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1. 发明申请

US20060274852A1 Modified preamble for programmable transmitter 有权
公开(公告)号：US20060274852A1
公开(公告)日：2006-12-07
申请号：US11403094
申请日：2006-04-11
申请人： Jason Trachewsky , Rajendra Moorti , Christopher Hansen
发明人： Jason Trachewsky , Rajendra Moorti , Christopher Hansen
IPC分类号： H04L27/00
CPC分类号： H04L27/2613 , H04L1/0002 , H04L1/0025 , H04L1/06
摘要： A programmable transmitter generates a frame preamble to train a receiver with respect to a communication link format that corresponds to a transmission mode wherein the transmission mode may comprise transmitting the communication link over one or more antennas. Generally, the invention includes generating a preamble with an arrangement that depends upon whether a Greenfield (high data rate) or mixed mode transmission is to occur and that depends upon a number of spatial streams that are to be generated. One format for high data rate transmission includes a short training sequence, a long training sequence and a signal field. The mixed mode transmission further includes a legacy prefix.

2. 发明申请

US20050180386A1 Device and method for transmitting long training sequence for wireless communications 有权
标题翻译：用于发送无线通信长训练序列的装置和方法
公开(公告)号：US20050180386A1
公开(公告)日：2005-08-18
申请号：US11056157
申请日：2005-02-14
申请人： Christopher Hansen , Jason Trachewsky , Rajendra Moorti
发明人： Christopher Hansen , Jason Trachewsky , Rajendra Moorti
IPC分类号： H04J3/06
CPC分类号： H04L27/2613
摘要： A device and method transmits a frame of a wireless communication. The frame includes a preamble that includes a short training sequence and a long training sequence. The long training sequence includes non-zero energy on each of a plurality of subcarriers except a DC subcarrier. A frequency domain window is inserted into the long training sequence to stimulate the subcarriers for channel estimation.
摘要翻译：一种设备和方法发送无线通信的帧。帧包括包括短训练序列和长训练序列的前同步码。长训练序列包括除了DC副载波之外的多个子载波中的每一个上的非零能量。将频域窗口插入到长训练序列中，以刺激子载波进行信道估计。

3. 发明申请

US20050180525A1 Method and system for encoding a signal for wireless communications 失效
标题翻译：用于编码无线通信信号的方法和系统
公开(公告)号：US20050180525A1
公开(公告)日：2005-08-18
申请号：US11056159
申请日：2005-02-14
申请人： Christopher Hansen , Jason Trachewsky , Rajendra Moorti
发明人： Christopher Hansen , Jason Trachewsky , Rajendra Moorti
IPC分类号： H04L27/12 , H04L27/20
CPC分类号： H03M13/2906 , H03M13/1102 , H03M13/1515 , H03M13/2936 , H03M13/2957 , H03M13/6362 , H04L1/0065 , H04L1/0071 , H04L27/2627
摘要： Method and system encodes a signal according to a code rate that includes a ratio of uncoded bits to coded bits. An outer Reed-Solomon encoder encodes the signal into codewords. An interleaver converts the codewords into bits of frames for wireless transmission. An inner encoder executes a convolutional code to generate an encoded signal. The encoded signal is transmitted over a plurality of subcarriers associated with a wide bandwidth channel. The convolutional code is punctured and code states are added by the inner encoder to improve the code rate.
摘要翻译：方法和系统根据包括未编码位与编码位的比率的码率对信号进行编码。外部Reed-Solomon编码器将信号编码成码字。交织器将码字转换成用于无线传输的帧的比特。内部编码器执行卷积码以产生编码信号。经编码的信号在与宽带宽信道相关的多个子载波上传输。卷积码被打孔，内编码器加上码状态，以提高码率。

4. 发明申请

US20060182017A1 Method and system for compromise greenfield preambles for 802.11n 有权
公开(公告)号：US20060182017A1
公开(公告)日：2006-08-17
申请号：US11151772
申请日：2005-06-09
申请人： Christopher Hansen , Rajendra Moorti , Jason Trachewsky
发明人： Christopher Hansen , Rajendra Moorti , Jason Trachewsky
IPC分类号： H04J11/00 , H04B7/00
CPC分类号： H04B7/0667 , H04B7/02 , H04B7/024 , H04B7/028 , H04B7/0404 , H04B7/0413 , H04B7/0452 , H04B7/0486 , H04B7/0495 , H04B7/0669 , H04L5/0026 , H04L5/0048 , H04L5/005 , H04L5/0051 , H04L5/0053 , H04L25/0226 , H04L25/03929 , H04L27/2613 , H04L29/06102 , H04L29/0653 , H04L29/0863 , H04L67/147 , H04L69/161 , H04W52/0225 , H04W52/52 , H04W84/12 , Y02D70/142 , Y02D70/442
摘要： Aspects of the invention described herein may enable a greenfield access mode in IEEE 802.11n WLAN systems in comparison to an alternative approach that may not provide greenfield access. The utilization of greenfield access may reduce the portion of time required to transmit data due to overhead comprising preamble fields and header fields. This may enable higher data throughput rates to be achieved. This may further enable more robust transmission of data by enabling comparable data rates to be maintained while reducing the coding rate of encoded transmitted data. The reduction of the coding rate may enable comparable data rates to be maintained for transmission via RF channels characterized by lower SNR while still achieving desired target levels of packet error rates. In another aspect of the invention, mixed mode access may be achieved while reducing the portion of time required for transmitting data due to overhead.

