WO2019240790A1 - Annulation de brouillage inter-flux mimo (entrées multiples et sorties multiples) - Google Patents

Annulation de brouillage inter-flux mimo (entrées multiples et sorties multiples) Download PDF

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Publication number
WO2019240790A1
WO2019240790A1 PCT/US2018/037306 US2018037306W WO2019240790A1 WO 2019240790 A1 WO2019240790 A1 WO 2019240790A1 US 2018037306 W US2018037306 W US 2018037306W WO 2019240790 A1 WO2019240790 A1 WO 2019240790A1
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WO
WIPO (PCT)
Prior art keywords
antennas
transmitting
receiving
channel
propagation delays
Prior art date
Application number
PCT/US2018/037306
Other languages
English (en)
Inventor
Qi Qu
Padinjaremannil Sam ALEX
Ali Yazdan Panah
Abhishek Tiwari
Yan Yan
Hongyu ZHOU
Pratheep Bondalapati
Original Assignee
Facebook, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Facebook, Inc. filed Critical Facebook, Inc.
Priority to EP18922424.9A priority Critical patent/EP3788722A4/fr
Priority to CN201880094648.6A priority patent/CN112997417A/zh
Priority to PCT/US2018/037306 priority patent/WO2019240790A1/fr
Publication of WO2019240790A1 publication Critical patent/WO2019240790A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0891—Space-time diversity
    • H04B7/0894—Space-time diversity using different delays between antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0845—Weighted combining per branch equalization, e.g. by an FIR-filter or RAKE receiver per antenna branch

Definitions

  • the described embodiments relate generally to wireless communications.
  • the described embodiments relate to systems, methods and apparatuses for MIMO inter-stream interference cancellation.
  • Wireless networks are being deployed that include long-range propagation of wireless signals.
  • Long-range MIMO (multiple-input, multiple-output) channel wireless systems are subject to different interference conditions than typical short-range MIMO systems, such as, LTE (long term evolution) and WiFi (wireless fidelity) wireless systems.
  • LTE long term evolution
  • WiFi wireless fidelity
  • An embodiment includes a method.
  • the method includes determining a channel matrix between a plurality of transmitting antennas of a transmitter and a plurality of receiving antennas of a receiver, determining a plurality of channel propagation delays based on a propagation delay between each of the plurality of transmitting antennas and each of the plurality of receiving antennas, preprocessing, by the transmitter, streams of symbols for each transmitting antenna for transmission based on the plurality of channel propagation delays and based on the channel matrix, and transmitting, by the transmitter, the preprocessed symbol streams through the plurality of transmitting antennas.
  • An embodiment includes another method.
  • the method includes determining a channel matrix between a plurality of transmitting antennas of a transmitter and a plurality of receiving antennas of a receiver, determining a plurality of channel propagation delays based on a propagation delay between each of the plurality of transmitting antennas and each of the plurality of receiving antennas, receiving, through the channel, streams of symbols through each of the plurality of receiving antennas, and processing, by the receiver, the streams of symbols for each receiving antenna based on the plurality of channel propagation delays and based on the channel matrix.
  • Another embodiment includes a transmitter.
  • the transmitter includes a plurality of radio frequency (RF) chains, wherein the plurality of RF chains is connected to a plurality of transmitting antennas.
  • RF radio frequency
  • the transmitter further includes a controller.
  • the controller is operative to determine a channel matrix between the plurality of transmitting antennas and a plurality of receiving antennas of a receiver, determine a plurality of channel propagation delays based on a propagation delay between each of the plurality of transmitting antennas and each of the plurality of receiving antennas, preprocess a stream of symbols for each transmitting antenna for transmission based on the plurality of channel propagation delays and based on the channel matrix, and transmit the preprocessed symbol streams through the plurality of transmitting antennas.
  • the receiver includes a plurality of receiving antenna, wherein the plurality of receiving antennas is connected to a plurality of RF chains.
  • the receiver further includes a controller.
  • the controller is operative to determine a channel matrix between a plurality of transmitting antennas of a transmitter and the plurality of receiving antennas of a receiver, determine a plurality of channel propagation delays based on a propagation delay between each of the plurality of transmitting antennas and each of the plurality of receiving antennas, receive streams of symbols through each of the plurality of receiving antennas, and process the streams of symbols for each receiving antenna based on the plurality of channel propagation delays and based on the channel matrix.
