-
1.发明申请公开(公告)号：US20170207934A1
公开(公告)日：2017-07-20
申请号：US15000476
申请日：2016-01-19
CPC分类号： H04L25/03834 , H04L25/03006 , H04L25/0314 , H04L25/03165 , H04L25/0384 , H04L25/03847 , H04L27/2017
摘要： New partial response signaling systems and methods for high spectral efficiency communications are described. In a first implementation, a communication system includes a partial response signaling transmitter and a nonlinear satellite transponder. The partial response signaling transmitter includes a partial response transmit filter configured to convert complex-valued data symbols to a transmit signal using a partial response pulse shaping function; and a modulator configured to modulate the transmit signal onto a carrier wave. The transponder receives and non-linearly amplifies the modulated transmit signal for broadcast to receivers. In a second implementation, a receiver includes circuitry for downconverting a received input signal; a partial response filter with a partial response impulse function for filtering the downconverted signal; circuitry for downsampling the partial response filtered signal; circuitry for equalizing the downsampled signal; and a linear and non-linear interference cancellation module including circuitry for removing linear and non-linear ISI in the input signal.
-
2.发明公开公开(公告)号：US20240224116A1
公开(公告)日：2024-07-04
申请号：US18148565
申请日：2022-12-30
CPC分类号： H04W28/06 , H03M7/02 , H04B7/18513 , H04L1/0061 , H04L25/03834
摘要： Systems and methods are described for generating and implementing pulse-shaping filters for efficient utilization of limited spectral resources in wireless communication systems. Wireless communication systems operating at high spectral efficiency conventionally use pulse shaping filters that rely on Nyquist waveforms for good main lobe performance with low inter-symbol interference (ISI) power. Conventional uses of non-Nyquist waveforms typically involve an orthogonalization process to convert those non-Nyquist waveforms to Nyquist waveforms for ISI free performance. Embodiments of pulse shaping filters described herein generate a non-Nyquist partial response (NNPR) transmit filter and/or matched receive filter based on applying a tunable second-weighted orthogonalization to a tunable first-weighted non-Nyquist waveform to obtain a pulse-shaping waveform with parametric control over throughput and power penalty.
-
公开(公告)号：US10999048B1
公开(公告)日：2021-05-04
申请号：US16732007
申请日：2019-12-31
发明人： Bassel F. Beidas
IPC分类号： H04L7/00
摘要： Some implementations of the disclosure are directed to symbol-timing tracking systems and methods. A symbol-timing tracking system may include: an ADC to generate a digital signal by sampling an analog signal received at a receiver; an interpolator to adjust a sampling rate of the digital signal; a receive filter to apply a receive filtering function to the digital signal to generate a filtered signal; a timing error detector configured to generate a timing error signal from the filtered signal; a high-order loop filter to filter the timing error signal to generate a filtered timing error signal; and a numerically controlled oscillator to control timing data based on the filtered timing error signal and provide the timing data to the interpolator, wherein the interpolator is to correct for timing of the digital signal and adjust the sampling rate of the digital signal based on the timing data.
-
公开(公告)号：US10530540B2
公开(公告)日：2020-01-07
申请号：US15849361
申请日：2017-12-20
IPC分类号： H04L5/00 , H04L25/06 , H04L27/26 , H04W84/06 , H04L12/433 , H04L25/03 , H04L25/02 , H04W88/06
摘要： Implementations described herein are directed to satellite transmitters and receivers for applying OFDM-like signaling in broadband satellite transmissions. In such systems, one or more data signals may be shaped and composited into a composite data signal at an OFDM-like transmitter for transmission over a satellite channel. The data signals that are carried over the satellite channel by the composited signal may have their own carrier, and each signal may carry multiple OFDM subcarriers. Further implementations are directed to correcting for distortion in satellite communications systems that utilize OFDM-like signaling. This distortion correction may account for the linear and nonlinear distortion introduced by the high power amplifier of a satellite receiving a composite signal, the linear and nonlinear distortion caused by the interaction of the signals in the composite, the linear and nonlinear distortion caused by the interaction between OFDM subcarriers, and/or the linear and nonlinear distortion caused by inter-carrier interference.
-
5.发明授权公开(公告)号：US09742599B2
公开(公告)日：2017-08-22
申请号：US15000476
申请日：2016-01-19
CPC分类号： H04L25/03834 , H04L25/03006 , H04L25/0314 , H04L25/03165 , H04L25/0384 , H04L25/03847 , H04L27/2017
摘要： New partial response signaling systems and methods for high spectral efficiency communications are described. In a first implementation, a communication system includes a partial response signaling transmitter and a nonlinear satellite transponder. The partial response signaling transmitter includes a partial response transmit filter configured to convert complex-valued data symbols to a transmit signal using a partial response pulse shaping function; and a modulator configured to modulate the transmit signal onto a carrier wave. The transponder receives and non-linearly amplifies the modulated transmit signal for broadcast to receivers. In a second implementation, a receiver includes circuitry for downconverting a received input signal; a partial response filter with a partial response impulse function for filtering the downconverted signal; circuitry for downsampling the partial response filtered signal; circuitry for equalizing the downsampled signal; and a linear and non-linear interference cancellation module including circuitry for removing linear and non-linear ISI in the input signal.