5. 发明申请

US20050204258A1 Encoding system and method for a transmitter in wireless communications 审中-公开
标题翻译：用于无线通信中发射机的编码系统和方法
公开(公告)号：US20050204258A1
公开(公告)日：2005-09-15
申请号：US11056154
申请日：2005-02-14
申请人： Christopher Hansen , Jason Trachewsky , Rajendra Moorti
发明人： Christopher Hansen , Jason Trachewsky , Rajendra Moorti
IPC分类号： H03M13/00 , H04B1/69 , H04B1/707 , H04B1/713
CPC分类号： H04B7/0689 , H03M13/1102 , H03M13/1515 , H03M13/27 , H03M13/2906 , H03M13/2936 , H03M13/2966 , H03M13/6362 , H04W84/12
摘要： Method and system encodes a signal according to a code rate that includes a ratio of uncoded bits to coded bits. An outer encoder encodes the signal into code words. An interleaver converts the code words into a byte sequence for wireless transmission. An inner encoder executes a convolutional code to generate an encoded signal. The encoded signal is transmitted over a plurality of subcarriers associated with a wide bandwidth channel having a spectral efficiency associated with the code rate. The outer encoder includes a Reed-Solomon encoder having a rate that increases the code rate of uncoded bits to coded bits.
摘要翻译：方法和系统根据包括未编码位与编码位的比率的码率对信号进行编码。外部编码器将信号编码为码字。交织器将码字转换成用于无线传输的字节序列。内部编码器执行卷积码以产生编码信号。经编码的信号在与具有与码率相关联的频谱效率的宽带宽信道相关联的多个子载波上传输。外部编码器包括具有将未编码比特的码率增加到编码比特的速率的里德 - 所罗门编码器。

6. 发明申请

US20050180361A1 Long training sequence method and device for wireless communications 有权
标题翻译：无线通信长训练序列方法及装置
公开(公告)号：US20050180361A1
公开(公告)日：2005-08-18
申请号：US11056156
申请日：2005-02-14
申请人： Christopher Hansen , Jason Trachewsky , Rajendra Moorti
发明人： Christopher Hansen , Jason Trachewsky , Rajendra Moorti
IPC分类号： H04Q7/00
CPC分类号： H04L5/0023 , H04L5/0048 , H04L27/2613
摘要： A method and device for transmitting a frame of a wireless communication begins by generating a preamble of the frame that includes a short training sequence and at least one long training sequence. The at least one long training sequence includes non-zero energy on each of a plurality of subcarriers except a DC subcarrier. The at least one long training sequence corresponds to the number of antennas and applicable wireless communication standards. A matrix is defined to represent the at least one long training sequence. The preamble is compatible with legacy and current standards. A channel is defined with a set of sub carriers to transmit the frame.
摘要翻译：用于发送无线通信的帧的方法和设备开始于生成包括短训练序列和至少一个长训练序列的帧的前导码。所述至少一个长训练序列在除了DC副载波之外的多个子载波中的每一个上都包括非零能量。至少一个长训练序列对应于天线的数量和适用的无线通信标准。矩阵被定义为表示至少一个长训练序列。序言与传统和当前标准兼容。用一组子载波来定义信道以发送帧。