  • Figure 1 A shows a long-range MIMO system, according to an embodiment.
  • Figure 1B shows a long-range MIMO system, according to another
  • Figure 2 shows a MIMO system and a channel matrix of the MIMO system, according to an embodiment.
  • Figure 3 shows a MIMO system and a propagation delays associated with the
  • Figure 4A shows a MIMO long-range system that includes transmitters located on a cycling drone, according to another embodiment.
  • Figure 4B is a plot that depicts the changing time delay difference between transmitting signals for the cycling drone of Figure 4A, according to an embodiment.
  • Figure 5A is a plot that depicts delay times for a multipath component after inter-stream interference cancellation processing, according to an embodiment.
  • Figure 5B is a plot that depicts delay times for a multipath component after inter-stream interference cancellation processing, according to an embodiment.
  • Figure 6 shows a transmitter that includes transmit preprocessing, according to an embodiment.
  • Figure 7 shows a receiver that includes receive post-processing, according to an embodiment.
  • Figure 8 is a flow chart that includes acts of a method of transmitter preprocessing, according to an embodiment.
  • Figure 9 is a flow chart that includes acts of a method of receiver post processing, according to an embodiment.
  • either symbol streams for transmission through a MIMO system or symbol streams received through a MIMO system are processed using differences in propagation delay between different of a plurality of transmitting antennas and receiving antennas of the MIMO system, and a channel matrix of the MIMO system.
  • Figure 1 A shows a long-range MIMO system, according to an embodiment.
  • the embodiment includes a satellite 110 that includes multiple antennas 112, 114, and multiple antennas 122, 124 located on ground. Further, the receiving antennas are physical spaced apart by a large distance.
  • This MIMO system is different than typical MIMO systems in that the distances between the transmitting antenna and the receiving antennas is large, and the antenna spacing is large, and therefore, the difference in the signal flight time between the transmitting antennas and the receiving antennas of the wireless transmission signals is much larger than the time duration of the symbols of symbol streams of the wireless transmission signals.
  • the in-flight travel time of a symbol transmitted from the antenna 112 of the satellite 110 and received by the antenna 122 on the ground is different than the in-flight travel time of a symbol transmitted from the antenna 114 of the satellite 110 and received by the antenna 122 on the ground by multiples of the time durations of the transmitted symbols.
  • long-range wireless systems can suffer from time misaligned interference due to the misalignment of the received streams due to the differences in in-flight travel times of the different transmitted streams.
  • a long-range wireless system is a wireless system in which the differences in the in-flight propagation delays of the different streams is greater than a multiple of the time durations of the symbols of the stream of symbols.
  • the exemplary distance between the transmitting antennas and the receiving antennas is 1200 Kilometers and the distance between the receiving antennas (on the ground) is 1200 Meters.
  • the distances traveled by the wireless signal is large enough that the differences in the time traveled by symbol streams transmitted by the different transmitting antennas and received by a receiving antenna is greater than multiple time durations of the symbols of the symbol streams.
  • the satellite is in motion, and therefore, the propagation times can also be changing.
  • Figure 1B shows a long-range MIMO system, according to another
  • This embodiment includes a drone cycling over the earth. Similar to the system of Figure 1 A, the distances traveled by the wireless signal is large enough that the differences in the time traveled by symbol streams transmitted by the different transmitting antennas and received by a receiving antenna is greater than the time duration of multiple of the symbols of the symbol streams. Further, the drone is in motion, and therefore, the propagation times can also be changing.
  • the MIMO systems of the described embodiments can include unique characteristics.
  • the carrier frequencies are as high as 70 to 85 Gigahertz.
  • the distances between the transmitters and the receivers are 30 - 1200 kilometers.
  • a separation distance between antennas can be large based on the Rayleigh criteria for a LOS (line-of-sight) MIMO system. The combinations of the large distances result in large propagation delays between the transmitting antennas and the receiving antennas. To satisfy the Rayleigh criteria, the following equation is satisfied:
  • Figure 2 shows a MEMO system and a channel matrix of the MEMO system, according to an embodiment.
  • Dt represents the physical distance between the transmitting antennas and Dr represents the physical distance between receiving antennas.
