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公开(公告)号：US11831363B2
公开(公告)日：2023-11-28
申请号：US16150219
申请日：2018-10-02
Applicant: SPATIAL DIGITAL SYSTEMS, INC.
Inventor： Donald C. D. Chang , Juo-Yu Lee
IPC: H04B7/0413 , H04B7/06 , H04B17/30 , H04B17/391 , H04B17/10
CPC classification number: H04B7/0413 , H04B7/0626 , H04B17/30 , H04B17/391 , H04B17/102
Abstract: A communications system includes at least one receiver having receiving elements and a transmitter having transmitting elements to transmit signals to the receiving elements via wireless propagation channels. The transmitter includes a beam-forming network and a channel measurement unit. The beam-forming network receives input signal streams at its input ports and outputs one or more signals as shaped beams based on a set of composited transfer functions. The channel measurement unit performs measurements of components of channel status information to generate a set of point-to-point transfer functions and generates the composited transfer functions by computing linear combinations of the point-to-point transfer functions. Each of the point-to-point transfer functions characterizes propagation paths from one of the transmitting elements to one of the receiving elements. The composited transfer functions are point-to-multipoint transfer functions characterizing propagation paths from the input ports of the beam-forming network to one or more of the receiving elements.
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公开(公告)号：US20220337312A1
公开(公告)日：2022-10-20
申请号：US17855790
申请日：2022-06-30
Applicant: SPATIAL DIGITAL SYSTEMS, INC.
Inventor： Donald C. D. Chang , Steve K. Chen
Abstract: A source terminal, for communications with a destination terminal via satellite links to two clusters of satellites, comprises a transmitter and a multibeam antenna system. The transmitter includes a preprocessor and a bank of modulators. The preprocessor performs a K-muxing transform, which has an inverse transform, on M concurrent input data streams to generate concurrently M output data streams, M>1. Each output data stream is a linear combination of the M concurrent input data streams. The bank of modulators transforms N of the M output data streams into N signal streams, N≤M. The multibeam antenna system transforms the N signal streams into N shaped beams and radiating N1 of the N shaped beams towards the first cluster of satellites and N2 of the N shaped beams towards the second cluster of satellites, where N1 and N2 are positive integers and N1+N2=N.
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公开(公告)号：US10171160B2
公开(公告)日：2019-01-01
申请号：US15420114
申请日：2017-01-31
Applicant: SPATIAL DIGITAL SYSTEMS, INC.
Inventor： Donald C. D. Chang
IPC: H04B7/185 , H01Q9/04 , H01Q21/24 , H04J14/06 , H01Q3/24 , H04B7/06 , H04L5/00 , H04L5/02 , H04W24/02 , H04W72/04
Abstract: A satellite communications system for communicating at a first frequency slot with first and second pairs of satellite transponders in linear polarization format. The system comprises a first terminal, a second terminal and a station. The first terminal receives at least one first input signal and concurrently radiates a first output signal at the first frequency slot to the first and second pairs of satellite transponders via a first beam and a second beam, respectively, in right-hand circularly polarized format. The second terminal receives at least one second input signal and concurrently radiates a second output signal at the first frequency slot to the first and second pairs of satellite transponders via a third beam and a fourth beam, respectively, in left-hand circularly polarized format. The station receives four satellite signals from the first and second pairs of transponders and recovers the at least one first input signal and the at least one second input signal using wavefront multiplexing technique.
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公开(公告)号：US10142855B2
公开(公告)日：2018-11-27
申请号：US15591101
申请日：2017-05-09
Applicant: SPATIAL DIGITAL SYSTEMS, INC.
