公告)日：2005-10-06
申请号：US11070855
申请日：2005-03-02
申请人： Georgios Giannakis , Shengli Zhou , Pengfei Xia
发明人： Georgios Giannakis , Shengli Zhou , Pengfei Xia
IPC分类号： H04K1/10 , H04L5/02
CPC分类号： H04L5/023
摘要： Techniques are described for multicarrier multiple access wireless transmission, e.g. orthogonal frequency-division multiple access (OFDMA) transmissions, over frequency selective fading channels. The techniques are designed to maintain constant modulus transmissions for uplink while effectively mitigating intersymbol interference. Specifically, the techniques utilize non-redundant unitary precoding across OFDMA subcarriers to maintain constant modulus transmissions for uplink communications. For example, the techniques involve precoding a block of information symbols and assigning a different subcarrier for each symbol of the block. The subcarriers are selected to be equi-spaced and may be selected, for example, from a phase-shift keying constellation. The number of symbols per block is equal to the number of subcarriers assigned per user. Importantly, even with multiple subcarriers per user, the techniques enable constant modulus transmissions for uplink. Consequently, the techniques may achieve high power and bandwidth efficiency as well as improved performance over conventional OFDMA and GMC-CDMA transmissions.
摘要翻译：描述了用于多载波多址无线传输的技术，例如。正交频分多址（OFDMA）传输，频率选择性衰落信道。这些技术被设计为保持上行链路的恒定模数传输，同时有效地减轻符号间干扰。具体地说，这些技术利用跨OFDMA子载波的非冗余单一预编码来维持用于上行链路通信的恒模传输。例如，这些技术涉及对信息符号块进行预编码并为块的每个符号分配不同的子载波。子载波被选择为等间距，并且可以例如从相移键控星座中选择。每个块的符号数等于每个用户分配的子载波数。重要的是，即使每个用户有多个子载波，这些技术也可以实现上行链路的恒定模数传输。因此，与传统的OFDMA和GMC-CDMA传输相比，这些技术可以实现高功率和带宽效率以及改进的性能。

10. 发明授权

US08467269B2 Apparatus, systems and methods for enhanced detection, synchronization and online Doppler scale estimation for underwater acoustic communications 有权
标题翻译：用于水下声学通信的增强检测，同步和在线多普勒尺度估计的装置，系统和方法
公开(公告)号：US08467269B2
公开(公告)日：2013-06-18
申请号：US12752239
申请日：2010-04-01
申请人： Shengli Zhou , Peter Willett , Christian Berger , Sean Mason
发明人： Shengli Zhou , Peter Willett , Christian Berger , Sean Mason
IPC分类号： H04B11/00 , G01V1/18
CPC分类号： H04B11/00 , G01V1/18
摘要： Advantageous online and/or real-time OFDM-based underwater acoustic (UWA) apparatus, systems and methods are provided according to the present disclosure. The apparatus, systems and methods employ a receiver with a bank of parallel branches, with each branch having a self-correlator matched to a different waveform scaling factor. A detection is declared when any of the branches leads to a correlation metric larger than a pre-defined threshold. The branch with the largest metric yields a Doppler scale estimate and a coarse synchronization point. The proposed apparatus, systems and methods use one OFDM preamble, thereby avoiding the need to buffer the whole data packet before data demodulation and enabling online and/or real-time operation. Thus, the disclosed apparatus, systems and methods are advantageously applicable to UWA communications.
摘要翻译：根据本公开提供有利的在线和/或实时基于OFDM的水下声学（UWA）设备，系统和方法。装置，系统和方法采用具有一组并行分支的接收机，每个分支具有与不同波形比例因子匹配的自相关器。当任何分支导致大于预定义阈值的相关度量时，声明检测。具有最大度量的分支产生多普勒量程估计和粗略同步点。所提出的装置，系统和方法使用一个OFDM前导码，从而避免在数据解调之前缓冲整个数据分组并且允许在线和/或实时操作。因此，所公开的装置，系统和方法有利地适用于UWA通信。

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