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    • 3. 发明授权
    • Adaptive channel quality estimation algorithm to support link adaptation
    • 自适应信道质量估计算法支持链路自适应
    • US07756483B2
    • 2010-07-13
    • US11714982
    • 2007-03-07
    • Li Fung ChangYongqian WangXiaoxin QiuNelson R. Sollenberger
    • Li Fung ChangYongqian WangXiaoxin QiuNelson R. Sollenberger
    • H04B17/00
    • H04L27/0012H04B17/327H04L1/0003H04L1/0009H04L1/0026H04L1/0045H04L1/0075H04L1/203H04L25/03261H04L25/03318
    • RF communications received by a wireless terminal from a servicing base station are used to determine the channel quality such as reported bit error probability (BEP). The RF communications may be in the form of RF bursts that are part of a data frame. An estimated BEP may be determined from the signal to noise ratio (SNR) of the RF bursts and or a sequence of soft decisions extracted from the RF bursts, and their historical performance. The SNR maps to an estimated BEP based upon the modulation format of the RF bursts. The soft decisions decode to produce a data block. When the soft decisions decoded favorably, the re-encoded data block produces a sequence of re-encoded decisions. Comparing the re-encoded decisions to the soft decisions yields a re-encoded bit error (RBER). The reported BEP may be based upon the estimated BEP, RBER, and/or RBER threshold. The RBER threshold may be adaptively incremented or decremented depending upon whether or not the RF communications were properly decoded. The size of the increment or decrement may be based on the channel quality.
    • 使用无线终端从服务基站接收的RF通信来确定诸如所报告的比特错误概率(BEP)的信道质量。 RF通信可以是作为数据帧的一部分的RF突发的形式。 可以根据RF突发的信噪比(SNR)和从RF突发提取的一系列软判决及其历史性能来确定估计的BEP。 SNR基于RF突发的调制格式映射到估计的BEP。 软判决解码以产生数据块。 当软判决被有利地解码时,重新编码的数据块产生一系列重新编码的决定。 将重新编码的决定与软判决进行比较产生重编码位错误(RBER)。 报告的BEP可以基于估计的BEP,RBER和/或RBER阈值。 RBER阈值可以根据RF通信是否被正确解码而自适应地递增或递减。 增量或减量的大小可以基于通道质量。
    • 5. 发明授权
    • Medium access control layer for packetized wireless systems
    • 用于分组化无线系统的媒体接入控制层
    • US06532225B1
    • 2003-03-11
    • US09361572
    • 1999-07-27
    • Li Fung ChangKapil K. ChawlaJustin C. ChuangXiaoxin QiuNelson R. Sollenberger
    • Li Fung ChangKapil K. ChawlaJustin C. ChuangXiaoxin QiuNelson R. Sollenberger
    • H04Q728
    • H04W76/10H04W8/26H04W24/10H04W48/08H04W52/0216H04W72/00H04W74/00H04W74/04H04W74/06Y02D70/1224
    • An arrangement where, in addition to the control channels that are used to set up sessions, there is a logically and physically separate and independent set of control channels that can be used as session control channels. Illustratively, the physical GSM frame arrangement that employs 8 logical slots is used, with one slot both in the uplink and downlink dedicated to these separate control channels. In the downlink, such a control channel provides channel grant information, requests to make and transmit power measurements, poll mobile units, etc. In the uplink, such a control channel can be used to request access to a traffic channel, to report on power measurements, to request special hand-off handling, to respond to polling, etc. Because the uplink session control channel does not need to carry a significant amount of information, the GSM slot can be divided into minislots, with each minislot constituting a session control channel for a group of mobile units.
