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公开(公告)号：EP1438791A1
公开(公告)日：2004-07-21
申请号：EP02773860.8
申请日：2002-10-22
CPC分类号： H04B1/707 , H04B2201/70701 , H04L2027/0069 , H04L2027/0081
摘要： The velocity of a wireless communications device (106) is estimated. In response to this estimate, a filter bandwidth, such as a pilot filter (310) bandwidth, is adjusted so that the introduction of noise and distortion to a signal received by the device is mitigated. The filter bandwidth is adjusted by increasing it as the estimated velocity increases; and decreasing it as the estimated velocity decreases. Such adjustments may be accomplished through providing a number of predetermined bandwidths that each correspond to a particular velocity range, and setting the filter bandwidth to the predetermined bandwidth that corresponds to the estimated velocity.
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公开(公告)号：EP1190522A1
公开(公告)日：2002-03-27
申请号：EP00939822.3
申请日：2000-06-12
发明人： PATEL, Shimman , WILBORN, Thomas
CPC分类号： H04J1/05 , H03G3/3052 , H04L5/06
摘要： The circuit has an input signal which is filtered with a first filter having a bandwidth greater than a bandwidth of the desired signal. The filtered signal is then sampled to generate discrete time samples, which is then filtered with a discrete time matched filter. The filtered samples are then scaled with a scaling factor and quantized. A quantity related to an amplitude of the quantized samples is measured, and the scaling factor is adjusted in accordance with the measured quantity. The quantized samples can be further processed and provided to a decoder. The desired signal can be a quadrature modulated signal. The adjustment of the scaling factor can be performed by an automatic gain control (AGC) loop that compares the measured signal power of the quantized samples against a predetermined value to generate error values. The AGC loop then filters the error values to generate the scaling factor.
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公开(公告)号：EP3295734B1
公开(公告)日：2020-03-04
申请号：EP16714677.8
申请日：2016-03-18
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公开(公告)号：EP3417559A1
公开(公告)日：2018-12-26
申请号：EP17701629.2
申请日：2017-01-09
发明人： CHEN, Wanshi , GAAL, Peter , PATEL, Shimman , MONTOJO, Juan , XU, Hao , DAMNJANOVIC, Aleksandar
摘要： Aspects of the present disclosure generally relate to a conditional utilization of reference signals for managing communications of one or more user equipment (UE) in a wireless communications system. The described aspects include receiving a transmission having a first subframe slot and a second subframe slot, at least one of the first subframe slot and the second subframe slot have a single-slot transmission time interval (TTI). The described aspects further include detecting a first demodulation reference signal (DM-RS) in the first subframe slot and a second DM-RS in the second subframe slot. The described aspects further include determining whether to demodulate the at least one downlink channel in the first subframe slot using the first DM-RS in the first subframe slot or to demodulate both the first DM-RS in the first subframe slot and the second DM-RS in the second subframe slot based on whether at least one condition exists.
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公开(公告)号：EP3198771A1
公开(公告)日：2017-08-02
申请号：EP15775298.1
申请日：2015-09-17
发明人： PATEL, Shimman , CHEN, Wanshi , GAAL, Peter , DAMNJANOVIC, Aleksandar , XU, Hao , WEI, Yongbin , MALLADI, Durga Prasad
IPC分类号： H04L5/00
摘要： A data structure for managing user equipment communications in a wireless communication system is presented. In some examples, the data structure may include one or more resource element blocks into which a frequency bandwidth of a downlink channel is divided within a symbol that defines a transmission time interval in a downlink subframe. Furthermore, the data structure may include a control region and a data region within at least one resource element block of the one or more resource element blocks. Additionally, the data structure may include a downlink resource grant, located within the control region, for a user equipment served by the downlink channel. In an additional aspect, a network entity and method for generating the example data structure are provided.
摘要翻译： 呈现了用于管理无线通信系统中的用户设备通信的数据结构。 在一些示例中，数据结构可以包括一个或多个资源单元块，下行链路信道的频率带宽在定义下行链路子帧中的传输时间间隔的符号内划分为一个或多个资源单元块。 此外，数据结构可以包括在一个或多个资源元素块的至少一个资源元素块内的控制区域和数据区域。 另外，数据结构可以包括位于控制区域内的下行链路资源许可，用于由下行链路信道服务的用户设备。 在另外的方面中，提供了用于生成示例数据结构的网络实体和方法。
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16.发明授权
公开(公告)号：EP1163739B1
公开(公告)日：2011-03-30
申请号：EP99961920.8
申请日：1999-12-02
发明人： CHEN, Tao , HOLTZMAN, Jack, M. , RAZOUMOV, Leonid , PATEL, Shimman , SAINTS, Keith , TIEDEMANN, Edward, G., Jr.