-
公开(公告)号：US12095536B2
公开(公告)日：2024-09-17
申请号：US18184375
申请日：2023-03-15
发明人： Bassel F. Beidas
IPC分类号： H04B7/06 , H04B7/0413 , H04B7/185 , H04B7/19
CPC分类号： H04B7/0626 , H04B7/0413 , H04B7/18513 , H04B7/19
摘要： A system and method for providing multi-input multi-output (MIMO) feeder links for a multibeam satellite system. The method includes configuring a X×Y MIMO antenna system using X-antennae having dominant line-of-sight (LoS) of Y-antennae; transmitting, simultaneously, a Tx signal as X Tx signals on a MIMO channel with the X-antennae; receiving the X Tx signals on the MIMO channel with the Y-antennae as Y Rx signals, wherein each of the Y-antennae generate one of the Y Rx signals; and ground-interference processing the X Tx signals or the Y Rx signals to recover the Tx signal; satellite-interference processing the X Tx signals or the Y Rx signals to recover the Tx signal. In the method, the ground interference processing includes countermeasures as either pre-interference processing when the X-antennae are disposed on a ground or post-interference processing when the X-antennae are disposed in a Geosynchronous orbit satellite. Gateway diversity for multiple MIMO feeder links utilizing these countermeasures improves weather-resiliency and significantly enhances overall satellite network availability.
-
公开(公告)号：US20230059018A1
公开(公告)日：2023-02-23
申请号：US17566501
申请日：2021-12-30
发明人： Bassel F. Beidas
IPC分类号： H04B7/06 , H04B7/0417 , H04B7/185
摘要： Some implementations describe a method including: receiving, by multiple receivers of multiple gateways of a ground receiver system, from multiple transmitters of a satellite over a downlink of a LoS MIMO feeder link, multiple RF signals; obtaining, at the ground receiver system, from the RF signals, preamble signals and pilot signals including first sequences of pilot symbols associated with second sequences of pilot symbols transmitted by the transmitters; estimating, based on the first sequences of pilot symbols and second sequences of pilot symbols, first channel state information (CSI) of the pilot signals; estimating, using the first CSI, frequency offsets and phase offsets of links between the receivers and the transmitters; adjusting, based at least on the frequency offsets and the phase offsets, the preamble signals to obtain adjusted preamble signals; and estimating, at the ground receiver system, using the adjusted preamble signals, second CSI of the downlink.
-
公开(公告)号：US10237016B2
公开(公告)日：2019-03-19
申请号：US15374418
申请日：2016-12-09
摘要： A receiver, transmitter and system are programmed to communicate based on a signal including a plurality of signal components associated respectively with a plurality of subcarriers over a communications channel. The receiver is programmed to determine, from the plurality of subcarriers, a subcarrier subject to interference and erase the signal component associated with the subcarrier subject to interference. The receiver is further programmed to reconstruct the signal based on the plurality of first signal components excluding the erased first signal component.
-
公开(公告)号：US20180115390A1
公开(公告)日：2018-04-26
申请号：US15374418
申请日：2016-12-09
CPC分类号： H04L1/0041 , H03M13/1105 , H03M13/1165 , H04B7/185 , H04B7/18519 , H04B7/1858 , H04B7/18582 , H04L1/0045 , H04L1/0047 , H04L1/0057 , H04L1/0058
摘要： A receiver, transmitter and system are programmed to communicate based on a signal including a plurality of signal components associated respectively with a plurality of subcarriers over a communications channel. The receiver is programmed to determine, from the plurality of subcarriers, a subcarrier subject to interference and erase the signal component associated with the subcarrier subject to interference. The receiver is further programmed to reconstruct the signal based on the plurality of first signal components excluding the erased first signal component.
-
公开(公告)号：US20190013892A1
公开(公告)日：2019-01-10
申请号：US15643418
申请日：2017-07-06
发明人： Liping Chen , Lin-Nan Lee , Bassel F. Beidas , Donglei Fan
摘要： A transmitter, including a signal processor programmed to generate, based on input serial data, for each of an integer number of subcarriers mutually orthogonal to each other, a respective first parallel data stream. The signal processor is further programmed to modulate each of the integer number of subcarriers respectively with the respective parallel stream to generate the integer number of data-modulated subcarriers. The signal processor is further programmed to modulate a single carrier occupying a same bandwidth as the integer number of subcarriers with a unique word and one or more pilot symbols to generate a second signal. The signal processor combines the first signal and second signal to generate a third signal. The signal processor generates an output signal by applying a transmit filter to the third signal.
-
-
-
-
-
-
-
-
-
搜索结果
13 条记录 (耗时 0.021 秒)
