公开(公告)号：US20070110178A1

公开(公告)日：2007-05-17

申请号：US11595618

申请日：2006-11-11

申请人： Ling Su ,  Joachim Hammerschmidt

发明人： Ling Su ,  Joachim Hammerschmidt

IPC分类号： H04K1/10

CPC分类号： H04K1/00 ,  H03M13/2707 ,  H03M13/31 ,  H03M13/41 ,  H03M13/6508 ,  H04L1/0002 ,  H04L1/0052 ,  H04L1/0071 ,  H04L1/04 ,  H04L1/06 ,  H04L27/2647

摘要： An integrated circuit radio transceiver and method therefor is operable to flexibly and efficiently de-interleave a received communication signal by initially changing a received signal from the time domain to the frequency domain to generate a plurality of tones that are then rearranged in a first de-interleaving step to an order expected by a downstream decoder. Thereafter, the tones are detected to generate a soft bit sequence and are then reverse-swizzled and de-interleaved. The de-interleaving step is performed in a manner that compensates for row/column offset interleaving performed by a transmitter that transmitted the received signal being processed.

摘要翻译： 集成电路无线电收发器及其方法可操作以通过初始地将接收到的信号从时域改变到频域来产生多个音调，从而灵活地和有效地对接收到的通信信号进行解交织， 交织步骤到下游解码器预期的顺序。 此后，检测音调以产生软比特序列，然后反向旋转并解交织。 解交织步骤以补偿由正在处理的发送接收信号的发送机执行的行/列偏移交织的方式来执行。

公开(公告)号：US20070036245A1

公开(公告)日：2007-02-15

申请号：US11498833

申请日：2006-08-04

申请人： Joachim Hammerschmidt

发明人： Joachim Hammerschmidt

IPC分类号： H04L27/06

CPC分类号： H04L25/067 ,  H04B1/406

摘要： Methods and systems for reconfigurable soft-output bit demapping, reconfigurable for different modes of operation (i.e., different transmitter/receiver configurations) and for different modulation schemes are provided. In an embodiment, a reconfigurable soft-output bit demapping system includes a mode/modulation independent equalizer, a plurality of mode/modulation independent soft-slicers coupled to the outputs of the equalizer, a plurality of mode/modulation independent post-scalers coupled to the outputs of the soft-slicers, and a mode-dependent coefficient calculator. The coefficient calculator generates parameters for configuring the equalizer, the soft-slicers, and the post-scalers according to the used mode of operation and modulation scheme.

公开(公告)号：US20050288062A1

公开(公告)日：2005-12-29

申请号：US10875157

申请日：2004-06-23

申请人： Joachim Hammerschmidt ,  John Veschi

发明人： Joachim Hammerschmidt ,  John Veschi

IPC分类号： H04B7/04 ,  H04B7/06 ,  H04L1/00 ,  H04L1/16 ,  H04L27/26 ,  H04M1/00

CPC分类号： H04L1/0002 ,  H04L1/0016 ,  H04L1/0025 ,  H04L1/1607 ,  H04L27/2602

摘要： A method and apparatus are provided for selecting a transmission mode based upon a length of at least a portion of a packet to be transmitted. A packet is transmitted in a multiple antenna communication system by selecting a transmission mode based on a length of at least a portion of the packet. The transmission mode can indicate a number of antennas or date rate (or both) to be used for the transmission. A transmission mode can also be selected based on, for example, (i) a mode selection table that records an expected transmission time for a packet for each supported transmission mode or (ii) one or more packet length thresholds each having a corresponding transmission mode. ACK (acknowledgment) packets can be transmitted using a predefined transmission mode, such as a SISO mode (or a lower order MIMO mode than the original packet), or based on a predefined relationship between the transmission mode of the original packet and the corresponding transmission mode that should be used to acknowledge the packet.