Inventor： Donald C. D. Chang
IPC: H04W16/28 , H04W72/04 , H01Q3/26 , H01Q3/28 , H01Q1/00 , H01Q1/22 , H01Q3/24 , H01Q25/00 , H01Q3/36 , H01Q3/40 , H04J13/00
Abstract: A user terminal for transmitting data to a plurality of access points comprises a pre-processor to pre-process at least one source data stream and a multi-beam antenna. The pre-processor comprises a segmenting device to segment the at least one source data stream into a set of N data sub streams, N being an integer greater than 1; a K-muxing unit to perform a N-to-N K-muxing transform on the N data substreams to generate N K-muxed data streams, each of the N K-muxed data streams being a linear combination of the N data substreams; and a bank of modulators to modulate the N K-muxed data streams to generate N K-muxed signal streams. The multi-beam antenna comprises beam forming networks to transform the N K-muxed signal streams into transmit beams, and an array of antenna elements to transmit the transmit beams to the access points.
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公开(公告)号：US10116409B2
公开(公告)日：2018-10-30
申请号：US14726662
申请日：2015-06-01
Applicant: SPATIAL DIGITAL SYSTEMS, INC.
Inventor： Donald C. D. Chang
Abstract: A novel terrestrial wireless communications technique for terrestrial portable terminals including hand-held mobile devices and fixed wireless instruments, utilizing a spoke-and-hub communications system, having a plurality of individual hubs and/or base-stations all in communications with the portable terminals. The portable terminals and the hubs are assigned to use incompatible polarity formats in terms of circularly polarity (CP) and linearly polarity (LP). In forward links, a signal processed by the LP ground telecommunications hubs is radiated through multiple antennas with various LP polarities to an individual CP user simultaneously. The multiple paths are organized via assignments of a plurality of polarities, frequency slots, and directions by wavefront multiplexing/demultiplexing techniques such that the same communications assets including frequency spectrum may be re-used by other users. The same polarity diversity methods can be extended to peer-to-peer communications.
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Patent Agency Ranking
公开(公告)号：US20180292539A1
公开(公告)日：2018-10-11
申请号：US16006695
申请日：2018-06-12
Applicant: SPATIAL DIGITAL SYSTEMS, INC.
Inventor： Donald C. D. Chang , Steve K. Chen
IPC: G01S19/21
Abstract: A system for generating and injecting acoustic interference signals to mitigate undesired acoustic noise over a target zone. M pickup sensors pick up acoustic noise signals from one or more noise sources in real time and generate M noise signals, M>1. A beam forming network includes M acoustic beam forming modules to process the M noise signals respectively and generate N acoustic interference signals. N acoustic injectors condition, amplify and inject the N acoustic interference signals over the target zone, N>1. Each of the M acoustic beam forming modules includes a 1-to-N distribution network to transform a respective one of the M noise signals into N signals, and N finite-impulse-response filters to perform amplitude and phase weighting on the respective N signals and generate N intermediate signals which are combined respectively with corresponding intermediate signals generated by remaining M−1 acoustic beam forming modules to generate the N acoustic interference signals.
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公开(公告)号：US10090958B2
公开(公告)日：2018-10-02
申请号：US14791556
申请日：2015-07-06
Applicant: SPATIAL DIGITAL SYSTEMS, INC.
Inventor： Donald C. D. Chang
Abstract: A system is provided for high speed optical fiber data transmission by generating artificial wavefronts along multiple paths exhibiting spatial mutual orthogonality. Multiple independent signal streams are “structured” over a group of different propagation paths that are coherently organized by wavefront multiplexing and dc-multiplexing techniques. Therefore, signal streams with enhanced throughput and reliability may be fully recovered at destinations via embedded diagnostic signals and optimization loops. Multiple optical channels are matched with multiple orthogonal wavefronts created by a signal pre-processor. A receiving end signal post-processor dynamically aligns propagation paths via diagnostic signals and orthogonality of the propagation wavefronts electronically. The multiple optical channels are coherently bonded into a single virtual channel, thereby increasing data bandwidth while reducing interference and unwanted multi-path effects. The wavefront multiplexing and de-multiplexing functions may be performed in a dedicated signal processor or may reside in a general-purpose microprocessor located in the user terminal.
