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：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。

公开(公告)号：US20070025433A1

公开(公告)日：2007-02-01

申请号：US11396632

申请日：2006-04-04

申请人： Joachim Hammerschmidt ,  Rajendra Moorti

发明人： Joachim Hammerschmidt ,  Rajendra Moorti

IPC分类号： H04B17/00

CPC分类号： H04B17/21

摘要： Methods and systems to calibrating a transmitter for 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 DC offsets. The adjusting optionally includes an iterative refinement process. Such a refinement process optionally includes performing a first monitoring, applying a set of relatively coarse settings to the one or more features in the transmitter, monitoring the beating resulting from each of the coarse settings, selecting the coarse setting corresponding the smallest beating, applying a set of relatively fine settings centered around the selected coarse setting, wherein the fine settings are more closely related to one another than are the coarse settings, monitoring the beating resulting from each of the fine settings, and selecting the fine setting corresponding the smallest beating.

摘要翻译： 用于校准发射机以用于I / Q不平衡和本地振荡器馈通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。 该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。 这样的细化处理可选地包括执行第一监视，将一组相对粗略的设置应用于发射机中的一个或多个特征，监视由每个粗略设置产生的跳动，选择对应于最小跳动的粗略设置，应用 以选择的粗略设置为中心的相对精细设置的集合，其中精细设置比粗略设置彼此更紧密地相关，监视由每个精细设置产生的打击，并且选择对应于最小跳动的精细设置。

公开(公告)号：US20100246656A1

公开(公告)日：2010-09-30

申请号：US12659485

申请日：2010-03-10

申请人： Joachim Hammerschmidt

发明人： Joachim Hammerschmidt

IPC分类号： H04L27/01

CPC分类号： H04B1/406 ,  H04L25/03127 ,  H04L25/067

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：US07636401B2

公开(公告)日：2009-12-22

申请号：US11498833

申请日：2006-08-04

申请人： Joachim Hammerschmidt

发明人： Joachim Hammerschmidt

IPC分类号： H04B7/02 ,  H04L1/02

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.

摘要翻译： 提供了用于可重新配置的软输出位解映射，用于不同操作模式（即，不同的发射机/接收机配置）和不同调制方案的可重新配置的方法和系统。 在一个实施例中，可重新配置的软输出位解映射系统包括模式/调制独立均衡器，耦合到均衡器的输出的多个模式/调制无关软限幅器，耦合到 软切片器的输出和模式相关系数计算器。 系数计算器根据使用的操作模式和调制方案产生用于配置均衡器，软分片器和后定标器的参数。

公开(公告)号：US07096041B2

公开(公告)日：2006-08-22

申请号：US10296546

申请日：2001-05-17

申请人： Christopher Brunner ,  Martin Haardt ,  Joachim Hammerschmidt ,  Alexander Seeger

发明人： Christopher Brunner ,  Martin Haardt ,  Joachim Hammerschmidt ,  Alexander Seeger

IPC分类号： H04B1/38 ,  H04M1/00

CPC分类号： H04B7/0634 ,  H04B7/0617 ,  H04B7/065

摘要： In a radio communication system, a beam is formed between subscriber stations and a base station which has an antenna device with several antenna elements. The antenna elements emit a downlink signal based on respective weighing with coefficients of a weighting vector. A plurality of weighting vectors are determined at the subscriber station in an initialization phase and transmitted to the base station. In a subsequent working phase, the subscriber station selects a dominant weighting vector from the weighting vectors and transmits a designation of the selected weighting vector to the base station.

公开(公告)号：US20060104390A1

公开(公告)日：2006-05-18

申请号：US10990910

申请日：2004-11-17

申请人： Nils Graef ,  Joachim Hammerschmidt

发明人： Nils Graef ,  Joachim Hammerschmidt

IPC分类号： H03D1/00

CPC分类号： H04L25/03191 ,  H04B7/0413 ,  H04L5/0023 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0321 ,  H04L25/03318 ,  H04L27/2647 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03643

摘要： A wireless receiver detects signals generated with a multiple-input, multiple-output (MIMO) transmitter. The receiver applies maximum-likelihood detection (MLD) for soft-output signal detection, where an MLD exhaustive search across all candidate vectors is performed recursively by computing and accumulating the differences between, for example, the Euclidean metrics of consecutive candidate tests. Difference terms used for the accumulation are also calculated recursively. An ordering of candidates, such as by a triangular-waveform shaped ordering, is employed such that only one candidate variable is changed between any two consecutive candidate evaluations, leading to a reduced set of computations.

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：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。