摘要翻译： 提供了一种方法和装置，用于基于要发送的分组的至少一部分的长度来选择传输模式。 通过基于分组的至少一部分的长度选择传输模式，在多天线通信系统中发送分组。 传输模式可以指示要用于传输的天线数量或日期速率（或两者）。 还可以基于例如（i）模式选择表来选择传输模式，该模式选择表记录用于每个支持的传输模式的分组的预期传输时间，或者（ii）一个或多个分组长度阈值，每个具有相应的传输模式 。 可以使用诸如SISO模式（或比原始分组更低阶MIMO模式）的预定义传输模式或者基于原始分组的传输模式与相应传输之间的预定关系来发送ACK（确认）分组 应该用于确认数据包的模式。

公开(公告)号：US20070110180A1

公开(公告)日：2007-05-17

申请号：US11595646

申请日：2006-11-11

申请人： Joachim Hammerschmidt ,  Ling Su

发明人： Joachim Hammerschmidt ,  Ling Su

IPC分类号： H04L1/02

CPC分类号： H04L1/0041 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0071 ,  H04L1/04 ,  H04L1/06

摘要： An integrated circuit radio transceiver and method therefor is operable to flexibly and efficiently interleave a digital bit stream arranged in a table characterized by N rows and N columns further including interleaving column and row bits in the table and frequency rotating interleaved bits in one interleaving step by extracting bits beginning at a row and column offset value specified for the table wherein the first extracted bit is not the first stored bit in the table. Subsequently, the transceiver and method are operable to swizzle interleaved and frequency rotated data bits extracted from the table. In one embodiment, the swizzling begins at a selectable and specified phase value. Further, a stream parser is configurable to produce any number of output streams based upon any number of input streams.

摘要翻译： 集成电路无线电收发机及其方法可操作以灵活和有效地交织布置在表格中的数字比特流，其特征在于N行和N列，其中进一步包括表中的交织列和行比特，并且在一个交织步骤中频率旋转交织比特 提取从为表指定的行和列偏移值开始的位，其中第一提取位不是表中的第一个存储位。 随后，收发器和方法可用于对从表中提取的交错和频率旋转数据比特进行转换。 在一个实施例中，旋转开始于可选择和指定的相位值。 此外，流解析器可配置为基于任何数量的输入流产生任何数量的输出流。

公开(公告)号：US20070077969A1

公开(公告)日：2007-04-05

申请号：US11525270

申请日：2006-09-22

申请人： Joseph Lauer ,  Joachim Hammerschmidt

发明人： Joseph Lauer ,  Joachim Hammerschmidt

IPC分类号： H04B7/00 ,  H04B1/02 ,  H04M1/00

CPC分类号： H04L1/0054 ,  H04L1/06

摘要： Maximum likelihood detection of signals in a MIMO receiver. A system transformation is obtained by selecting a weighting matrix that when linearly transforming a channel utilized for wireless communication, results in a particular transformed triangular matrix. The weighting matrix is then used to provide a transformed vector for a received signal that allows a search in one constellation. In searching the constellation recursion values are used to calculate the Euclidean distances between set points of the constellation and the location on the constellation corresponding to the received signal for both bit values 0 and 1. Minimum Euclidean distances are determined for bit values 0 and 1 and the difference of the minimum Euclidean distances is used to compute the maximum likelihood value for bits contained in the received signal.

摘要翻译： MIMO接收机中信号的最大似然检测。 通过选择加权矩阵获得系统变换，该加权矩阵当线性变换用于无线通信的信道时，得到特定的变换三角矩阵。 然后，加权矩阵用于为允许在一个星座中进行搜索的接收信号提供变换矢量。 在搜索星座递归值时，用于计算星座的设定点与位值0和1对应的接收信号对应的星座上的位置之间的欧氏距离。对于位值0和1确定最小欧几里得距离， 使用最小欧几里德距离的差来计算接收信号中包含的位的最大似然值。

