公开(公告)号：US20150236763A1

公开(公告)日：2015-08-20

申请号：US14263766

申请日：2014-04-28

Applicant: Broadcom Corporation

Inventor： David Garrett ,  Jun Zheng ,  Nihar Jindal

IPC: H04B7/04 ,  H04B7/12 ,  H04L25/02

CPC classification number: H04B7/0617 ,  H04B7/0408 ,  H04B7/0452 ,  H04B7/0626 ,  H04B7/12 ,  H04L1/06 ,  H04L1/0618 ,  H04L25/0204 ,  H04L25/0224 ,  H04L25/0228

Abstract: In some aspects, the disclosure is directed to methods and systems for performing channel estimation between a beamformer and a beamformee. A beamformer can determine that a beamformee is configured to perform channel estimation for up to a pre-configured number of transmit spatial streams from the beamformer. The pre-configured number of transmit spatial streams can be less than a plurality of transmit spatial streams of the beamformer. The beamformer can determine a plurality of subsets of transmit spatial streams from the plurality of transmit spatial streams. The beamformer can send a plurality of sounding frames to the beamformee for channel estimation based at least on the determined plurality of subsets of transmit spatial streams.

Abstract translation: 在一些方面，本公开涉及用于在波束形成器和波束形成器之间执行信道估计的方法和系统。 波束形成器可以确定波束形成器被配置为执行来自波束形成器的高达预配置数量的发射空间流的信道估计。 预配置的发射空间流数可以小于波束形成器的多个发射空间流。 波束形成器可以从多个发射空间流中确定发射空间流的多个子集。 波束形成器可以至少基于确定的多个传输空间流子集，向波束形成器发送多个探测帧用于信道估计。

公开(公告)号：US20150236411A1

公开(公告)日：2015-08-20

申请号：US14275291

申请日：2014-05-12

Applicant: Broadcom Corporation

Inventor： David Garrett ,  Jun Zheng ,  Nihar Jindal

IPC: H01Q3/24 ,  H04L5/00

CPC classification number: H01Q3/24 ,  H04B7/0617 ,  H04B7/0689 ,  H04L5/0048

Abstract: In some aspects, the disclosure is directed to methods and systems for transmitting to static and non-static devices. An access point having a plurality of antennas can send a plurality of sounding frames from the plurality of antennas to a plurality of devices. The access point can identify, based on responses to the plurality of sounding frames, at least one static device from the plurality of devices. The access point can assign, based on the responses to the plurality of sounding frames, to each of the at least one static device, a corresponding one of the plurality of antennas for operation in a directional mode for transmissions to the corresponding static device, and the remaining antennas from the plurality of antennas for operation in an omnidirectional mode.

Abstract translation: 在一些方面，本公开涉及用于传送到静态和非静态设备的方法和系统。 具有多个天线的接入点可以将多个探测帧从多个天线发送到多个设备。 接入点可以基于对多个探测帧的响应来识别来自多个设备的至少一个静态设备。 所述接入点可以基于对所述多个探测帧的响应，将所述至少一个静态设备中的每一个分配给所述多个天线中的相应一个天线，用于以定向模式操作以传输到相应的静态设备，以及 来自多个天线的剩余天线用于全向模式的操作。

公开(公告)号：US20160173305A1

公开(公告)日：2016-06-16

申请号：US15052337

申请日：2016-02-24

Applicant: BROADCOM CORPORATION

Inventor： Jun Zheng ,  Min Chuin Hoo ,  Vinko Erceg

IPC: H04L27/227 ,  H04B7/08

CPC classification number: H04L27/227 ,  H04B7/084 ,  H04L5/0026 ,  H04L5/0048 ,  H04L25/03866 ,  H04L27/20 ,  H04L27/2613 ,  H04L27/2621

Abstract: Phase rotation for preambles within multiple user, multiple access, and/or MIMO wireless communications. An appropriately designed phase rotation vector and/or appropriately designed cyclic shift delays (CSDs) are applied to respective sub-band components of the preamble. With appropriately designed CSDs, certain fields within the preamble are not modified. For example, a legacy short training field (L-STF) of the preamble is not changed when using appropriately designed CSDs. The respective CSDs may be implemented as integer multiples of a common CSD (e.g., 0×CSD, 1×CSD, 2×CSD, etc. such that one of the values of such a CSD vector may be zero [0], another may be the common CSD itself, etc.). Also, by employing an appropriately designed phase rotation vector and integer multiples of a CSD to a preamble, the respective peak to average power ratio (PAPR) between different respective fields within the preamble may be minimized.

