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1.
公开(公告)号:US11057109B2
公开(公告)日:2021-07-06
申请号:US16360980
申请日:2019-03-21
IPC分类号: H04B10/2575 , H04W52/24 , H04W52/28 , H04B10/564 , H04W52/02 , H04W4/029
摘要: A method for operating a Distributed Antenna System (DAS) includes providing a plurality of Digital Remote Units (DRUs), each configured to send and receive wireless radio signals and providing a plurality of inter-connected Digital Access Units (DAUs), each configured to communicate with at least one of the plurality of DRUs via optical signals and each being coupled to at least one sector of a base station. The method also includes providing a plurality of sensors operable to detect activity at each of the plurality of DRUs, turning off a DRU downlink signal at one of the plurality of DRUs in response to an output from one of the plurality of sensors, and turning on a DRU downlink signal at another of the plurality of DRUs in response to an output from another of the plurality of sensors.
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公开(公告)号:US10931377B2
公开(公告)日:2021-02-23
申请号:US16738156
申请日:2020-01-09
摘要: A system for data transport in a Distributed Antenna System (DAS) includes a plurality of remote Digital Access Units (DAUs) located at a Remote location. The plurality of remote DAUs are coupled to each other and operable to transport digital signals between the plurality of remote DAUs. The system also includes a plurality of central hubs. Each of the plurality of central hubs is in communication with one of the remote DAUs using an electrical communications path. The system further includes a plurality of transmit/receive cells. Each of the plurality of transmit/receive cells includes a plurality of remote hubs. Each of the remote hubs in one of the plurality of transmit/receive cells is in communication with one of the plurality of central hubs using an optical communications path.
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公开(公告)号:US10416312B2
公开(公告)日:2019-09-17
申请号:US15279136
申请日:2016-09-28
摘要: A system for indoor localization using satellite navigation signals in a Distributed Antenna System includes a plurality of Off-Air Access Units (OAAUs). Each of the plurality of OAAUs is operable to receive an individual satellite navigation signal from at least one of a plurality of satellites and operable to route signals optically to one or more DAUs. The system also includes a plurality of remote DRUs located at a remote location. The plurality of remote DRUs are operable to receive signals from a plurality of local DAUs. The system further includes an algorithm to delay each individual satellite navigation signal for providing indoor localization at each of the plurality of DRUs and a GPS receiver at the remote location used in a feedback loop with the DRU to control the delays.
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公开(公告)号:US10256853B2
公开(公告)日:2019-04-09
申请号:US14918371
申请日:2015-10-20
摘要: A method of operating a communications system includes receiving a signal at a digital predistorter (DPD), introducing predistortion to the signal using the DPD, and converting the predistorted signal to an analog signal using a digital-to-analog converter having a first bandwidth. The method also includes amplifying the analog signal, sampling the amplified signal using an analog-to-digital converter having a second bandwidth less than the first bandwidth, and extracting coefficients of the DPD from the sampled signal.
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公开(公告)号:US10180497B2
公开(公告)日:2019-01-15
申请号:US15582776
申请日:2017-05-01
摘要: A system for indoor localization using satellite navigation signals in a Distributed Antenna System includes a plurality of Off-Air Access Units (OAAUs). Each of the plurality of OAAUs is operable to receive an individual satellite navigation signal from at least one of a plurality of satellites and operable to route signals optically to one or more DAUs. The system also includes a plurality of remote DRUs located at a Remote location. The plurality of remote DRUs are operable to receive signals from a plurality of the one or more DAUs. The system further includes an algorithm to delay each individual satellite navigation signal for providing indoor localization at each of the plurality of DRUs.
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公开(公告)号:US20180249532A1
公开(公告)日:2018-08-30
申请号:US15857356
申请日:2017-12-28
CPC分类号: H04W84/042 , H04W4/70 , H04W4/90 , H04W84/047 , H04W88/08 , H04W88/085
摘要: A mesh network includes one or more digital access units (DAUs) operable to receive signals from a base transceiver station (BTS). The mesh network also includes a first digital remote unit (DRU) coupled to at least one of the one or more DAUs and a second digital remote unit (DRU) coupled to at least one of the one or more DAUs. The first DRU and the second DRU are coupled to each other through a wireless link.