公开(公告)号：US20070002878A1

公开(公告)日：2007-01-04

申请号：US11433997

申请日：2006-05-15

申请人： Rajendra Moorti ,  Jason Trachewsky ,  Joachim Hammerschmidt ,  Ling Su

发明人： Rajendra Moorti ,  Jason Trachewsky ,  Joachim Hammerschmidt ,  Ling Su

IPC分类号： H04L12/56 ,  H04J3/22

CPC分类号： H04L1/0068 ,  H04L1/0001 ,  H04L1/0041 ,  H04L1/0054 ,  H04L1/0071 ,  H04L1/0083

摘要： A multi-protocol wireless communication baseband transceiver includes a baseband transmit processing module and a baseband receive processing module. The baseband transmit processing module includes an encoding module, an interleaving module, a plurality of symbol mapping modules, a plurality of domain conversion modules, a plurality of cyclic prefix modules, a plurality of compensation modules, and a control module that is operably coupled to produce preamble set up information and payload set up information based on a mode of a plurality of protocol modes. The baseband receive processing module includes a plurality of receive compensation modules, a plurality of cyclic prefix removal modules, a plurality of receive domain conversion modules, an equalizing module, a plurality of demapping modules, a deinterleaving module, a decoding module, and a receive control module that is operably coupled to determine the mode from the plurality of protocol modes and the compensation control signals based on the at least one compensated stream of symbols.

摘要翻译： 多协议无线通信基带收发器包括基带发射处理模块和基带接收处理模块。 基带发送处理模块包括编码模块，交织模块，多个符号映射模块，多个域转换模块，多个循环前缀模块，多个补偿模块以及可操作地耦合到 基于多个协议模式的模式产生前导码建立信息和有效负载建立信息。 基带接收处理模块包括多个接收补偿模块，多个循环前缀去除模块，多个接收域转换模块，均衡模块，多个解映射模块，解交织模块，解码模块和接收器 控制模块，其可操作地耦合以基于所述至少一个经补偿的符号流来确定来自所述多个协议模式的模式和所述补偿控制信号。

公开(公告)号：US20060269003A1

公开(公告)日：2006-11-30

申请号：US11141271

申请日：2005-05-31

申请人： Joachim Hammerschmidt ,  Xiaowen Wang

发明人： Joachim Hammerschmidt ,  Xiaowen Wang

IPC分类号： H04K1/10

CPC分类号： H04L27/2647 ,  H04L25/06

摘要： Methods and systems are provided for estimating the DC offset distortion in a receiver. A fast Fourier transform is applied to at least a portion of a preamble portion of the received signal; an impact of the DC offset distortion on one or more empty subcarriers is determined; individual DC estimates are derived based on each of the determinations; and each of the individual DC estimates are combined to obtain an overall DC estimate.

摘要翻译： 提供了用于估计接收机中的DC偏移失真的方法和系统。 快速傅里叶变换被应用于接收信号的前导码部分的至少一部分; 确定DC偏移失真对一个或多个空子载波的影响; 基于每个测定得出个体直流估计值; 并且将每个单独的DC估计值组合以获得总体DC估计。

公开(公告)号：US20060209994A1

公开(公告)日：2006-09-21

申请号：US11085025

申请日：2005-03-16

申请人： Nils Graef ,  Joachim Hammerschmidt

发明人： Nils Graef ,  Joachim Hammerschmidt

IPC分类号： H04L27/06

CPC分类号： H04L25/067 ,  H04L27/2601 ,  H04L27/38

摘要： A method for detecting a symbol encoded in one or more received signals, wherein the detected symbol corresponds to a combination of values of n components, n>1, comprises (a) for each of a plurality of different combinations of values of the n components, generating a set of two or more sub-metric values based on the one or more received signals. Each sub-metric is a function of one or more of the n components, and at least one sub-metric is a function of fewer than all n components. The method further comprises (b) detecting the symbol based on the sets of sub-metric values. In another embodiment, an apparatus for detecting a symbol encoded in one or more received signals, wherein the detected symbol corresponds to a combination of values of n components, n>1, comprises (a) means for generating a set of two or more sub-metric values based on the one or more received signals for each of a plurality of different combinations of values of the n components. Each sub-metric is a function of one or more of the n components, and at least one sub-metric is a function of fewer than all n components. The apparatus further comprises (b) means for detecting the symbol based on the sets of sub-metric values.