7. 发明申请

US20050185730A1 Asymmetrical multiple stream wireless communication using STBC 有权
标题翻译：使用STBC的不对称多流无线通信
公开(公告)号：US20050185730A1
公开(公告)日：2005-08-25
申请号：US11057842
申请日：2005-02-15
申请人： Christopher Hansen , Joonsuk Kim , Rajendra Moorti , Nambirajan Seshadri , Jason Trachewsky
发明人： Christopher Hansen , Joonsuk Kim , Rajendra Moorti , Nambirajan Seshadri , Jason Trachewsky
IPC分类号： H04L1/02
CPC分类号： H04L1/0066 , H04L1/0643 , H04L1/065 , H04L1/1671
摘要： A method of communicating data to M receiving antennas from N transmitting antennas, where M and N are integers and unequal, has the steps of sending a message to determine a number of transmit paths to be used, awaiting an acknowledgement message comprising a number of receiver paths, setting the number of transmit paths based on at least the acknowledgement message, producing data streams from outbound data based on the number of transmit paths, applying the data streams to a space/time encoder to produce encoded signals and transmitting the encoded signals from at least a portion of N transmitting antennas.
摘要翻译：从N个发送天线向M个接收天线发送数据的方法，其中M和N是整数和不等的，具有发送消息以确定要使用的发送路径的数量的步骤，等待包括多个接收机的确认消息至少基于确认消息设置发送路径的数量，基于发送路径的数量从出站数据生成数据流，将数据流应用到空间/时间编码器以产生编码信号并从 N个发射天线的至少一部分。

8. 发明申请

US20070109955A1 Power control in MIMO transceiver 审中-公开
标题翻译： MIMO收发器中的功率控制
公开(公告)号：US20070109955A1
公开(公告)日：2007-05-17
申请号：US11542913
申请日：2006-10-04
申请人： Rajendra Moorti , Jason Trachewsky
发明人： Rajendra Moorti , Jason Trachewsky
IPC分类号： H04J11/00 , H04B7/216
CPC分类号： H04W52/42 , H03G3/3042 , H04W52/52
摘要： A method of controlling power levels on a plurality of transmit streams in a single radio transceiver includes, for each of the plurality of transmit streams, detecting an output power level and sampling the output power level, digitizing the sample output power level, producing the digitized sample to a baseband processor. The baseband processor is operable to perform rate based compensation on the digital sample, to integrate and dump a plurality of digitized samples over a period that exceeds a transmission frame period to produce an average value over a specified number of samples. Thereafter, the processor is operable to convert the integrated plurality of digitized samples to a normalized value and to comparing the normalized value to a target value to generate a power index value to determine an output power level with rate based compensation.
摘要翻译：控制单个无线电收发机中的多个发射流上的功率电平的方法包括：对于多个发射流中的每一个，检测输出功率电平并对输出功率电平进行采样，数字化采样输出功率电平，产生数字化采样到基带处理器。基带处理器可操作以对数字样本执行基于速率的补偿，以在超过传输帧周期的时间段内整合和转储多个数字化样本，以产生超过指定数量样本的平均值。此后，处理器可操作以将集成的多个数字化采样转换为归一化值，并将归一化值与目标值进行比较，以产生功率指数值，以通过基于速率的补偿来确定输出功率电平。

9. 发明申请

US20070002878A1 Multiple protocol wireless communication baseband transceiver 失效
标题翻译：多协议无线通信基带收发器
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。

10. 发明申请

US20070019749A1 Carrier detection applicable for SISO, MIMO, MISO, and SIMO communications 有权
标题翻译：载波检测适用于SISO，MIMO，MISO和SIMO通信
公开(公告)号：US20070019749A1
公开(公告)日：2007-01-25
申请号：US11402571
申请日：2006-04-12
申请人： Rohit Gaikwad , Rajendra Moorti , Jason Trachewsky
发明人： Rohit Gaikwad , Rajendra Moorti , Jason Trachewsky
IPC分类号： H04L27/28 , H04L27/06
CPC分类号： H04L27/2657
摘要： Carrier detection applicable for SISO, MIMO, MISO, and SIMO communications. A novel approach is presented to perform carrier detection for a signal found in any of a wide variety of communication systems including single-input-multiple-output (SISO), multiple-input-multiple-output (MIMO), multiple-input-single-output (MISO) single-input-multiple-output (SIMO), communication systems. This novel approach to performing carrier detection is more robust than those approaches existent in the art. By employing normalization with respect to power in determined a modified correlation function, there is less susceptibility to false detects. Also, this approach is quite robust to any circuitry DC offsets that may undesirably exist within a communication device that undergoes operational changes due to a variety of factors including environmental perturbations and/or changes in processing circuitry within the communication device (e.g., changes in gain control).
摘要翻译：载波检测适用于SISO，MIMO，MISO和SIMO通信。提出了一种新颖的方法来对在各种各样的通信系统中发现的信号执行载波检测，包括单输入多输出（SISO），多输入多输出（MIMO），多输入单 - 输出（MISO）单输入多输出（SIMO），通信系统。执行载波检测的这种新颖的方法比本领域中存在的那些方法更加鲁棒。通过在确定修正的相关函数中使用关于功率的归一化，对错误检测的敏感性较小。此外，该方法对于由于各种因素（包括环境扰动和/或通信设备内的处理电路的变化）而经历操作改变的通信设备中可能不期望地存在的任何电路DC偏移是相当鲁棒的控制）。

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