  • a channel matrix FI is formed between the transmitting antennas Tx l Tx N and the receiving antennas Rxi, Rx M
  • the channel matrix includes the elements hu, h lM , hm, h 2 2. That is, for an ideal LOS MEMO system:
  • the channel matrix can be determined, for example, through training of the channel which includes transmitting known pilot symbols and measuring the effects of the channel on the pilot symbols at the receiver. For an embodiment, the channel matrix is determined periodically. For an embodiment, the channel matrix is determined at the receiver, and communicated back to the transmitter. That is, a controller of the transmitter obtains the channel matrix by receiving or retrieving the channel matrix from somewhere else. For an embodiment, reciprocity of the transmission channel is assumed, and the channel matrix is determined by the transmitter. Further, for an embodiment, the propagation delays are determined at the receiver. The transmitter then obtains the propagation delays by accessing the propagation delays from somewhere else. For an embodiment, reciprocity of the propagation delays is assumed, and the transmitter obtains the propagation delays be directly determining the propagation delays. [0029] Figure 3 shows a MIMO system and a propagation delays associated with the
  • tl 1 represents a propagation delay of a wireless signal transmitted from transmitting antenna Txl 310 and received by receiving antenna Rxl 330
  • tl2 represents a propagation delay of a wireless signal transmitted from transmitting antenna Tx2 320 and received by receiving antenna Rxl 330
  • t21 represents a propagation delay of a wireless signal transmitted from transmitting antenna Txl 310 and received by receiving antenna Rx2 340
  • t22 represents a propagation delay of a wireless signal transmitted from transmitting antenna Tx2 320 and received by receiving antenna Rx2 340.
  • the differences between the propagation travel time greater than multiple time durations of symbols of symbol streams of the transmitted signals.
  • the difference between propagation delays can be as great as the time duration of 40 symbols of the symbol streams.
  • a long-range wireless system is a wireless system in which the differences in the in-flight propagation delays of the different streams is greater than a multiple of the durations of the symbols of the stream of symbols.
  • the propagation delays tn, t l2 , t 2l , and t 22 can be estimated or measured. For example, based on known locations of the transmitting antennas 310, 320 and known locations of the receiving antennas 330, 340, the distances between each of the transmitting antennas 310, 320, and each of the receiving antennas 330, 340 can be estimated. The propagation delays tn, t l2 , t 2l , and t 22 can be estimated based on the estimated distances. For an embodiment, the locations of the transmitting antennas and/or locations of the receiving antennas are determined by GPS (global positioning system) receivers located at the transmitting antennas and/or the receiving antennas.
  • GPS global positioning system
  • the propagation delays tn, t l2 , t 2i , and t 22 can be estimated or measured by transmitting by each of the transmitting antennas 310, 320 symbols with known characteristics. Signals received by the receiving antennas 330, 340 can be correlated to determine the propagation delays.
  • Figure 4A shows a MIMO long-range system that includes transmitting antennas Al, A2 located on a cycling drone 410, according to another embodiment.
  • a top- view depicts a radius R of the cycling path 420 of the drone 410.
  • a distance D depicts on offset between the ground location of the receiving antennas Gl, G2 and the center point of the cycling path 420 of the drone 410.
  • the side-view depicts the distance H of the cycling drone 410
  • Figure 4B is a plot that depicts the changing time delay difference between transmitting signals for the cycling drone of Figure 4A, according to an embodiment. That is, due to the motion of the drone, the propagation delay times of the transmission signals vary over time. For example, the plots of Figure 4B show the variation of the differences between t 2i - 1 22 and ti 2 - tn as the drone circling angle changes as the drone cycles.
  • the rate at which the differences in the propagation delays change is very small relative to absolute time, and it is easy to perform real-time estimates of the propagation delays.
  • the propagation delays change less than a predetermined rate.
  • the rate in which the differences between the propagation delays change is less than a threshold.
  • a first steam of symbols is associated with a first transmitting antenna
  • a second stream of symbols is associated with a second transmitting antenna.
  • the differences in propagation delay between a first transmitting antenna and a first receiving antenna and a second transmitting antenna and the first receiving antenna is greater that multiple time durations a symbol of the first and second streams of symbols.
