公开(公告)号：US07961819B1

公开(公告)日：2011-06-14

申请号：US12645606

申请日：2009-12-23

申请人： Hui-Ling Lou ,  Kok-Wui Cheong

发明人： Hui-Ling Lou ,  Kok-Wui Cheong

IPC分类号： H04L27/22

CPC分类号： H04L1/0631 ,  H04L25/0212 ,  H04L27/22 ,  H04L27/38 ,  H04W84/12

摘要： A wireless communications system including an antenna configured to receive a sequence of symbols through a channel, in which the sequence of symbols comprise bits of user data that have been previously mapped to the sequence of symbols. The wireless communications system further includes a demodulator configured to generate a sequence of demodulated symbols by multiplying the sequence of symbols by a conjugate of a channel response of the channel; a demultiplexer configured to generate an in-phase component and a quadrature component of each demodulated symbol in the sequence of demodulated symbols; a slicer configured to, for each demodulated symbol, generate a decoded symbol by performing a hard decision based on the in-phase component and the quadrature component of the demodulated symbol; and a bit mapping module configured to determine the bits of user data associated with each decoded symbol.

摘要翻译： 一种无线通信系统，包括被配置为通过信道接收符号序列的天线，其中所述符号序列包括先前映射到所述符号序列的用户数据的比特。 无线通信系统还包括解调器，其被配置为通过将符号序列乘以信道的信道响应的共轭来生成解调符号序列; 解复用器，被配置为在解调符号序列中产生每个解调符号的同相分量和正交分量; 一个限幅器，被配置为对于每个解调符号，通过基于解调符号的同相分量和正交分量执行硬判决来产生解码符号; 以及配置为确定与每个解码符号相关联的用户数据的比特的比特映射模块。

公开(公告)号：US07952990B1

公开(公告)日：2011-05-31

申请号：US12628912

申请日：2009-12-01

申请人： Hui-Ling Lou ,  Kok-Wui Cheong

发明人： Hui-Ling Lou ,  Kok-Wui Cheong

IPC分类号： H04J11/00 ,  H03K9/00 ,  H04L27/00 ,  H04L7/00

CPC分类号： H04L25/0204 ,  H04L5/0007 ,  H04L25/022 ,  H04L25/0232 ,  H04L27/2601 ,  H04L27/261

摘要： Methods and systems for communication include receiving a signal across a channel, the signal indicative of a preamble and multiple data symbols, determining first channel estimate information of the channel based on the received preamble, using the first channel estimate information to demodulate a data symbol from the multiple data symbols as received, determining a constellation point based on the demodulated data symbol to produce a decoded data symbol, determining second channel estimate information based on the demodulated data symbol and the decoded data symbol, and using the second channel estimate information to demodulate an additional data symbol from the multiple data symbols as received.

摘要翻译： 用于通信的方法和系统包括：通过信道接收信号，指示前导码的信号和多个数据符号，使用第一信道估计信息来基于所接收的前导码确定信道的第一信道估计信息，以从 所接收的多个数据符号，基于解调的数据符号确定星座点以产生解码的数据符号，基于解调的数据符号和解码的数据符号确定第二信道估计信息，并且使用第二信道估计信息来解调 来自所接收的多个数据符号的附加数据符号。

公开(公告)号：US07065146B1

公开(公告)日：2006-06-20

申请号：US10259024

申请日：2002-09-26

申请人： Hui-Ling Lou ,  Kok-Wui Cheong

发明人： Hui-Ling Lou ,  Kok-Wui Cheong

IPC分类号： H04L23/02 ,  H04B7/02

CPC分类号： H04L25/0328 ,  H04B7/0857 ,  H04L1/0054 ,  H04L25/0206 ,  H04L25/03286 ,  H04L25/03292 ,  H04L2025/03414 ,  H04L2025/03522

摘要： Joint equalization and decoding techniques to eliminate the division operations in the Frequency domain Equalizer (FEQ) of an Orthogonal Frequency Division Modulation (OFDM) receiver by incorporating the magnitude of the channel impulse response estimates into the decision metrics in the decoder. This includes methods for both hard-decision symbol-by-symbol detection and soft-decision decoding using the Viterbi algorithm. Further, Channel State Information (CSI) is incorporated to improve the performance of the receiver. The disclosure also introduces a computationally efficient bit-by-bit piecewise approximation technique incorporating CSI to implement decoder decision metrics. Finally, an efficient implementation technique for multiple receiver antennae using Maximum Ratio Combining (MRC) and Viterbi decoding with CSI is disclosed.

