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公开(公告)号：US11140647B2
公开(公告)日：2021-10-05
申请号：US16576369
申请日：2019-09-19
Applicant: Parallel Wireless, Inc.
Inventor： Hemanth Palally , Saikat Senapati , Somasekhar Pemmasani
Abstract: Systems, methods and computer software are disclosed for providing high resolution timing advance estimation based on Physical Random Access Channel (PRACH). An example method includes receiving a preamble signal r(n) having a predetermined sampling frequency and a predetermined length; correlating a down sampled version of the received preamble with a reference preamble sequence c(n) using an FFT method to provide correlation output Ryc; using a peak value P of the correlation output Ryc to detect a preamble ID and a timing advance at a resolution of 24Ts; zero padding sequences Y(k) and C(k) so that they have a predetermined length resulting in sequences Y_hat(k) and C_hat(k), which are 1024-point FFT of y(n) and c(n); performing a maximum likelihood estimation (MLE) to estimate a timing offset; and detecting a peak value out of the R_hat(m) and using a corresponding index Q to provide a timing advance with an accuracy of 2Ts.
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公开(公告)号：US10856177B2
公开(公告)日：2020-12-01
申请号：US16430757
申请日：2019-06-04
Applicant: Parallel Wireless, Inc.
Inventor： Ajay Sharma , Somasekhar Pemmasani
Abstract: A receiver performing a half cyclic prefix (CP) shift on received subframes is disclosed, comprising: an analog to digital conversion (ADC) module; a cyclic prefix (CP) removal module coupled to the ADC module configured to retain a portion of cyclic prefix samples; a fast Fourier transform (FFT) module configured to receive samples from the cyclic prefix removal module, and to perform a FFT procedure on the received samples using a FFT window, the FFT window being shifted ahead based on the retained portion of cyclic prefix samples, to output an orthogonal frequency division multiplexed (OFDM) symbol; and a rotation compensation module coupled to the FFT module, the rotation compensation module configured to perform phase de-rotation of the OFDM symbol.
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公开(公告)号：US20200092835A1
公开(公告)日：2020-03-19
申请号：US16576369
申请日：2019-09-19
Applicant: Parallel Wireless, Inc.
Inventor： Hemanth Palally , Saikat Senapati , Somasekhar Pemmasani
Abstract: Systems, methods and computer software are disclosed for providing high resolution timing advance estimation based on Physical Random Access Channel (PRACH). An example method includes receiving a preamble signal r(n) having a predetermined sampling frequency and a predetermined length; correlating a down sampled version of the received preamble with a reference preamble sequence c(n) using an FFT method to provide correlation output Ryc; using a peak value P of the correlation output Ryc to detect a preamble ID and a timing advance at a resolution of 24Ts; zero padding sequences Y(k) and C(k) so that they have a predetermined length resulting in sequences Y_hat(k) and C_hat(k), which are 1024-point FFT of y(n) and c(n); performing a maximum likelihood estimation (MLE) to estimate a timing offset; and detecting a peak value out of the R_hat(m) and using a corresponding index Q to provide a timing advance with an accuracy of 2Ts.
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公开(公告)号：US12213092B2
公开(公告)日：2025-01-28
申请号：US17494335
申请日：2021-10-05
Applicant: Parallel Wireless, Inc.
Inventor： Hemanth Palally , Saikat Senapati , Somasekhar Pemmasani
IPC: H04W56/00 , H04L27/26 , H04W74/0833
Abstract: Systems, methods and computer software are disclosed for providing high resolution timing advance estimation based on Physical Random Access Channel (PRACH). An example method includes receiving a preamble signal r(n) having a predetermined sampling frequency and a predetermined length; correlating a down sampled version of the received preamble with a reference preamble sequence c(n) using an FFT method to provide correlation output Ryc; using a peak value P of the correlation output Ryc to detect a preamble ID and a timing advance at a resolution of 24Ts; zero padding sequences Y(k) and C(k) so that they have a predetermined length resulting in sequences Y_hat(k) and C_hat(k), which are 1024-point FFT of y(n) and c(n); performing a maximum likelihood estimation (MLE) to estimate a timing offset; and detecting a peak value out of the R_hat(m) and using a corresponding index Q to provide a timing advance with an accuracy of 2Ts.
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公开(公告)号：US11825340B2
公开(公告)日：2023-11-21
申请号：US17109136
申请日：2020-12-01
Applicant: Parallel Wireless, Inc.
Inventor： Ajay Sharma , Somasekhar Pemmasani
CPC classification number: H04W28/04 , H04L5/0007 , H04L25/0202 , H04L27/2607 , H04L27/2665 , H04L27/2678 , H04L27/2691
Abstract: A receiver performing a half cyclic prefix (CP) shift on received subframes is disclosed, comprising: an analog to digital conversion (ADC) module; a cyclic prefix (CP) removal module coupled to the ADC module configured to retain a portion of cyclic prefix samples; a fast Fourier transform (FFT) module configured to receive samples from the cyclic prefix removal module, and to perform a FFT procedure on the received samples using a FFT window, the FFT window being shifted ahead based on the retained portion of cyclic prefix samples, to output an orthogonal frequency division multiplexed (OFDM) symbol; and a rotation compensation module coupled to the FFT module, the rotation compensation module configured to perform phase de-rotation of the OFDM symbol.