  • the differences in propagation delay between the first transmitting antenna and a second receiving antenna and the second transmitting antenna and the second receiving antenna is greater that multiple time durations a symbol of the first and second streams of symbols.
  • the transmitting antennas and the receiving antenna a physically located such that this relationship between the propagation delays holds.
  • At least some embodiments include N streams of symbols associated with N transmitting antennas.
  • At least some embodiments include preprocessing, by the transmitter, streams of symbols (assume a stream for each transmit antenna) for transmission based on the plurality of channel propagation delays and based on the channel matrix.
  • the propagation delays can be determined in one or more ways.
  • the channel matrix can be determined in one more ways.
  • a least some embodiments include transmitting, by the transmitter, the preprocessed symbols streams through the plurality of transmitting antennas.
  • the preprocessing, by the transmitter, of a stream of symbols for transmission includes for a symbol stream of each transmitting antenna, linearly combining a scaled version of the symbol stream with a scaled and delayed version of one or more symbol streams of other of the plurality of transmitting antennas, wherein a delay of the delayed version of symbol streams of the other of the plurality of transmitting antennas is determined based on the plurality of channel propagation delays.
  • the channel matrix can be given as:
  • Si 71(1,:) x (symbol of the first stream of symbols);
  • s 2 F(2,:) x (symbol of the second stream of symbols);
  • / ' is selected so that:
  • the first transmitting antenna Txl transmits:
  • si c* si(t) - a* s 2 (t-(t 12 - tn)); [0052] and the second transmitting antenna Tx2 transmits:
  • s 2 d* s 2 (t) - b* si(t-(t 2i - t 22 )).
  • the receive symbol streams are;
  • r 2 (t) h 22 *d*s 2 (t) - h 2i *a*s 2 (t - t 21 - t 12 + 1 22 + tn).
  • the interference portion of the received symbol ri(t) is: - hi 2 *b*Si(t - 1 21 - 1 12 + 1 22 + t u ).
  • the interference portion of the received symbol r 2 (t) is: - h 2i *a*s 2 (t - t 2l - t l2 + 1 22 + tn).
  • Figure 5A is a plot that depicts delay times for a multipath component after inter-stream interference cancellation processing, according to an embodiment. That is, Figure 5A is a plot of the interfering portion for the system of Figure 1 A.
  • Figure 5B is a plot that depicts delay times for a multipath component after inter-stream interference cancellation processing, according to an embodiment. That is, Figure 5b is a plot of the interfering portion for the system of Figure 1B.
  • the transmit processing reduces the inter-stream interference to be negligible. That is, the inter-stream interference is mitigated (for the ideal case, mathematically eliminated) while introducing a negligible multipath component. That is, the transmit processing reduces interference portions of the reduced signal to be less than a threshold amount.
  • the values of (t 22 + tn- ti 2 - t 2l ) of Figures 5A and 5B are in the orders of picoseconds, whereas the propagation delays for the proposed multiple transmit antennas, multiple receive antennas systems are in the orders of nanoseconds. Accordingly, the inter symbol interference is reduced to a relatively low (less than a threshold) level.
  • the propagation delays are determined by the physical locations and distances between the transmitter antennas and the receiver antennas.
  • the symbol durations are set buy the communication system.
  • the communication system includes millimeter wave communication system having a bandwidth of up to 2 GHz and a sampling rate of up to 2 GHz.
  • each of the receiving antennas operates independently. That is, each antenna receives a symbol stream and does not need to do any post-processing that is dependent on another symbol stream of another receiving antenna.
  • an embodiment includes receiver processing of received symbols or streams that includes inter-stream interference cancellation.
  • At least some embodiments include receiving, through the channel, streams of symbols through each of the plurality of receiving antennas, and processing, by the receiver, the streams of symbols for each receiving antenna based on the plurality of channel propagation delays and based on the channel matrix.
  • the differences in propagation delay between a first transmitting antenna and a first receiving antenna and a second transmitting antenna and the first receiving antenna is greater that multiple time durations a symbol of the streams of symbols.
  • the processing, by the receiver, a stream of symbols includes for each symbol stream of each receiving antenna, linearly combining a scaled version of the symbol stream with a scaled and delayed version of symbol streams of other of the plurality of receiving antennas, wherein a delay of the delayed version of symbol streams of other of the plurality of receiving antennas is determined based on the plurality of channel propagation delays.
