公开(公告)号：US06522683B1

公开(公告)日：2003-02-18

申请号：US09636008

申请日：2000-08-10

申请人： John E. Smee ,  Ahmad Jalali ,  Fuyun Ling ,  Mark Wallace

发明人： John E. Smee ,  Ahmad Jalali ,  Fuyun Ling ,  Mark Wallace

IPC分类号： H04B169

CPC分类号： H04B1/7097 ,  H04L25/03038 ,  H04L2025/03375 ,  H04L2025/03477

摘要： A receive filter receives signals from a communication channel. The received signals correspond to original Walsh covered chip sequences transmitted by a transmit filter through the communication channel to the receive filter. The received signals are processed by an equalizer to generate a soft estimate of chip sequences corresponding to the original Walsh covered chip sequences. An N chip Walsh decover is then utilized to generate a soft estimate of code symbols corresponding to the soft estimate of the chip sequences. A number of symbol slicers are then used in parallel to produce a hard estimate of the code symbols corresponding to the soft estimate of code symbols generated by the N chip Walsh decover. Thereafter an N chip Walsh cover is used as part of a scheme to generate a hard estimate of chip sequences corresponding to the hard estimate of the code symbols generated by the symbol slicers. The hard estimate of the chip sequences generated with the aid of the N chip Walsh cover, and the soft estimate of the chip sequences generated by the equalizer, are used to generate a tracking mode error signal to adapt the response of the equalizer to the received signals.

公开(公告)号：US07035316B2

公开(公告)日：2006-04-25

申请号：US10315707

申请日：2002-12-09

申请人： John E. Smee ,  Ahmad Jalali ,  Fuyun Ling ,  Mark Wallace

发明人： John E. Smee ,  Ahmad Jalali ,  Fuyun Ling ,  Mark Wallace

IPC分类号： H04B1/69 ,  H03K5/159

CPC分类号： H04B1/7097 ,  H04L25/03038 ,  H04L2025/03375 ,  H04L2025/03477

摘要： A receive filter receives signals from a communication channel. The received signals correspond to original Walsh covered chip sequences transmitted by a transmit filter through the communication channel to the receive filter. The received signals are processed by an equalizer to generate a soft estimate of chip sequences corresponding to the original Walsh covered chip sequences. An N chip Walsh decover is then utilized to generate a soft estimate of code symbols corresponding to the soft estimate of the chip sequences. A number of symbol slicers are then used in parallel to produce a hard estimate of the code symbols corresponding to the soft estimate of code symbols generated by the N chip Walsh decover. Thereafter an N chip Walsh cover is used as part of a scheme to generate a hard estimate of chip sequences corresponding to the hard estimate of the code symbols generated by the symbol slicers. The hard estimate of the chip sequences generated with the aid of the N chip Walsh cover, and the soft estimate of the chip sequences generated by the equalizer, are used to generate a tracking mode error signal to adapt the response of the equalizer to the received signals.

摘要翻译： 接收滤波器从通信信道接收信号。 接收到的信号对应于由发射滤波器通过通信信道发射到接收滤波器的原始沃尔什覆盖码片序列。 所接收的信号由均衡器处理以产生对应于原始沃尔什覆盖码片序列的码片序列的软估计。 然后利用N个芯片沃尔什解密来产生对应于芯片序列的软估计的码符号的软估计。 然后，并行地使用多个符号限幅器，以产生对应于由N个芯片沃尔什覆盖生成的码符号的软估计对应的码符号的硬估计。 此后，N芯片沃尔什覆盖被用作方案的一部分，以产生对应于由符号限幅器产生的码符号的硬估计的码片序列的硬估计。 借助于N芯片沃尔什覆盖生成的芯片序列的硬估计和由均衡器产生的芯片序列的软估计被用于产生跟踪模式误差信号，以使均衡器的响应适应于接收到的 信号。

公开(公告)号：US07333560B2

公开(公告)日：2008-02-19

申请号：US11328807

申请日：2006-01-09

申请人： Ahmad Jalali ,  John E. Smee ,  Mark Wallace

发明人： Ahmad Jalali ,  John E. Smee ,  Mark Wallace

IPC分类号： H04K1/02

CPC分类号： H04L1/0032 ,  H04B7/0434 ,  H04B7/0626 ,  H04L1/0003 ,  H04L1/0013 ,  H04L1/0026 ,  H04L1/0034 ,  H04L1/06 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/03343 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426

摘要： Techniques to process data for transmission in a time division duplexed (TDD) communication system. In one aspect, the frequency response of a forward link is estimated at a base station based on reverse link transmissions (e.g., pilots) from a terminal. Prior to a data transmission on the forward link, the base station determines a reverse transfer function based on the pilots transmitted by the terminal, “calibrates” the reverse transfer function with a calibration function to derive an estimate of a forward transfer function, and preconditions modulation symbols based on weights derived from the forward transfer function. In another aspect, the terminal estimates the “quality” of the forward link and provides this information to the base station. The base station then uses the information to properly code and modulate data prior to transmission such that the transmitted data can be received by the terminal at the desired level of performance.