    • 除了用于建立会话的控制信道之外,还有一个逻辑上和物理上分开且独立的控制信道集合,可用作会话控制信道。 示例性地,使用采用8个逻辑时隙的物理GSM帧布置,其中专用于这些单独控制信道的上行链路和下行链路中的一个时隙。 在下行链路中,这样的控制信道提供信道授权信息,发送功率测量的请求,轮询移动单元等。在上行链路中,可以使用这样的控制信道来请求访问业务信道,报告功率 测量,请求特殊切换处理,以响应轮询等。由于上行会话控制信道不需要携带大量的信息,所以GSM时隙可以分为小时隙,每个小时隙构成会话控制 一组移动单元的通道。
    • 6. 发明授权
    • Cluster path processor time alignment for signal suppression/separation in a wireless device
    • 用于无线设备中信号抑制/分离的群集路径处理器时间对齐
    • US07697596B2
    • 2010-04-13
    • US11731317
    • 2007-03-29
    • Junqiang LiNelson R. SollenbergerLi Fung ChangMark David HahmHongwei Kong
    • Junqiang LiNelson R. SollenbergerLi Fung ChangMark David HahmHongwei Kong
    • H04B1/00
    • H04L7/0054H04B1/7085H04B1/7117H04L7/007H04L7/033
    • A system for processing radio frequency (RF) signals includes a searcher and a plurality of Cluster Path Processor (CPPs). The searcher detects a maximum signal energy level and position of at least one of a plurality of individual distinct path signals in a signal cluster of a first information signal, wherein at least a portion of the plurality of individual distinct path signals is received within a duration of a corresponding delay spread. The sampling position is used as a starting sampling location by the plurality of CPPs, including a first information signal CPP and a second information signal CPP. Fine sampling positions of the plurality of CPPs are based upon channel energy estimates for the plurality of individual distinct path signals. CPP outputs are employed to produce channel estimates, which are themselves used in subsequent equalization operations. Sampling positions may change over time in order to satisfy alignment criteria.
    • 用于处理射频(RF)信号的系统包括搜索器和多个群集路径处理器(CPP)。 搜索器在第一信息信号的信号簇中检测最大信号能级和多个独立不同路径信号中的至少一个的位置,其中多个独立不同路径信号的至少一部分在持续时间内被接收 的相应的延迟传播。 采样位置由多个CPP用作起始采样位置,包括第一信息信号CPP和第二信息信号CPP。 多个CPP的精细采样位置是基于多个独立不同路径信号的信道能量估计。 CPP输出用于产生信道估计,它们本身用于随后的均衡操作。 采样位置可能随时间而变化,以满足对准标准。
    • 8. 发明授权
    • WCDMA terminal baseband processing module having cell searcher module
    • WCDMA终端基带处理模块具有小区搜索器模块
    • US07894508B2
    • 2011-02-22
    • US11221145
    • 2005-09-06
    • Mark David HahmLi Fung ChangNelson R. Sollenberger
    • Mark David HahmLi Fung ChangNelson R. Sollenberger
    • H04B1/00
    • H04B1/70735H04B1/7083H04B2201/70707
    • A baseband processing module includes TX processing components, a processor, memory, an RX interface, and a cell searcher module. The TX processing components receive outbound data, process the outbound data to produce a baseband TX signal, and output the baseband TX signal to a RF front end of the RF transceiver. The RX interface receives a baseband RX signal from the RF front end carrying a WCDMA signal. The cell searcher module receives the baseband RX signal, scans for WCDMA energy within the baseband RX signal, acquires slot synchronization to the WCDMA signal based upon correlation with a Primary Synchronization Channel (PSCH) of the WCDMA signal, acquires frame synchronization to, and identify a code group of, the WCDMA signal based upon correlation with a Secondary Synchronization Channel (SSCH) of the WCDMA signal, and identifies the scrambling code of the WCDMA signal based upon correlation with a Common Pilot Channel (CPICH) of the WCDMA signal.
