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1.发明申请公开(公告)号：US20190028155A1
公开(公告)日：2019-01-24
申请号：US16036372
申请日：2018-07-16
发明人： Jörg Hofrichter , Michael Löhning , Eckhard Ohlmer
IPC分类号： H04B7/0417 , H04B1/40 , H04L1/00 , H01Q1/24
摘要： In a wireless transceiver station having M antennas, designate an antenna as a target reference antenna (TRA) and for each antenna m other than the TRA: define N distinct paths from antenna m to TRA through zero or more intermediate reference antennas, N is two or more, each distinct paths has a distinct associated set of one or more antenna pairs; for each antenna pair of the sets, estimate an effective forward and backward channel response by sending calibration pilots forth and back between the antenna pair and calculate a reciprocity coefficient for the antenna pair using the estimated channel responses; for each of the N distinct paths, calculate a reciprocity coefficient estimate using the reciprocity coefficients calculated for the set of antenna pairs associated with the path; and combine the N calculated reciprocity coefficient estimates to produce a final reciprocity coefficient estimate for antenna pair (m, target reference antenna).
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公开(公告)号：US10218549B1
公开(公告)日：2019-02-26
申请号：US15879369
申请日：2018-01-24
发明人： Michael Löhning , Eckhard Ohlmer
IPC分类号： H04L1/00 , H04L7/00 , H04L27/227 , H04L25/03
摘要： A post-equalization phase tracking unit, for each signal block of a received series: computes beginning absolute phase rotation using equalized preceding pilot symbols; subdivides the block into a time sequence of groups of equalized symbols; initializes accumulated phase associated with the first-in-time group with the absolute phase rotation. For each group, the unit: computes a de-rotated version of each symbol using the previous group's accumulated phase used to blindly estimate a residual group phase; assigns the group's accumulated phase with a sum of the group's residual phase and the previous group's accumulated phase; estimates phase drift within the group by using at least the group's accumulated phase to compute a phase compensation signal. A pre-equalization phase tracking unit computes a phase of autocorrelation between identical-as-transmitted initial/terminal sequence portions; estimates a start phase using the autocorrelation phase and the previous signal block start phase; interpolates start phases to estimate phase drift.
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公开(公告)号：US10257005B2
公开(公告)日：2019-04-09
申请号：US15674059
申请日：2017-08-10
发明人： Michael Löhning , Achim Nahler , Nikhil Kundargi
摘要： An apparatus includes circuitry that processes a subframe as part of a time-domain signal frame structure used for radio frequency communications. The subframe includes a plurality of block symbols each having an associated time-domain guard period and one or more radio frequency (RF) switching guard periods. Each block symbol of the plurality of block symbols is either a common block symbol or a special block symbol. A common block symbol has a common time-domain guard period with all other common block symbols of the subframe. A special block symbol has a time-domain guard period different from the common time-domain guard period. All the special block symbols in the subframe are placed into the one or more RF switching guard periods.
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公开(公告)号：US20180048506A1
公开(公告)日：2018-02-15
申请号：US15674059
申请日：2017-08-10
发明人： Michael Löhning , Achim Nahler , Nikhil Kundargi
CPC分类号： H04L27/2607 , H04L5/0048 , H04L5/005 , H04L5/14 , H04L27/2602 , H04L27/2626
摘要： An apparatus includes circuitry that processes a subframe as part of a time-domain signal frame structure used for radio frequency communications. The subframe includes a plurality of block symbols each having an associated time-domain guard period and one or more radio frequency (RF) switching guard periods. Each block symbol of the plurality of block symbols is either a common block symbol or a special block symbol. A common block symbol has a common time-domain guard period with all other common block symbols of the subframe. A special block symbol has a time-domain guard period different from the common time-domain guard period. All the special block symbols in the subframe are placed into the one or more RF switching guard periods.
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公开(公告)号：US10312978B2
公开(公告)日：2019-06-04
申请号：US16036372
申请日：2018-07-16
发明人： Jörg Hofrichter , Michael Löhning , Eckhard Ohlmer
IPC分类号： H04W52/08 , H04B7/0417 , H01Q1/24 , H04L1/00 , H04B1/40
摘要： In a wireless transceiver station having M antennas, designate an antenna as a target reference antenna (TRA) and for each antenna m other than the TRA: define N distinct paths from antenna m to TRA through zero or more intermediate reference antennas, N is two or more, each distinct paths has a distinct associated set of one or more antenna pairs; for each antenna pair of the sets, estimate an effective forward and backward channel response by sending calibration pilots forth and back between the antenna pair and calculate a reciprocity coefficient for the antenna pair using the estimated channel responses; for each of the N distinct paths, calculate a reciprocity coefficient estimate using the reciprocity coefficients calculated for the set of antenna pairs associated with the path; and combine the N calculated reciprocity coefficient estimates to produce a final reciprocity coefficient estimate for antenna pair (m, target reference antenna).
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公开(公告)号：US10218548B1
公开(公告)日：2019-02-26
申请号：US15879318
申请日：2018-01-24
发明人： Michael Löhning , Eckhard Ohlmer
IPC分类号： H04L1/00 , H04L7/00 , H04L27/227 , H04L25/03
摘要： A pre-equalization phase tracking unit, for each signal block of received series: computes autocorrelation between portion of identical-as-transmitted initial and terminal sequences and computes phase of autocorrelation; estimates start phase of block processing window using autocorrelation phase and start phase of previous signal block in series; estimates phase drift within window by interpolating using estimated start phases of at least the signal block and next signal block in series; and computes phase compensation signal using estimated phase drift. A post-equalization phase tracking unit subdivides the block into time sequence of groups of equalized symbols. For each group: compute de-rotated version of each symbol using previous group's accumulated phase to blindly estimate residual group phase; assign group's accumulated phase with sum of group's residual phase and previous group's accumulated phase; estimate phase drift within group by using at least group's accumulated phase to compute phase compensation signal.
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