摘要翻译： 在时分双工（TDD）通信系统中处理用于传输的数据的技术。 在一个方面，基于来自终端的反向链路传输（例如，导频）在基站处估计前向链路的频率响应。 在前向链路上的数据传输之前，基站基于终端发送的导频来确定反向传递函数，使用校准函数“校准”反向传递函数，以导出前向传递函数的估计，以及前提条件 基于从前向传递函数导出的权重的调制符号。 在另一方面，终端估计前向链路的“质量”，并将该信息提供给基站。 然后，基站使用该信息在发送之前对数据进行适当的编码和调制，使得所发送的数据能够以期望的性能水平由终端接收。

公开(公告)号：US07027523B2

公开(公告)日：2006-04-11

申请号：US09887225

申请日：2001-06-22

申请人： Ahmad Jalali ,  John E. Smee ,  Mark Wallace

发明人： Ahmad Jalali ,  John E. Smee ,  Mark Wallace

IPC分类号： H04L25/03

CPC分类号： H04L1/0032 ,  H04B7/0434 ,  H04B7/0626 ,  H04L1/0003 ,  H04L1/0013 ,  H04L1/0026 ,  H04L1/0034 ,  H04L1/06 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/03343 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426

摘要： Techniques to process data for transmission in a time division duplexed (TDD) communication system. In one aspect, the frequency response of a forward link is estimated at a base station based on reverse link transmissions (e.g., pilots) from a terminal. Prior to a data transmission on the forward link, the base station determines a reverse transfer function based on the pilots transmitted by the terminal, “calibrates” the reverse transfer function with a calibration function to derive an estimate of a forward transfer function, and preconditions modulation symbols based on weights derived from the forward transfer function. In another aspect, the terminal estimates the “quality” of the forward link and provides this information to the base station. The base station then uses the information to properly code and modulate data prior to transmission such that the transmitted data can be received by the terminal at the desired level of performance.

公开(公告)号：US20100074152A1

公开(公告)日：2010-03-25

申请号：US12547732

申请日：2009-08-26

申请人： Ahmad Jalali ,  John E. Smee ,  Mark Wallace

发明人： Ahmad Jalali ,  John E. Smee ,  Mark Wallace

IPC分类号： H04J3/00 ,  H04L27/28

CPC分类号： H04L1/0032 ,  H04B7/0434 ,  H04B7/0626 ,  H04L1/0003 ,  H04L1/0013 ,  H04L1/0026 ,  H04L1/0034 ,  H04L1/06 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/03343 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426

摘要： Techniques to process data for transmission in a time division duplexed (TDD) communication system. In one aspect, the frequency response of a forward link is estimated at a base station based on reverse link transmissions (e.g., pilots) from a terminal Prior to a data transmission on the forward link, the base station determines a reverse transfer function based on the pilots transmitted by the terminal, “calibrates” the reverse transfer function with a calibration function to derive an estimate of a forward transfer function, and preconditions modulation symbols based on weights derived from the forward transfer function. In another aspect, the terminal estimates the “quality” of the forward link and provides this information to the base station. The base station then uses the information to properly code and modulate data prior to transmission such that the transmitted data can be received by the terminal at the desired level of performance.

摘要翻译： 在时分双工（TDD）通信系统中处理用于传输的数据的技术。 在一个方面，基于来自终端的反向链路传输（例如，导频）在基站处估计前向链路的频率响应在前向链路上的数据传输之前，基站基于 由终端发送的导频，使用校准功能“校准”反向传递函数，以导出正向传递函数的估计，以及基于从前向传递函数导出的权重的前提条件调制符号。 在另一方面，终端估计前向链路的“质量”，并将该信息提供给基站。 然后，基站使用该信息在发送之前对数据进行适当的编码和调制，使得所发送的数据能够以期望的性能水平由终端接收。