摘要翻译： 联合均衡和解码技术通过将信道脉冲响应估计的幅度并入解码器中的决策度量来消除正交频分调制（OFDM）接收机的频域均衡器（FEQ）中的除法运算。 这包括使用维特比算法进行硬判决逐符号检测和软判决解码的方法。 此外，通过信道状态信息（CSI）来提高接收机的性能。 本公开还引入了一种计算上有效的逐位逼近技术，其包含CSI以实现解码器决策度量。 最后，公开了使用最大比组合（MRC）和维特比解码与CSI的多接收机天线的有效实现技术。

公开(公告)号：US08634483B1

公开(公告)日：2014-01-21

申请号：US13567599

申请日：2012-08-06

申请人： Hui-Ling Lou ,  Kok-Wui Cheong ,  Randy Tsang

发明人： Hui-Ling Lou ,  Kok-Wui Cheong ,  Randy Tsang

IPC分类号： H04L27/00

CPC分类号： H04B1/38 ,  H04B7/0413 ,  H04B7/0891 ,  H04L1/0002 ,  H04L1/0625 ,  H04L5/0003 ,  H04L5/003 ,  H04L25/03343 ,  H04L2025/03426

摘要： A wireless communication device includes a medium access control device, a first module and a second module. The medium access control device is configured to determine a first parameter based on a condition of a channel. The wireless communication device communicates, via the channel, with a device separate from the wireless communication device. The first module is configured to, based on the first parameter, determine whether an operating environment of the wireless communication device is a rich-scattering environment or a line of sight environment. The second module is configured to adjust a second parameter of the wireless communication device based on the operating environment as determined by the first module. The second parameter is different than the first parameter.

摘要翻译： 无线通信设备包括介质访问控制设备，第一模块和第二模块。 介质访问控制设备被配置为基于信道的条件来确定第一参数。 无线通信设备经由信道与与无线通信设备分离的设备进行通信。 第一模块被配置为基于第一参数来确定无线通信设备的操作环境是富散射环境还是视线环境。 第二模块被配置为基于由第一模块确定的操作环境来调整无线通信设备的第二参数。 第二个参数与第一个参数不同。

公开(公告)号：US08494068B1

公开(公告)日：2013-07-23

申请号：US13400291

申请日：2012-02-20

申请人： Hui-Ling Lou ,  Kok-Wui Cheong

发明人： Hui-Ling Lou ,  Kok-Wui Cheong

IPC分类号： H04K1/10 ,  H04L27/06

CPC分类号： H04L27/2649 ,  H03M13/4107 ,  H04B7/0857 ,  H04L1/0047 ,  H04L1/0054 ,  H04L25/0202 ,  H04L25/03159 ,  H04L25/03286

摘要： A method and apparatus for processing a frequency domain digital Orthogonal Frequency Division Multiplexing (OFDM) symbol. The method includes generating an estimate of a channel for each sub carrier of the OFDM symbol, generating channel state information corresponding to each sub carrier of the OFDM symbol, and generating a plurality of demodulated symbols based, at least in part on, the estimate of the channel for each sub carrier of the OFDM symbol. Each demodulated symbol corresponds to a given sub carrier of the OFDM symbol. The method further includes performing a soft decision decoding on each demodulated symbol to generate a corresponding soft decision decoded symbol. The soft decision decoding of each demodulated symbol is based, at least in part, on the channel state information corresponding to the given sub carrier associated with the demodulated symbol.