    • 基带处理模块包括TX处理组件,处理器,存储器,RX接口和小区搜索器模块。 TX处理组件接收出站数据,处理出站数据以产生基带TX信号,并将基带TX信号输出到RF收发器的RF前端。 RX接口从承载WCDMA信号的RF前端接收基带RX信号。 小区搜索器模块接收基带RX信号,扫描基带RX信号内的WCDMA能量,基于与WCDMA信号的主同步信道(PSCH)的相关性,获取WCDMA信号的时隙同步,获取帧同步和识别 基于与WCDMA信号的次同步信道(SSCH)的相关性的WCDMA信号的码组,并且基于与WCDMA信号的公共导频信道(CPICH)的相关性来识别WCDMA信号的扰码。
    • 9. 发明授权
    • Frequency domain equalizer for dual antenna radio
    • 双天线收音机的频域均衡器
    • US07907662B2
    • 2011-03-15
    • US12703311
    • 2010-02-10
    • Junqiang LiMark David HahmNelson R. SollenbergerLi Fung Chang
    • Junqiang LiMark David HahmNelson R. SollenbergerLi Fung Chang
    • H03H7/30
    • H04L25/03038H04L25/0204H04L25/0212H04L25/022H04L2025/03426H04L2025/03605
    • A Radio Frequency (RF) receiver includes a RF front end and a baseband processing module coupled to the RF front end that is operable to receive a time domain signal that includes time domain training symbols and time domain data symbols. The baseband processing module includes a channel estimator operable to process the time domain training symbols to produce a time domain channel estimate, a Fast Fourier Transformer operable to convert the time domain channel estimate to the frequency domain to produce a frequency domain channel estimate, a weight calculator operable to produce frequency domain equalizer coefficients based upon the frequency domain channel estimate, an Inverse Fast Fourier Transformer operable to converting the frequency domain equalizer coefficients to the time domain to produce time domain equalizer coefficients, and an equalizer operable to equalize the time domain data symbols using the time domain equalizer coefficients.
    • 射频(RF)接收机包括RF前端和耦合到RF前端的基带处理模块,其可操作以接收包括时域训练符号和时域数据符号的时域信号。 基带处理模块包括信道估计器,其可操作以处理时域训练符号以产生时域信道估计;快速傅立叶变换器,其可操作以将时域信道估计转换为频域以产生频域信道估计,权重 计算器,其可操作以基于频域信道估计产生频域均衡器系数;反傅里叶变换器,其可操作以将频域均衡器系数转换到时域以产生时域均衡器系数;以及均衡器,其可操作以均衡时域数据 符号使用时域均衡器系数。
    • 10. 发明授权
    • Frequency domain equalizer for dual antenna radio
    • 双天线收音机的频域均衡器
    • US07684526B2
    • 2010-03-23
    • US11524584
    • 2006-09-21
    • Junqiang LiMark David HahmNelson R. SollenbergerLi Fung Chang
    • Junqiang LiMark David HahmNelson R. SollenbergerLi Fung Chang
    • H04B7/10
    • H04L25/03038H04L25/0204H04L25/0212H04L25/022H04L2025/03426H04L2025/03605
    • A Radio Frequency (RF) receiver includes a RF front end and a baseband processing module coupled to the RF front end that is operable to receive a time domain signal that includes time domain training symbols and time domain data symbols. The baseband processing module includes a channel estimator operable to process the time domain training symbols to produce a time domain channel estimate, a Fast Fourier Transformer operable to convert the time domain channel estimate to the frequency domain to produce a frequency domain channel estimate, a weight calculator operable to produce frequency domain equalizer coefficients based upon the frequency domain channel estimate, an Inverse Fast Fourier Transformer operable to converting the frequency domain equalizer coefficients to the time domain to produce time domain equalizer coefficients, and an equalizer operable to equalize the time domain data symbols using the time domain equalizer coefficients.
    • 射频(RF)接收机包括RF前端和耦合到RF前端的基带处理模块,其可操作以接收包括时域训练符号和时域数据符号的时域信号。 基带处理模块包括信道估计器,其可操作以处理时域训练符号以产生时域信道估计;快速傅立叶变换器,其可操作以将时域信道估计转换为频域以产生频域信道估计,权重 计算器,其可操作以基于频域信道估计产生频域均衡器系数;反傅里叶变换器,其可操作以将频域均衡器系数转换到时域以产生时域均衡器系数;以及均衡器,其可操作以均衡时域数据 符号使用时域均衡器系数。