  • the propagation delays between the transmitting antennas and the receiving antennas can be estimated or measured. For example, based on known locations of the transmitting antennas and known locations of the receiving antennas, the distances between each of the transmitting antennas and each of the receiving antennas can be estimated. If the transmitting antennas or the receiving antennas are in motion, a global positioning system (GPS) can be used to monitor the location of either the transmitting antennas or the receiving antennas.
  • GPS global positioning system
  • the drone 410 of Figure 4 can include a GPS receiver that determines the exact location of the transmitting antennas.
  • the receiving antennas may be fixed on the ground. Therefore, the distances between the transmitting antennas and the receiving antennas can be constantly (repeatedly) estimated.
  • the propagation delays can be estimated based on the estimated distances.
  • the propagation delays tn, ti 2 , t 2i , and t 22 can be estimated or measured by transmitting by each of the transmitting antennas 310, 320 symbols with known characteristics. Signals received by the receiving antennas 330, 340 can be correlated to determine the propagation delays.
  • Figure 6 shows a transmitter 610 that includes transmit preprocessing, according to an embodiment.
  • the transmitter 610 receives N symbol streams for transmission.
  • the transmitter 610 preprocesses the N symbol streams based on the estimated propagation delays and the channel matrix.
  • the channel matrix For an embodiment, the
  • preprocessing includes for a symbol stream of each transmitting antenna, linearly combining a scaled version of the symbol stream with a scaled and delayed version of one or more symbol streams of other of the plurality of transmitting antennas, wherein a delay of the delayed version of symbol streams of the other of the plurality of transmitting antennas is determined based on the plurality of channel propagation delays.
  • the preprocessed symbol streams are then transmitted through transmitting antennas (Antl - AntN).
  • Figure 7 shows a receiver 720 that includes receive post-processing, according to an embodiment. It is to be understood that the embodiment of Figure 7 can be exclusive in operation from the embodiment of Figure 6. That is, for an embodiment, a system that includes a transmitter and a receiver may include pre-processing of the symbol streams as described, or post-processing of the symbol streams as described.
  • the receiver 720 receives M symbol streams through receiving antennas (Antl
  • FIG. 8 is a flow chart that includes acts of a method of transmitter preprocessing, according to an embodiment.
  • a first step 810 includes determining a channel matrix.
  • the transmitter receives the channel matrix.
  • the transmitter retrieves the channel matrix.
  • the channel matrix is determined by training a transmission channel between a plurality of transmitting antennas of a transmitter and a plurality of receiving antennas of a receiver.
  • the training includes transmitting known pilot symbols be the transmitting antennas and characterizing the channel based on reception of the known pilot symbols at the receiver of the receiving antennas. The receiver than communicates the channel matrix back to the transmitter.
  • a second step 820 includes determining a plurality of channel propagation delays based on a propagation delay between each of the plurality of transmitting antennas and each of the plurality of receiving antennas.
  • the transmitter receives the plurality of channel propagation delays.
  • the transmitter retrieves the plurality of channel propagation delays.
  • the determining the propagation delays includes transmitting known pilot symbols be the transmitting antennas and
  • the receiver than communicates the propagation delays back to the transmitter.
  • a third step 830 includes preprocessing, by the transmitter, streams of symbols for each transmitting antenna for transmission based on the plurality of channel propagation delays and based on the channel matrix.
  • a fourth step 840 includes transmitting, by the transmitter, the preprocessed symbol streams through the plurality of transmitting antennas.
  • the differences in propagation delay between a first transmitting antenna and a first receiving antenna and a second transmitting antenna and the first receiving antenna is greater than multiple time durations a symbol of the streams of symbols. Further, for an embodiment, the differences in propagation delay between a second transmitting antenna and a first receiving antenna and the second transmitting antenna and a second receiving antenna is greater that multiple time durations a symbol of the streams of symbols.
  • the preprocessing, by the transmitter, the stream of symbols for transmission includes for a symbol stream of each transmitting antenna, linearly combining a scaled version of the symbol stream with a scaled and delayed version of one or more symbol streams of other of the plurality of transmitting antennas, wherein a delay of the delayed version of symbol streams of the other of the plurality of transmitting antennas is determined based on the plurality of channel propagation delays.