摘要翻译： 一种用于检测在一个或多个接收信号中编码的符号的方法，其中所述检测到的符号对应于n个分量值n> 1的值的组合，包括（a）对于n个分量的值的多个不同组合中的每一个 基于所述一个或多个接收到的信号产生一组两个或更多个子度量值。 每个子度量是n个分量中的一个或多个的函数，并且至少一个子度量是少于全部n个分量的函数。 该方法还包括（b）基于子度量值集合来检测符号。 在另一个实施例中，一种用于检测在一个或多个接收信号中编码的符号的装置，其中所检测的符号对应于n个分量n> 1的值的组合，包括（a）用于生成一组两个或更多个子 基于用于n个分量的值的多个不同组合中的每一个的一个或多个接收信号的测量值。 每个子度量是n个分量中的一个或多个的函数，并且至少一个子度量是少于全部n个分量的函数。 该装置还包括（b）用于基于子度量值集合来检测符号的装置。

公开(公告)号：US20050163236A1

公开(公告)日：2005-07-28

申请号：US10990143

申请日：2004-11-16

申请人： Joachim Hammerschmidt ,  Robert Kopmeiners ,  Xiaowen Wang

发明人： Joachim Hammerschmidt ,  Robert Kopmeiners ,  Xiaowen Wang

IPC分类号： H04J99/00 ,  H04B7/06 ,  H04L1/06 ,  H04L27/26 ,  H04K1/10

CPC分类号： H04L1/06 ,  H04B7/0671

摘要： A method and apparatus are disclosed for transmitting symbols in a multiple antenna communication system. The disclosed frame structure comprises a preamble having a plurality of long training symbols that are transmitted on a plurality transmit antennas. At least a portion of the frame is delayed on at least one transmit antenna. The disclosed frame formats of the present invention are backwards compatible to existing single antenna communication systems. The delay amount, D, can be approximately equal to one OFDM time sample period, T. The delayed version can be obtained by introducing a time delay into a signal on the delayed branch(es) or by cyclically shifting at least a portion of each frame on the delayed branch(es). The entire frame or only the preamble portion of each frame can be delayed.

摘要翻译： 公开了用于在多天线通信系统中发送符号的方法和装置。 所公开的帧结构包括具有在多个发射天线上发射的多个长训练符号的前同步码。 帧的至少一部分在至少一个发射天线上被延迟。 所公开的本发明的帧格式向后兼容于现有的单一天线通信系统。 延迟量D可以近似等于一个OFDM时间采样周期T.延迟版本可以通过在延迟分支上的信号中引入时间延迟或者通过周期性地移位每个 在延迟分支上的框架。 每个帧的整个帧或仅前导码部分可以被延迟。

公开(公告)号：US08290450B2

公开(公告)日：2012-10-16

申请号：US12939600

申请日：2010-11-04

申请人： Joachim Hammerschmidt ,  Rajendra Moorti

发明人： Joachim Hammerschmidt ,  Rajendra Moorti

IPC分类号： H04B1/04 ,  H04B17/00 ,  H03C1/62

CPC分类号： H04B17/21

摘要： Methods and systems for calibrating a transmitter with I/Q imbalance and local oscillator feed-through include generating a test tone, frequency up-converting the test tone, monitoring one or more features of the up-converted test tone, and adjusting one or more features of the transmitter in response to the monitoring. The monitoring optionally includes monitoring a beating of the envelope of the up-converted test tone. In an embodiment, a first harmonic of the up-converted test tone is monitored for local oscillator feed-through (LOFT). Alternatively, baseband data inputs to the transmitter are disabled, and LOFT is measured by measuring power at the transmitter output. A second harmonic of the up-converted test tone is monitored for gain and phase imbalances. The adjusting optionally includes adjusting a gain imbalance, adjusting a phase imbalance, and/or adjusting a DC offset. The adjusting optionally includes an iterative refinement process.

摘要翻译： 用于校准具有I / Q不平衡和本地振荡器馈通的发射机的方法和系统包括产生测试音，上变频测试音，监测升高的测试音的一个或多个特征，以及调整一个或多个 变送器的功能响应监控。 该监视可选地包括监视向上转换的测试音的包络的跳动。 在一个实施例中，监视上转换的测试音的一次谐波用于本地振荡器馈通（LOFT）。 或者，对发射机的基带数据输入被禁用，并且通过测量发射机输出端的功率来测量LOFT。 监控上变频测试音的二次谐波，以获得增益和相位不平衡。 调整可选地包括调整增益不平衡，调整相位不平衡和/或调整DC偏移。 调整可选地包括迭代细化过程。