摘要翻译： 一种用于处理频域数字正交频分复用（OFDM）符号的方法和装置。 该方法包括：生成OFDM符号的每个子载波的信道的估计，产生与OFDM符号的每个子载波相对应的信道状态信息，以及至少部分地基于OFDM符号的估计来生成多个解调符号 OFDM符号的每个子载波的信道。 每个解调符号对应于OFDM符号的给定子载波。 该方法还包括对每个解调的符号执行软判决解码以产生相应的软判决解码符号。 每个解调符号的软判决解码至少部分地基于对应于与解调符号相关联的给定子载波的信道状态信息。

公开(公告)号：US08437417B1

公开(公告)日：2013-05-07

申请号：US13404656

申请日：2012-02-24

申请人： Hui-Ling Lou ,  Kok-Wui Cheong

发明人： Hui-Ling Lou ,  Kok-Wui Cheong

IPC分类号： H04L27/28 ,  H04L27/06

CPC分类号： H04L1/0052 ,  H03M13/4107 ,  H03M13/6331 ,  H04L1/0054

摘要： A system includes a channel estimator configured to receive a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols via a plurality of respective antennas, and generate estimates of a channel based on the plurality of OFDM symbols. A demodulator is configured to generate a plurality of demodulated symbols based on the plurality of OFDM symbols and the estimates of the channel. A decoder is configured to receive the estimates of the channel from the channel estimator, receive the plurality of demodulated symbols from the demodulator, and calculate decision metrics for the plurality of OFDM symbols using both the estimates of the channel and the plurality of demodulated symbols.

摘要翻译： 一种系统包括：信道估计器，被配置为经由多个相应天线接收多个正交频分复用（OFDM）符号，并且基于所述多个OFDM符号来生成信道的估计。 解调器被配置为基于多个OFDM符号和信道的估计来生成多个解调符号。 解码器被配置为从信道估计器接收信道的估计，从解调器接收多个解调符号，并且使用信道估计和多个解调符号来计算多个OFDM符号的判定度量。

公开(公告)号：US07688902B1

公开(公告)日：2010-03-30

申请号：US10675693

申请日：2003-09-30

申请人： Hui-Ling Lou ,  Kok-Wui Cheong

发明人： Hui-Ling Lou ,  Kok-Wui Cheong

IPC分类号： H04L27/28

CPC分类号： H04L1/0065 ,  H04L1/0054 ,  H04L1/0631

摘要： A space-time block decoder for a wireless communications system includes a demodulator that generates a demodulated symbol sequence by derotating a signal constellation of a received symbol sequence. A dimension demultiplexer communicates with the demodulator and generates in-phase and quadrature components of the demodulated symbol sequence. A branch metric computation module communicates with the dimension demultiplexer and generates branch metrics based on the in-phase and quadrature components. A Viterbi decoder communicates with the branch metric computation module and generates a user data sequence based on the branch metrics. The in-phase and quadrature components comprise Gray coded data that is bit-interleaved. The branch metric computation module implements bit-by-bit piecewise linear approximation to generate the branch metrics. A deinterleaver that communicates with the branch metric computation module generates deinterleaved metrics based on the branch metrics.

摘要翻译： 用于无线通信系统的时空块解码器包括解调器，该解调器通过对接收到的符号序列的信号星座进行解转而产生解调的符号序列。 尺寸解复用器与解调器通信并产生解调符号序列的同相和正交分量。 分支度量计算模块与维度解复用器进行通信，并且基于同相和正交分量生成分支度量。 维特比解码器与分支度量计算模块进行通信，并且基于分支度量生成用户数据序列。 同相和正交分量包括被比特交织的格雷编码数据。 分支度量计算模块实现逐位分段线性近似以生成分支度量。 与分支度量计算模块通信的解交织器基于分支度量生成解交织的度量。

公开(公告)号：US07639600B1

公开(公告)日：2009-12-29

申请号：US10647163

申请日：2003-08-21

申请人： Hui-Ling Lou ,  Kok-Wui Cheong

发明人： Hui-Ling Lou ,  Kok-Wui Cheong

IPC分类号： H04J11/00 ,  H04B17/02 ,  H03K9/00

CPC分类号： H04L25/0204 ,  H04L5/0007 ,  H04L25/022 ,  H04L25/0232 ,  H04L27/2601 ,  H04L27/261

摘要： Low complexity channel estimation techniques for orthogonal frequency division modulation (OFDM) systems. The channel estimation techniques may be applied to IEEE 802.11a/g and 802.16 systems.