公开(公告)号：US09351179B2

公开(公告)日：2016-05-24

申请号：US14268677

申请日：2014-05-02

Applicant: Broadcom Corporation

Inventor： David Garrett ,  Nihar Jindal ,  Jun Zheng

IPC: H04W24/02 ,  H04L25/02

CPC classification number: H04W24/02 ,  H04L25/0222 ,  H04L25/0224 ,  H04L25/0228 ,  H04W8/005 ,  H04W48/12

Abstract: Systems and methods can analyze a present channel estimation and a previous channel estimation and/or two or more prior channel estimations to improve communication performance, sense environmental conditions, and make location and velocity determinations. The methods can include: (a) sending, by a transmitter, a first sounding frame and a second sounding frame to a receiver; (b) receiving, by the transmitter, a first channel estimation response from a receiver responsive to the first sounding frame, and a second channel estimation response from the receiver responsive to the second sounding frame; and (c) detecting, by the transmitter, based at least on the first channel estimation response and the second channel estimation response, if a change in characteristics of a channel between the transmitter and the receiver occurred between the first sounding frame and the second sounding frame.

Abstract translation: 系统和方法可以分析当前信道估计和先前的信道估计和/或两个或多个先前的信道估计，以改善通信性能，感测环境条件，并进行位置和速度确定。 所述方法可以包括：（a）由发射机向接收机发送第一探测帧和第二探测帧; （b）由所述发射机响应于所述第一探测帧接收来自接收机的第一信道估计响应，以及响应于所述第二探测帧的来自所述接收机的第二信道估计响应; 以及（c）至少基于第一信道估计响应和第二信道估计响应，由发射机检测发射机和接收机之间的信道的特性的变化是否发生在第一探测帧和第二探测帧之间 帧。

公开(公告)号：US20150222406A1

公开(公告)日：2015-08-06

申请号：US14248220

申请日：2014-04-08

Applicant: BROADCOM CORPORATION

Inventor： Jun Zheng ,  Nihar Jindal ,  David Christopher Garrett

IPC: H04L5/00 ,  H04B7/06 ,  H04B7/04

CPC classification number: H04L5/0055 ,  H04B7/0417 ,  H04B7/0452 ,  H04B7/0626 ,  H04L1/1685 ,  H04L1/1825 ,  H04L5/0057

Abstract: A method for improving multiple-user (MU) multiple-input-multiple-output (MIMO) acknowledge (ACK) protocol efficiency includes: receiving a sounding frame from a device, sending a feedback response, which includes quantized channel state information (CSI) to the device, receiving an MU physical-layer protocol data unit (PPDU) frame from the device, and in response to receiving the MU PPDU frame, sending an ACK frame to the device without receiving a polling frame prior to the ACK frame.

Abstract translation: 一种用于改善多用户（MU）多输入多输出（MIMO）确认（ACK）协议效率的方法包括：从设备接收探测帧，发送反馈响应，其包括量化信道状态信息（CSI） 向设备接收来自设备的MU物理层协议数据单元（PPDU）帧，并且响应于接收到MU PPDU帧，在ACK帧之前不接收到轮询帧来向设备发送ACK帧。

公开(公告)号：US20140160957A1

公开(公告)日：2014-06-12

申请号：US13730771

申请日：2012-12-28

Applicant: BROADCOM CORPORATION

Inventor： Jun Zheng ,  Nihar Jindal ,  Sirikiat Ariyavisitakul ,  Eric Ojard

IPC: H04W24/02

CPC classification number: H04W24/02 ,  H04L5/0048 ,  H04L25/0224 ,  H04W24/06

Abstract: A dedicated calibration device may be utilized by a wireless transceiver device, such as a base station, to compute compensation matrices. The wireless transceiver device and the dedicated calibration device can exchange training sequence signals. Based on the exchanged training sequence signals, the wireless transceiver device and the dedicated calibration device can estimate overall baseband to baseband channel responses taking into account the amplitude and phase responses of the respective transmit and receive radio chains, and the wireless transceiver device can determine the compensation matrices. Furthermore, the wireless transceiver device can estimate a baseband-to-baseband uplink channel response relative to actual user equipment, approximate a downlink channel response using only one of the determined compensation matrices, and perform beamforming to the actual user equipment using the approximated downlink channel response.