  • the scaled version of the symbol stream and the scaled version of the symbol streams of other of the plurality of transmitting antennas are determined based on a precoding matrix, wherein the precoding matrix is determined based on the channel matrix.
  • the precoding matrix is additionally determined based on a zero forcing function.
  • the precoding matrix is additionally determined based on an SINR (signal to interference and noise ratio) maximization criteria.
  • a least some embodiments further include independently receiving symbol streams at each of the receiving antennas.
  • At least some embodiments further include continually estimating a location of one or more of the transmitting antennas, and updating values of the plurality of channel propagation delays.
  • At least some embodiments further include continually updating values of the plurality of propagation delays comprising transmitting a signal from at least one of the transmitting antennas and correlating versions of signals received at the plurality of receiving antennas.
  • the plurality of transmitting antennas is located on a flying drone which circles a center point.
  • the plurality of transmitting antennas is located on one or more satellites.
  • Figure 9 is a flow chart that includes acts of a method of receiver post- processing, according to an embodiment.
  • a first step 910 includes determining a channel matrix between a plurality of transmitting antennas of a transmitter and a plurality of receiving antennas of a receiver.
  • a second step 920 includes determining a plurality of channel propagation delays based on a propagation delay between each of the plurality of transmitting antennas and each of the plurality of receiving antennas.
  • a third step 930 includes receiving, through the channel, streams of symbols through each of the plurality of receiving antennas.
  • a fourth step 940 includes processing, by the receiver, the streams of symbols for each receiving antenna based on the plurality of channel propagation delays and based on the channel matrix.
  • the differences in propagation delay between a first transmitting antenna and a first receiving antenna and a second transmitting antenna and the first receiving antenna is greater that multiple time durations a symbol of the streams of symbols.
  • the processing, by the receiver, the stream of symbols includes for each symbol stream of each receiving antenna, linearly combining a scaled version of the symbol stream with a scaled and delayed version of symbol streams of other of the plurality of receiving antennas, wherein a delay of the delayed version of symbol streams of other of the plurality of receiving antennas is determined based on the plurality of channel propagation delays.
  • the scaled version of the symbol stream and the scaled version of the symbol streams of other of the plurality of receiving antennas are determined based on a precoding matrix, wherein the precoding matrix is determined based on the channel matrix and a zero forcing function.
  • At least some embodiments further include continually estimating a location of one or more of the transmitting antennas, and updating values of the plurality of channel propagation delays.
  • At least some embodiments further include continually updating values of the plurality of propagation delays comprising transmitting a signal from at least one of the transmitting antennas and correlating versions of signals received at the plurality of receiving antennas.
  • the plurality of transmitting antennas is located on a flying drone which circles a center point.
  • the plurality of transmitting antennas is located on one or more satellites.

Abstract

L'invention concerne des appareils, des procédés, et des systèmes pour l'annulation d'un brouillage inter-flux MIMO. Un procédé consiste à : déterminer une matrice de voies entre une pluralité d'antennes d'émission d'un émetteur et une pluralité d'antennes de réception d'un récepteur; déterminer une pluralité de retards de propagation sur la voie d'après un retard de propagation entre chacune de la pluralité d'antennes d'émission et chacune de la pluralité d'antennes de réception; prétraiter, par l'émetteur, un flux de symboles de chaque antenne d'émission pour une transmission basée sur la pluralité de retards de propagation sur la voie et la matrice de voies; et transmettre, par l'émetteur, les flux de symboles prétraités, via la pluralité d'antennes d'émission.
PCT/US2018/037306 2018-06-13 2018-06-13 Annulation de brouillage inter-flux mimo (entrées multiples et sorties multiples) WO2019240790A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP18922424.9A EP3788722A4 (fr) 2018-06-13 2018-06-13 Annulation de brouillage inter-flux mimo (entrées multiples et sorties multiples)
CN201880094648.6A CN112997417A (zh) 2018-06-13 2018-06-13 Mimo(多输入多输出)流间干扰消除
PCT/US2018/037306 WO2019240790A1 (fr) 2018-06-13 2018-06-13 Annulation de brouillage inter-flux mimo (entrées multiples et sorties multiples)

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