摘要翻译： 用于正交频分调制（OFDM）系统的低复杂度信道估计技术。 信道估计技术可以应用于IEEE 802.11a / g和802.16系统。

公开(公告)号：US08126074B1

公开(公告)日：2012-02-28

申请号：US12686111

申请日：2010-01-12

申请人： Hui-Ling Lou ,  Kok-Wui Cheong

发明人： Hui-Ling Lou ,  Kok-Wui Cheong

IPC分类号： H04L5/12 ,  H04L27/06

CPC分类号： H04L27/2649 ,  H03M13/4107 ,  H04B7/0857 ,  H04L1/0047 ,  H04L1/0054 ,  H04L25/0202 ,  H04L25/03159 ,  H04L25/03286

摘要： A method and apparatus for processing a frequency domain digital Orthogonal Frequency Division Multiplexing (OFDM) symbol. The method includes generating an estimate of a channel for each sub-carrier of the frequency domain digital OFDM symbol; generating channel state information corresponding to each sub-carrier of the frequency domain digital OFDM symbol; and generating a plurality of demodulated symbols based, at least in part on, the estimate of the channel for each sub-carrier of the frequency domain digital Orthogonal Frequency Division Multiplexing (OFDM) symbol, in which each demodulated symbol corresponding to a given sub-carrier of the frequency domain digital OFDM symbol. The method further includes performing a soft-decision decoding on each demodulated symbol to generate a corresponding soft-decision decoded symbol. The soft-decision decoding of each demodulated symbol is based, at least in part, on the channel state information corresponding to the given sub-carrier associated with the demodulated symbol.

摘要翻译： 一种用于处理频域数字正交频分复用（OFDM）符号的方法和装置。 该方法包括：生成针对频域数字OFDM符号的每个子载波的信道的估计; 产生与所述频域数字OFDM符号的每个子载波相对应的信道状态信息; 以及至少部分地基于频域数字正交频分复用（OFDM）符号的每个子载波的信道的估计来生成多个解调符号，其中对应于给定子载波的每个解调符号， 频域数字OFDM符号的载波。 该方法还包括对每个解调符号执行软判决解码以产生相应的软判决解码符号。 每个解调符号的软判决解码至少部分地基于对应于与解调符号相关联的给定子载波的信道状态信息。

公开(公告)号：US07630462B1

公开(公告)日：2009-12-08

申请号：US12150836

申请日：2008-05-01

申请人： Hui-Ling Lou ,  Kok-Wui Cheong

发明人： Hui-Ling Lou ,  Kok-Wui Cheong

IPC分类号： H04L27/06

CPC分类号： H04L27/2649 ,  H03M13/4107 ,  H04B7/0857 ,  H04L1/0047 ,  H04L1/0054 ,  H04L25/0202 ,  H04L25/03159 ,  H04L25/03286

摘要： A Viterbi decoder decdes a symbol that includes a plurality of subcarriers defining modulated data. The Viterbi decoder includes a branch metric computation unit to compute a branch metric for the symbol based on real and imaginary portions of the plurality of subcarriers, channel state information associated with the plurality of subcarriers, and a piecewise bit-by-bit approximation. The Viterbi decoder includes a most-likely codeword estimator to estimate a transmitted coded bit sequence based on the branch metrics computed by the branch metric computation unit for the symbol.

摘要翻译： 维特比解码器解码包括定义调制数据的多个子载波的符号。 维特比解码器包括分支度量计算单元，用于基于多个子载波的实部和虚部，与多个子载波相关联的信道状态信息以及分段逐比特近似来计算符号的分支度量。 维特比解码器包括最可能的码字估计器，用于基于由符号的分支度量计算单元计算的分支度量来估计发送的编码比特序列。