Abstract translation: 专用校准装置可以由无线收发器装置（例如基站）利用来计算补偿矩阵。 无线收发器装置和专用校准装置可以交换训练序列信号。 基于交换的训​​练序列信号，无线收发器设备和专用校准设备可以考虑到相应的发射和接收无线电链的幅度和相位响应来估计总体基带到基带信道响应，并且无线收发器设备可以确定 补偿矩阵。 此外，无线收发器设备可以估计相对于实际用户设备的基带到基带上行链路信道响应，仅使用所确定的补偿矩​​阵之一近似下行链路信道响应，并且使用近似下行链路信道对实际用户设备执行波束成形 响应。

公开(公告)号：US20130315169A1

公开(公告)日：2013-11-28

申请号：US13954492

申请日：2013-07-30

Applicant: BROADCOM CORPORATION

Inventor： Ron Porat ,  Jun Zheng

IPC: H04L5/00

CPC classification number: H04B7/0413 ,  H04B2201/70706 ,  H04L27/2621 ,  H04L27/2666 ,  H04W84/12 ,  Y02B80/50 ,  Y02D70/00 ,  Y02D70/142 ,  Y02D70/144

Abstract: Selective processing of one or more packets to be transmitted from a wireless communication device to another wireless communication device is effective to reduce the peak to average power ratio (PAPR) of the transmission. The one or more packets are transmitted via two or more sub-bands of an available transmission medium. The number of coefficients or factors within that sequence corresponds to the number of sub-bands via which the one or more packets are to be transmitted. Also, a phase ramp or time-domain cyclic shift may be added to one or more of the packets after having undergone multiplication by one of the coefficients or factors within the sequence.

Abstract translation: 要从无线通信设备发送到另一无线通信设备的一个或多个分组的选择性处理有效地降低传输的峰均功率比（PAPR）。 一个或多个分组经由可用传输介质的两个或多个子带传输。 该序列中的系数或因子的数量对应于要发送一个或多个分组的子带的数量。 而且，相位斜坡或时域循环移位可以在已经经过序列中的一个系数或因子的乘积之后被添加到一个或多个分组中。

公开(公告)号：US20130022001A1

公开(公告)日：2013-01-24

申请号：US13624511

申请日：2012-09-21

Applicant: Broadcom Corporation

Inventor： Chengjin ZHANG ,  Jun Zheng ,  Vinko Erceg ,  Severine Catreux-Erceg ,  Pieter Roux ,  Pieter Van Rooyen

IPC: H04W4/06

CPC classification number: H04B7/0452 ,  H04B17/382 ,  H04W52/42

Abstract: Various aspects of a method and a system for a range reduction scheme for user selection in a multiuser MIMO downlink transmission are presented. Aspects of a system for range reduction may comprise a range reduction processor that determines a plurality of channel measurements corresponding to a plurality of signals. The range reduction processor may compute a plurality of channel capacities based on the channel measurements corresponding to a subset of the plurality of signals having channel gain that is greater than a remaining portion of the plurality of signals. Aspects of a method may comprise determining a plurality of channel measurements corresponding to a plurality of signals, and computing a plurality of channel capacities based on said channel measurements corresponding to a subset of the plurality of signals having a channel gain that is greater than a remaining portion of the plurality of signals.

Abstract translation: 提出了一种用于多用户MIMO下行链路传输中的用户选择的范围缩减方案的方法和系统的各个方面。 用于范围缩小的系统的方面可以包括范围缩小处理器，其确定对应于多个信号的多个信道测量。 范围缩小处理器可以基于与具有大于多个信号的剩余部分的信道增益的多个信号的子集相对应的信道测量来计算多个信道容量。 方法的方面可以包括：确定对应于多个信号的多个信道测量，以及基于与多个信号的子集相对应的所述信道测量来计算多个信道容量，该信道测量具有大于剩余的信道增益的信道增益 部分信号。