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公开(公告)号：US07779338B2
公开(公告)日：2010-08-17
申请号：US11490844
申请日：2006-07-21
申请人： Mustafa Altintas , Turgut Aytur , Ravishankar H. Mahadevappa , Feng Shi , Stephan ten Brink , Ran Yan
发明人： Mustafa Altintas , Turgut Aytur , Ravishankar H. Mahadevappa , Feng Shi , Stephan ten Brink , Ran Yan
IPC分类号： H03M13/03
CPC分类号： H03M13/41 , H03M13/27 , H03M13/6561 , H03M13/6566 , H04L1/0054 , H04L1/0059 , H04L1/0068 , H04L1/0071 , H04L1/06
摘要： Pairs of parallel Viterbi decoders use windowed block data for decoding data at rates above 320 Mbps. Memory banks of the deinterleavers feeding the decoders operate such that some are receiving data while others are sending data to the decoders. Parallel input streams to every pair of decoders overlap for several traceback lengths of the decoder causing data input to a first decoder at the end of an input stream to be the same as the data input to a second decoder of the same pair at the beginning of an input stream. Then, the first decoder is able to post-synchronize its path metric with the second decoder and the second decoder is able to pre-synchronize its path metric with the first. Either, the deinterleaver data length is an integer multiple of the traceback length or the data input to only the first block of the first interleaver is padded.
摘要翻译： 一对并行维特比解码器使用窗口块数据，以高于320 Mbps的速率解码数据。 供给解码器的解交织器的存储器操作，使得一些接收数据，而其他数据传送到解码器。 对于每对解码器的并行输入流与解码器的几个回溯长度重叠，导致在输入流结束时输入到第一解码器的数据输入与输入到相同对的第二解码器的数据相同 一个输入流。 然后，第一解码器能够与第二解码器后同步其路径度量，并且第二解码器能够将其路径度量与第一解码器预先同步。 或者，解交织器数据长度是回溯长度的整数倍，或仅填充第一交织器的第一块的数据输入。
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公开(公告)号：US07738575B2
公开(公告)日：2010-06-15
申请号：US11490850
申请日：2006-07-21
IPC分类号： H04K1/10
CPC分类号： H04L25/061 , H04B1/715 , H04L25/06 , H04L27/2601 , H04L27/2605 , H04L27/2607 , H04L27/2647
摘要： A method and system for estimating DC offset and removing the excess DC offset from samples used by an overlap-and-add operation at the receiver of OFDM symbols in UWB communication. The DC offset for each sample within the overlap-and-add interval may be estimated using a sliding window, of the size required for an FFT, operation over past samples. The DC offset may be estimated for a sample within the overlap-and-add interval and updated for the succeeding samples. A size of the overlap-and-add interval may be fixed or may be allowed to vary according to switching characteristics of an analog RF stage preceding the overlap-and-add operation.
摘要翻译： 一种用于估计DC偏移并从UWB通信中的OFDM符号的接收机处的重叠和加法运算使用的样本中去除多余的DC偏移的方法和系统。 可以使用具有FFT过程所需大小的滑动窗口来估计重叠和添加间隔内的每个采样的DC偏移，对以前的采样进行操作。 可以针对重叠和添加间隔内的样本估计DC偏移量，并为后续样本进行更新。 重叠和添加间隔的大小可以是固定的，或者可以根据重叠和添加操作之前的模拟RF级的切换特性而变化。
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公开(公告)号：US08457162B2
公开(公告)日：2013-06-04
申请号：US11506193
申请日：2006-08-16
IPC分类号： H04J3/06
CPC分类号： H04L7/042 , H04B1/7183 , H04L27/2656 , H04L27/2675 , H04L27/2676 , H04W24/00
摘要： An apparatus for and a method of performing packet detection in a receiver is provided. The apparatus is configured to determine a measure of a correlation between information of one or more received symbols and synchronization information. The apparatus is also configured to determine a measure of an energy value of one or more of the received symbols. The apparatus is also configured to determine if a packet has been detected based on the measure of the correlation and the measure of the energy value of the one or more received symbols.