公开(公告)号：US08121217B2

公开(公告)日：2012-02-21

申请号：US12547732

申请日：2009-08-26

申请人： Ahmad Jalali ,  John E. Smee ,  Mark Wallace

发明人： Ahmad Jalali ,  John E. Smee ,  Mark Wallace

IPC分类号： H04K1/02

CPC分类号： H04L1/0032 ,  H04B7/0434 ,  H04B7/0626 ,  H04L1/0003 ,  H04L1/0013 ,  H04L1/0026 ,  H04L1/0034 ,  H04L1/06 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0226 ,  H04L25/03343 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426

摘要： Techniques to process data for transmission in a time division duplexed (TDD) communication system. In one aspect, the frequency response of a forward link is estimated at a base station based on reverse link transmissions (e.g., pilots) from a terminal. Prior to a data transmission on the forward link, the base station determines a reverse transfer function based on the pilots transmitted by the terminal, “calibrates” the reverse transfer function with a calibration function to derive an estimate of a forward transfer function, and preconditions modulation symbols based on weights derived from the forward transfer function. In another aspect, the terminal estimates the “quality” of the forward link and provides this information to the base station. The base station then uses the information to properly code and modulate data prior to transmission such that the transmitted data can be received by the terminal at the desired level of performance.

摘要翻译： 在时分双工（TDD）通信系统中处理用于传输的数据的技术。 在一个方面，基于来自终端的反向链路传输（例如，导频）在基站处估计前向链路的频率响应。 在前向链路上的数据传输之前，基站基于终端发送的导频来确定反向传递函数，使用校准功能“校准”反向传递函数，以导出前向传递函数的估计，以及前提条件 基于从前向传递函数导出的权重的调制符号。 在另一方面，终端估计前向链路的“质量”，并将该信息提供给基站。 然后，基站使用该信息在发送之前对数据进行适当的编码和调制，使得所发送的数据能够以期望的性能水平由终端接收。

公开(公告)号：US07397844B2

公开(公告)日：2008-07-08

申请号：US11267070

申请日：2005-11-03

申请人： John E. Smee ,  Ahmad Jalali

发明人： John E. Smee ,  Ahmad Jalali

IPC分类号： H04B1/00

CPC分类号： H04B7/0854 ,  H04B1/7115 ,  H04L25/03019 ,  H04L2025/03617 ,  H04L2025/03662 ,  H04L2025/03777

摘要： In a method for achieving higher S/N, one or more signals are received and processed to provide one or more streams of samples. In a first processing scheme, the sample stream(s) are equalized within an equalizer to generate symbol estimates, which may be subsequently processed (e.g., despread and decovered) to provide a first stream of recovered symbols. Each sample stream is filtered with a set of coefficients and may be scaled with a scaling factor. The scaled samples for all streams are then combined to generate the symbol estimates. The sample stream(s) may also be processed by a second processing scheme with one or more rake receivers to provide a second stream of recovered symbols. The signal quality for each processing scheme can be estimated and used to select either the first or second processing scheme.

摘要翻译： 在用于实现更高S / N的方法中，接收和处理一个或多个信号以提供一个或多个采样流。 在第一处理方案中，在均衡器内均衡采样流以产生符号估计，其可以随后被处理（例如，解扩和解复用）以提供恢复符号的第一流。 用一组系数对每个采样流进行滤波，并可以用缩放因子进行缩放。 然后将所有流的缩放样本组合以生成符号估计。 样本流也可以由具有一个或多个耙式接收器的第二处理方案来处理，以提供第二回收符号流。 可以估计每个处理方案的信号质量并用于选择第一或第二处理方案。

公开(公告)号：US07082174B1

公开(公告)日：2006-07-25

申请号：US09624319

申请日：2000-07-24

申请人： John E. Smee ,  Ahmad Jalali

发明人： John E. Smee ,  Ahmad Jalali

IPC分类号： H04B1/10

CPC分类号： H04B7/0854 ,  H04B1/7115 ,  H04L25/03019 ,  H04L2025/03617 ,  H04L2025/03662 ,  H04L2025/03777

摘要： In a method for achieving higher S/N, one or more signals are received and processed to provide one or more streams of samples. In a first processing scheme, the sample stream(s) are equalized and combined within an equalizer to generate symbol estimates, which may be subsequently processed (e.g., despread and decovered) to provide a first stream of recovered symbols. The sample stream(s) may be equalized prior to being combined. In this case, each sample stream is filtered with a set of coefficients and may be scaled with a scaling factor. The scaled samples for all streams are then combined to generate the symbol estimates. Alternatively, the sample stream(s) may be combined prior to being equalized. In this case, each sample stream is scaled by a scaling factor. The scaled samples for all streams are then combined to generate summed samples that are further filtered with a set of coefficients to generate the symbol estimates. The sample stream(s) may also be processed by a second processing scheme with one or more rake receivers to provide a second stream of recovered symbols. The signal quality for each processing scheme can be estimated and used to select either the first or second processing scheme.