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公开(公告)号：US10069553B2
公开(公告)日：2018-09-04
申请号：US15724152
申请日：2017-10-03
Applicant: SPATIAL DIGITAL SYSTEMS, INC.
Inventor： Donald C. D. Chang , Juo-Yu Lee
IPC: H04B7/06 , H04B7/0413 , H04L5/00 , H04B7/0456
Abstract: A communication system includes a transmitter, one or more active scattering platforms, and one or more remote receivers. The transmitter includes a beam forming network for transforming M signals into a set of shaped beams which are radiated toward the active scattering platforms by transmitter antenna elements. The active scattering platforms receive and re-radiate one or more of the radiated shaped beams toward the receivers. The beam forming network optimizes composite transfer functions under performance constraints. Each composite transfer function is a linear combination of transfer functions. Each transfer function characterizes propagation paths from one transmitter antenna element to one receiving antenna element. Each receiving antenna element is identified by a user element identification index in the transfer functions. Each receiver is identified by a user identification index. The performance constraints are specified for locations identified by the user identification indices or the user element identification indices.
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公开(公告)号：US10027438B2
公开(公告)日：2018-07-17
申请号：US15633752
申请日：2017-06-26
Applicant: SPATIAL DIGITAL SYSTEMS, INC.
Inventor： Juo-Yu Lee , Donald C. D. Chang , Tzer-Hso Lin
Abstract: An apparatus comprises a wavefront muxing processor receiving first and second input signals to generate first and second output signals on first and second communication channels, respectively, the first and second output signals being at a common frequency slot and having relative differential amplitude and phase delays; and an amplitude and phase adjustment element located at one of the first and second communication channels to adjust the relative differential amplitude and phase delays using an adjustment amount to reduce interference in the first and second communication channels. The first output signal is a weighted sum of the first input signal and the second input signal that is phase shifted by a second phase shift. The second output signal is a weighted sum of the second input signal and the first input signal that is phase shifted by a first phase shift. The two output signals are transmitted to a transponder.
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公开(公告)号：US09935647B2
公开(公告)日：2018-04-03
申请号：US15350103
申请日：2016-11-13
Applicant: SPATIAL DIGITAL SYSTEMS, INC.
Inventor： Donald C. D. Chang
IPC: H03M1/12 , H04J14/02 , H03F1/02 , H03F1/32 , H03F3/21 , H03F3/24 , H03F3/68 , H03F3/72 , H04B7/185 , H04B10/118
CPC classification number: H03M1/122 , H03F1/0277 , H03F1/3247 , H03F1/3258 , H03F3/211 , H03F3/24 , H03F3/68 , H03F3/72 , H03F2201/3212 , H03F2203/21106 , H03F2203/21109 , H03F2203/21136 , H03F2203/21145 , H03F2203/21175 , H03F2203/7215 , H03F2203/7224 , H03F2203/7236 , H04B7/18515 , H04B10/118 , H04J14/0223 , H04J14/0227
Abstract: A broadband digital beam forming system comprises a set of Q pre-processing modules, Q being an integer greater than or equal to 2, and a set of M digital beam forming modules in communication with the Q preprocessing modules. Each of the Q preprocessing modules receives a respective one of Q broadband input signal streams and outputs M narrowband signal streams, M being an integer greater than or equal to 2. The total number of narrowband signal streams outputted by the Q pre-processing modules is Q times M. Each of the M digital beam forming modules receives corresponding Q narrowband signal streams of the Q times M narrowband signal streams, and outputs R beam signals, R being an integer greater than or equal to 1. The system further comprises a set of R post-processing modules in communication with the M digital beam forming modules. Each of the R post-processing modules receives M beam signals, each of the M beam signals being a corresponding one of the R beam signals from each of the M digital beam forming modules, and outputs a corresponding broadband output signal.
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