IPC分类号： H04W52/40
CPC分类号： H04W52/362 , H04W52/12 , H04W52/40
摘要： Method and apparatus for adjusting the transmission power of base stations (4, 6) in simultaneous communication with a mobile station (8). The methods described provide for the transmission power of the base stations (4, 6) to be aligned. In the first exemplary embodiment, the transmitters (20, 32) are attached to a separate control unit (12) through communication links. The control unit (12) then derives the most likely command stream and send that to the base stations. In the second exemplary embodiment, the control unit periodically receives the final or average transmit level in a period and an aggregate quality measure for the feedback during a period from each of the transmitters. The control unit (12) determines the aligned power level and transmits a message indicative of the aligned power level to the transmitters. In the third exemplary embodiment, the transmitters (20, 32) send the control unit (12) a message indicative of the transmit power of transmissions to the receiver. The control unit (12) determines the aligned transmit power based on the current transmit power.
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公开(公告)号：EP1999922A2
公开(公告)日：2008-12-10
申请号：EP06850959.5
申请日：2006-12-14
IPC分类号： H04L27/26
CPC分类号： H04L27/2695 , H04L5/0048 , H04L25/022 , H04L25/0228 , H04L27/2613 , H04L27/2659 , H04L27/2662 , H04L27/3872 , H04L2027/0034 , H04L2027/0065
摘要： For frequency bin error estimation, multiple hypotheses are formed for different frequency bin errors, pilot offsets, or combinations of frequency bin error and pilot offset. For each hypothesis, received symbols are extracted from the proper subbands determined by the hypothesis. In one scheme, the extracted received symbols for each hypothesis are despread with a scrambling sequence to obtain despread symbols for that hypothesis. A metric is derived for each hypothesis based on the despread symbols, e.g., by deriving a channel impulse response estimate based on the despread symbols and then deriving the metric based on the channel impulse response estimate. In another scheme, the extracted received symbols for each hypothesis are correlated, and a metric is derived based on the correlation results. For both schemes, the frequency bin error and/or the pilot offset are determined based on the metrics for all hypotheses evaluated.
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18.发明公开
公开(公告)号：EP1949636A1
公开(公告)日：2008-07-30
申请号：EP06839907.0
申请日：2006-11-15
IPC分类号： H04L27/26
CPC分类号： H04L27/2665 , H04L27/2678 , H04L27/2688 , H04L27/2695
摘要： Techniques for performing time tracking at a receiver are described. A first arriving path (FAP) and a last arriving path (LAP) are detected based on a channel impulse response estimate for a communication channel. The detected FAP and LAP may be correct or swapped. To resolve ambiguity in the detected FAP and LAP, a first hypothesis corresponding to the FAP and LAP being correctly detected and a second hypothesis corresponding to the FAP and LAP being incorrectly detected are evaluated. For each hypothesis, hypothesized FAP and LAP are determined based on the detected FAP and LAP, a correlation window is determined based on the hypothesized FAP and LAP, and correlation is performed using the correlation window. The correct hypothesis is determined based on correlation results for the two hypotheses. The receiver timing is updated based on the hypothesized FAP and LAP for the correct hypothesis and used for demodulation.
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公开(公告)号：EP1488535A1
公开(公告)日：2004-12-22
申请号：EP02807274.2
申请日：2002-09-13
发明人： PATEL, Shimman , KAN, Andrew
IPC分类号： H04B1/707
CPC分类号： H04B1/707 , H04B1/7075 , H04B1/7085 , H04B1/7097 , H04B2201/70701
摘要： A method and apparatus to dynamically adjust parameters of a filter for a pilot signal. An incoming signal containing a pilot signal is filtered using non-identical filters, and the magnitudes of the filtered signals are compared to estimate a bandwidth of the pilot signal. Noise in the incoming signal may also be estimated, preferably from a portion of the incoming signal not expected to contain the pilot signal. Based on the comparison of the filtered signal magnitudes, which may be compensated to remove the noise contribution, the parameters of a filter applied to the incoming signal to isolate the pilot signal are varied. The parameters may vary the bandwidth of a pilot signal filter. The non-identical filters used in the pilot signal bandwidth estimation may be IIR or FIR filters having different passbands, or may be a correlation of the incoming signal with sinusoids of different frequencies.
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公开(公告)号：EP1483844A1
公开(公告)日：2004-12-08
申请号：EP03711517.7
申请日：2003-03-11
IPC分类号： H04B7/005
CPC分类号： H04W52/282 , H04W52/60
摘要： The velocity of a wireless communications device (WCD) (106) is estimated. In response to this estimate a power control command rate is determined. The WCD 106 transmits power control signals to a base station (102) according to the power control command rate. The power control command rate may be determined by mapping the estimated velocity to a velocity range, and selecting a rate that corresponds to the velocity range as the power control command rate. Velocity is estimated by measuring a level crossing rate of a multipath signal.
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