摘要翻译： 在用于实现更高S / N的方法中，接收和处理一个或多个信号以提供一个或多个采样流。 在第一处理方案中，在均衡器内均衡和组合采样流以产生符号估计，其可以随后被处理（例如，解扩和解复用）以提供第一回收符号流。 样品流可以在组合之前相等。 在这种情况下，用一组系数对每个样本流进行滤波，并且可以用缩放因子进行缩放。 然后将所有流的缩放样本组合以生成符号估计。 或者，样品流可以在均衡之前组合。 在这种情况下，每个采样流被缩放因子。 然后将所有流的经缩放的样本组合以产生用一组系数进一步滤波以产生符号估计的求和样本。 样本流也可以由具有一个或多个耙式接收器的第二处理方案来处理，以提供第二回收符号流。 可以估计每个处理方案的信号质量并用于选择第一或第二处理方案。

公开(公告)号：US20100142638A1

公开(公告)日：2010-06-10

申请号：US12704111

申请日：2010-02-11

申请人： Ahmad Jalali ,  Jay R. Walton ,  Mark Wallace

发明人： Ahmad Jalali ,  Jay R. Walton ,  Mark Wallace

IPC分类号： H04L27/28

CPC分类号： H04L5/023

摘要： Transmitter and receiver units for use in an OFDM communications system and configurable to support multiple types of services. The transmitter unit includes one or more encoders, a symbol mapping element, and a modulator. Each encoder receives and codes a respective channel data stream to generate a corresponding coded data stream. The symbol mapping element receives and maps data from the coded data streams to generate modulation symbol vectors, with each modulation symbol vector including a set of data values used to modulate a set of tones to generate an OFDM symbol. The modulator modulates the modulation symbol vectors to provide a modulated signal suitable for transmission. The data from each coded data stream is mapped to a respective set of one or more “circuits”. Each circuit can be defined to include a number of tones from a number of OFDM symbols, a number of tones from a single OFDM symbol, all tones from one or more OFDM symbols, or some other combination of tones. The circuits can have equal size or different sizes. Different circuits can be used for full rate data (e.g., active speech) and low rate data (e.g., silence periods).

摘要翻译： 发射机和接收机单元，用于OFDM通信系统并可配置为支持多种类型的业务。 发射机单元包括一个或多个编码器，符号映射元件和调制器。 每个编码器接收和编码相应的信道数据流以生成对应的编码数据流。 符号映射元件接收并映射来自编码数据流的数据以产生调制符号向量，其中每个调制符号向量包括用于调制一组音调以生成OFDM符号的一组数据值。 调制器调制调制符号向量以提供适于传输的调制信号。 来自每个编码数据流的数据被映射到一个或多个“电路”的相应集合。 每个电路可以被定义为包括来自多个OFDM符号的多个音调，来自单个OFDM符号的多个音调，来自一个或多个OFDM符号的所有音调，或一些其它音调组合。 电路可以具有相同的尺寸或不同的尺寸。 不同的电路可以用于全速率数据（例如，活动语音）和低速率数据（例如，静默时段）。

公开(公告)号：US20060093067A1

公开(公告)日：2006-05-04

申请号：US11298639

申请日：2005-12-08

申请人： Ahmad Jalali ,  Jay Walton ,  Mark Wallace

发明人： Ahmad Jalali ,  Jay Walton ,  Mark Wallace

IPC分类号： H04B7/06 ,  H04K1/10

CPC分类号： H04L5/023

摘要： Transmitter and receiver units for use in an OFDM communications system and configurable to support multiple types of services. The transmitter unit includes one or more encoders, a symbol mapping element, and a modulator. Each encoder receives and codes a respective channel data stream to generate a corresponding coded data stream. The symbol mapping element receives and maps data from the coded data streams to generate modulation symbol vectors, with each modulation symbol vector including a set of data values used to modulate a set of tones to generate an OFDM symbol. The modulator modulates the modulation symbol vectors to provide a modulated signal suitable for transmission. The data from each coded data stream is mapped to a respective set of one or more “circuits”. Each circuit can be defined to include a number of tones from a number of OFDM symbols, a number of tones from a single OFDM symbol, all tones from one or more OFDM symbols, or some other combination of tones. The circuits can have equal size or different sizes. Different circuits can be used for full rate data (e.g., active speech) and low rate data (e.g., silence periods).