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7.
公开(公告)号:US20180239025A1
公开(公告)日:2018-08-23
申请号:US15819279
申请日:2017-11-21
摘要: A real-time locating system (RTLS) for localization using satellite navigation signals in a Distributed Antenna System includes Off-Air Access Units (OAAUs), each being operable to receive an individual satellite navigation signal from a satellite and to route signals optically to a digital access unit (DAU). Remote digital remote units (DRUs) are located at Remote locations and are operable to receive signals the DAUs. Each individual satellite navigation signal can be appropriately delayed (in a manner that accounts for a DRU's location). For each antenna, a separation distance between a mobile station and a DRU can be estimated based on a signal receipt time at the station. In combination, these distances can be used to estimate the mobile station's precise indoor position.
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公开(公告)号:US20180227870A1
公开(公告)日:2018-08-09
申请号:US15820299
申请日:2017-11-21
IPC分类号: H04W56/00 , H04L25/03 , H04B17/318 , H04B7/04 , H04L5/14
CPC分类号: H04W56/0095 , H04B7/04 , H04B17/318 , H04L5/0048 , H04L5/0053 , H04L5/14 , H04L5/1469 , H04L25/03 , H04L27/2656 , H04L27/2675 , H04W56/00 , H04W56/001 , H04W88/085
摘要: A method of detecting a synchronization switching pulse using a power detector in a time division duplexing (TDD) system includes receiving an input signal, detecting a power level associated with the input signal using a digital power meter, and determining a configuration associated with the input signal. The method also includes determining that a pulse width associated with the input signal is greater than a threshold, determining an offset associated with a special subframe configuration, and generating an estimated sync pulse. The method further includes forming a regenerated sync pulse, determining an error between the estimated sync pulse and the regenerated sync pulse, determining that the error is less than a threshold, and providing a lock detect.
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公开(公告)号:US09954585B2
公开(公告)日:2018-04-24
申请号:US14831626
申请日:2015-08-20
CPC分类号: H04B7/04 , H04B7/022 , H04B10/25753 , H04W88/085
摘要: A distributed antenna system includes a master unit including a downlink RF input operable to receive an RF input signal from a downlink port of a base station, a first optical port, and a second optical port. The distributed antenna system also includes a first remote unit coupled to the first optical port. The first remote unit comprises a downlink antenna port and a first uplink antenna port and a second remote unit coupled to the second optical port of the master unit. The second remote unit comprises a downlink antenna port and a second uplink antenna port. The master unit is operable to transmit a first RF signal associated with the first RF uplink signal to a first uplink port of the base station and transmit a second RF signal associated with the second RF uplink signal to a second uplink port of the base station.
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公开(公告)号:US20180102747A1
公开(公告)日:2018-04-12
申请号:US15684580
申请日:2017-08-23
CPC分类号: H03F1/3247 , H03F1/3258 , H03F3/19 , H03F3/20 , H03F3/24 , H03F2200/129 , H03F2200/451 , H03F2201/3224 , H03F2201/3227 , H03F2201/3233
摘要: A RF-digital hybrid mode power amplifier system for achieving high efficiency and high linearity in wideband communication systems is disclosed. The present invention is based on the method of adaptive digital predistortion to linearize a power amplifier in the RF domain. The power amplifier characteristics such as variation of linearity and asymmetric distortion of the amplifier output signal are monitored by the narrowband feedback path and controlled by the adaptation algorithm in a digital module. Therefore, the present invention could compensate the nonlinearities as well as memory effects of the power amplifier systems and also improve performances, in terms of power added efficiency, adjacent channel leakage ratio and peak-to-average power ratio. The present disclosure enables a power amplifier system to be field reconfigurable and support multi-modulation schemes (modulation agnostic), multi-carriers and multi-channels. As a result, the digital hybrid mode power amplifier system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems, where baseband I-Q signal information is not readily available.
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