摘要翻译： 提供了一种用于在接收机中执行分组检测的装置和方法。 该装置被配置为确定一个或多个接收到的符号的信息与同步信息之间的相关性的度量。 该装置还被配置为确定一个或多个接收符号的能量值的度量。 该装置还被配置为基于相关性的测量和一个或多个接收符号的能量值的测量来确定是否已经检测到分组。
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公开(公告)号：US08254480B2
公开(公告)日：2012-08-28
申请号：US13044157
申请日：2011-03-09
CPC分类号： H04L27/2601 , H03G3/3068 , H04B1/71637 , H04L27/2647
摘要： An automatic gain control method and system for use in signal processing of OFDM symbols at a receiver. Two stages of coarse and fine automatic gain control are implemented that adjust different gains in an analog RF processing stage of the receiver. Gain of a low noise amplifier and a mixer are adjusted during a first and coarse automatic gain control stage based on feedback from a digital baseband stage. During a subsequent fine gain control period, the gain of a programmable gain amplifier is adjusted separately for each frequency band used by the OFDM symbols based on a histogram bin that counts the number of output samples of an analog to digital converter whose magnitude falls within certain ranges. Coarse and fine gains are updated after each OFDM symbol.
摘要翻译： 一种用于在接收机处对OFDM符号进行信号处理的自动增益控制方法和系统。 实现两级粗略和精细的自动增益控制，可在接收机的模拟RF处理阶段调整不同的增益。 基于来自数字基带级的反馈，在第一和粗略的自动增益控制级中调整低噪声放大器和混频器的增益。 在随后的精细增益控制周期期间，可编程增益放大器的增益分别针对由OFDM符号使用的每个频带进行调整，所述频带基于对其幅度在一定范围内的模数转换器的输出样本数进行计数的直方图单元 范围。 在每个OFDM符号之后更新粗和细增益。
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公开(公告)号：US07916799B2
公开(公告)日：2011-03-29
申请号：US11696113
申请日：2007-04-03
IPC分类号： H04L27/28
CPC分类号： H04B1/7183
摘要： A method and a receiver system for subcarrier-specific frequency offset correction including frequency offset estimation, updating and compensation. The method includes initial frequency offset estimation in time domain using packet preamble, frequency offset compensation during channel estimation symbols using the initial frequency offset estimate, and frequency offset update tracking during header and data part both being performed in the frequency domain. The initial frequency offset estimation includes using a sum over a number of time lagged autocorrelation results, corresponding to a number of the last consecutive symbols of the preamble part of the packet with the autocorrelations being the result of a sum over a window of cross-correlations between the incoming signal and the respective packet synchronization sequence. The receiver includes receiver blocks for initial frequency offset estimation, frequency offset compensation, frequency offset update tracking and obtaining a current frequency offset estimate.
摘要翻译： 一种用于子载波特定频偏校正的方法和接收机系统，包括频偏估计，更新和补偿。 该方法包括使用分组前导码的时域中的初始频率偏移估计，使用初始频率偏移估计的信道估计符号期间的频率偏移补偿以及在频域中执行的报头和数据部分期间的频率偏移更新跟踪。 初始频率偏移估计包括使用与多个时间滞后自相关结果相对应的和，其对应于分组的前导码部分的最后连续符号的数量，其中自相关是互相关窗口上的和的结果 在输入信号和相应的分组同步序列之间。 接收机包括用于初始频率偏移估计的接收器块，频率偏移补偿，频率偏移更新跟踪和获得当前频率偏移估计。
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公开(公告)号：US20070280366A1
公开(公告)日：2007-12-06
申请号：US11757247
申请日：2007-06-01
IPC分类号： H04K1/10
CPC分类号： H04L25/0228 , H04L25/022 , H04L27/2647
摘要： A receiver including a channel estimation function in which an initial channel estimate is filtered to increase receiver operation, particularly when the receiver may only have a limited number of channel estimation symbols with which to form the channel estimate. In some embodiments the filtering is performed by transforming the initial channel estimate to the time domain, zeroing some of the samples to filter the time domain channel estimate, and transforming the filtered time domain channel estimate to the frequency domain for use in channel compensation.
摘要翻译： 一种包括信道估计功能的接收机，其中对初始信道估计进行滤波以增加接收机操作，特别是当接收机只能具有用于形成信道估计的有限数量的信道估计符号时。 在一些实施例中，通过将初始信道估计变换到时域来执行滤波，对某些采样进行归零以对时域信道估计进行滤波，并将经滤波的时域信道估计变换到频域以用于信道补偿。
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公开(公告)号：US20120140794A1
公开(公告)日：2012-06-07
申请号：US13372577
申请日：2012-02-14
IPC分类号： H04B1/713
CPC分类号： H04L27/2601 , H03G3/3068 , H04B1/71637 , H04L27/2647
摘要： An automatic gain control method and system for use in signal processing of OFDM symbols at a receiver. Two stages of coarse and fine automatic gain control are implemented that adjust different gains in an analog RF processing stage of the receiver. Gain of a low noise amplifier and a mixer are adjusted during a first and coarse automatic gain control stage based on feedback from a digital baseband stage. During a subsequent fine gain control period, the gain of a programmable gain amplifier is adjusted separately for each frequency band used by the OFDM symbols based on a histogram bin that counts the number of output samples of an analog to digital converter whose magnitude falls within certain ranges. Coarse and fine gains are updated after each OFDM symbol.