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Patent Agency Ranking
公开(公告)号：US20190253293A1
公开(公告)日：2019-08-15
申请号：US16378850
申请日：2019-04-09
Applicant: Parallel Wireless, Inc.
Inventor： Ajay Sharma , Somasekhar Pemmasani
CPC classification number: H04L27/265 , H04J11/005 , H04L5/0051 , H04L25/022 , H04L25/0224 , H04W72/1231
Abstract: A method for measuring channel quality in a wireless transceiver is disclosed, comprising: receiving, at a wireless transceiver, an analog signal from a user equipment (UE); converting the analog signal to a plurality of digital samples at an analog to digital converter (ADC); performing a fast Fourier transform (FFT) on the plurality of digital samples to generate frequency domain samples; identifying an uplink demodulation reference signal (DMRS) symbol; performing channel estimation on the DMRS symbol to identify an estimate of channels; creating a noise covariance matrix from the estimate of channels; and deriving an interference measure from the noise covariance matrix.
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公开(公告)号：US10257008B2
公开(公告)日：2019-04-09
申请号：US15484121
申请日：2017-04-10
Applicant: Parallel Wireless, Inc.
Inventor： Ajay Sharma , Somasekhar Pemmasani
Abstract: A method for measuring channel quality in a Long Term Evolution (LTE) transceiver is disclosed, comprising: receiving, at a Long Term Evolution (LTE) wireless transceiver, an analog signal from a user equipment (UE); converting the analog signal to a plurality of digital samples at an analog to digital converter (ADC); performing a fast Fourier transform (FFT) on the plurality of digital samples to generate frequency domain samples; identifying an uplink demodulation reference signal (DMRS) symbol; performing channel estimation on the DMRS symbol to identify an estimate of channels; creating a noise covariance matrix from the estimate of channels; and deriving an interference measure from the noise covariance matrix.
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公开(公告)号：US11943050B2
公开(公告)日：2024-03-26
申请号：US17874257
申请日：2022-07-26
Applicant: Parallel Wireless, Inc.
Inventor： Mudassar Khan , Ajay Sharma , Somasekhar Pemmasani
CPC classification number: H04L1/0061 , H04L1/0045 , H04W80/02 , H04W80/04 , H04W80/08
Abstract: This disclosure introduces an advancement to the error indication message to provide detailed information about errors in configurations that are arriving from the Layer 2 to the Layer 1. A method is disclosed, comprising: performing physical layer control (PHY) of a wireless signal at a Layer 1 (L1) software module; performing medium access control (MAC) of the wireless signal at a Layer 2 (L2) software module; providing an application programming interface between the L1 software module and the L2 software module for receiving L1 configuration messages and providing error codes to the L2 software module; receiving a L1 configuration message at a Layer 1 software module; and providing an enhanced error code progressively from a L1 software module to the Layer 2 (L2) software module.
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9.发明授权公开(公告)号：US11102044B2
公开(公告)日：2021-08-24
申请号：US16582811
申请日：2019-09-25
Applicant: Parallel Wireless, Inc.
Inventor： Hemanth Palally , Saikat Senapati , Somasekhar Pemmasani , Ramesh Annavajjala
Abstract: Systems, methods and computer software are disclosed for providing high resolution timing advance estimation based on Physical Random Access Channel (PRACH). An example method includes receiving a preamble signal r(n); performing signal conditioning on r(n); down sampling the signal and performing antialiasing filtering to provide a y(n) signal; correlating y(n) with a reference preamble with a reference preamble sequence c(n) to provide correlation output Ryc; using a peak value P of the correlation output Ryc to detect a preamble ID and a timing advance; constructing a sequence s(n) by segmenting r_centered(n) for length L around an index P*24; performing time domain interpolation of c(n) around index P to obtain a sequence c_interpolated(n); performing time domain interpolation between sequences s(n) and c_interpolated(n); detecting a peak position Q of the correlation; and deriving TA as P*24−L/2+q in terms of Ts.
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公开(公告)号：US20190342792A1
公开(公告)日：2019-11-07
申请号：US16430757
申请日：2019-06-04
Applicant: Parallel Wireless, Inc.
Inventor： Ajay Sharma , Somasekhar Pemmasani
Abstract: A receiver performing a half cyclic prefix (CP) shift on received subframes is disclosed, comprising: an analog to digital conversion (ADC) module; a cyclic prefix (CP) removal module coupled to the ADC module configured to retain a portion of cyclic prefix samples; a fast Fourier transform (FFT) module configured to receive samples from the cyclic prefix removal module, and to perform a FFT procedure on the received samples using a FFT window, the FFT window being shifted ahead based on the retained portion of cyclic prefix samples, to output an orthogonal frequency division multiplexed (OFDM) symbol; and a rotation compensation module coupled to the FFT module, the rotation compensation module configured to perform phase de-rotation of the OFDM symbol.
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