摘要翻译： 一种用于在接收机处对OFDM符号进行信号处理的自动增益控制方法和系统。 实现两级粗略和精细的自动增益控制，可在接收机的模拟RF处理阶段调整不同的增益。 基于来自数字基带级的反馈，在第一和粗略的自动增益控制级中调整低噪声放大器和混频器的增益。 在随后的精细增益控制周期期间，可编程增益放大器的增益分别针对由OFDM符号使用的每个频带进行调整，所述频带基于对其幅度在一定范围内的模数转换器的输出样本数进行计数的直方图单元 范围。 在每个OFDM符号之后更新粗和细增益。
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8.发明授权System and method using high performance preamble cover sequences for multi-band OFDM two-band hopping modes 有权用于多频带OFDM双频段跳频模式的高性能前同步码覆盖序列的系统和方法公开(公告)号：US08014435B2
公开(公告)日：2011-09-06
申请号：US12110203
申请日：2008-04-25
IPC分类号： H04B1/00
CPC分类号： H04L27/2613 , H04L27/2656
摘要： Methods and systems for packet preamble sequences are provided. The preamble sequences are produce by multiplying preestablished base sequences by cover sequences. The cover sequences are chosen for high-performance in multi-band OFDM systems with modes that include two-band hopping.
摘要翻译： 提供了用于分组前同步码序列的方法和系统。 前序序列是通过覆盖序列乘以预先确定的碱基序列产生的。 在具有包括双波段跳变的模式的多频带OFDM系统中选择覆盖序列用于高性能。
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公开(公告)号：US07986739B2
公开(公告)日：2011-07-26
申请号：US12036968
申请日：2008-02-25
IPC分类号： H04L27/28
CPC分类号： H04L5/0062 , H04L5/0007 , H04L27/0006
摘要： A method and system for detecting the presence of narrowband transmitters utilizing frequencies also utilized by wider band communication systems. In some embodiments an ultrawideband transceiver detects signals at specific frequencies within a spectrum of frequencies, and analyzes the signals to determine if the signals indicate transmissions by a narrowband transmitter in a narrowband communication system. In further embodiments transmission circuitry reduces signal components at frequencies occupied by the narrowband transmitters.
摘要翻译： 一种用于利用更宽频带通信系统也利用的频率来检测窄带发射机的存在的方法和系统。 在一些实施例中，超宽带收发器在频谱范围内检测特定频率的信号，并分析信号以确定信号是否指示窄带通信系统中窄带发射机的传输。 在另外的实施例中，传输电路在由窄带发射机占据的频率处减少信号分量。
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公开(公告)号：US07916798B2
公开(公告)日：2011-03-29
申请号：US11506754
申请日：2006-08-18
CPC分类号： H04L27/2601 , H03G3/3068 , H04B1/71637 , H04L27/2647
摘要： An automatic gain control method and system for use in signal processing of OFDM symbols at a receiver. Two stages of coarse and fine automatic gain control are implemented that adjust different gains in an analog RF processing stage of the receiver. Gain of a low noise amplifier and a mixer are adjusted during a first and coarse automatic gain control stage based on feedback from a digital baseband stage. During a subsequent fine gain control period, the gain of a programmable gain amplifier is adjusted separately for each frequency band used by the OFDM symbols based on a histogram bin that counts the number of output samples of an analog to digital converter whose magnitude falls within certain ranges. Coarse and fine gains are updated after each OFDM symbol.
摘要翻译： 一种用于在接收机处对OFDM符号进行信号处理的自动增益控制方法和系统。 实现两级粗略和精细的自动增益控制，可在接收机的模拟RF处理阶段调整不同的增益。 基于来自数字基带级的反馈，在第一和粗略的自动增益控制级中调整低噪声放大器和混频器的增益。 在随后的精细增益控制周期期间，可编程增益放大器的增益针对OFDM符号使用的每个频带单独调整，该直方图单元基于对模数转换器的输出样本的数量进行计数，该模数转换器的幅度在一定范围内 范围。 在每个OFDM符号之后更新粗和细增益。
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