Signal transmitting method (variants) and device for carrying out said method
First Claim
Patent Images
1. A method of data transmission, such that M diverse groups of transmission channels each having K transmission channels, where M≧
- 1, K≧
1, are formed at the base station, pilot signals are transmitted from the base station to the mobile station from all M·
K transmission channels of diverse groups, impulse responses of M·
K transmission channels of diverse groups are estimated at the mobile station using the transmitted pilot signals, which differs in that Lm sets of weighting coefficients of transmission direction each having K-1 weighting coefficients of transmission direction are formed at the mobile station using the estimated impulse responses of M·
K transmission channels of diverse groups, where 1≦
Lm≦
K and m=1, 2, . . . , M, for each of M diverse groups of transmission channels for each of Lm sets of weighting coefficients of transmission direction a transfer function of a channel of directional transmission corresponding to this set is estimated at the mobile station, a feedback signal containing Lm weighting coefficients of transmission direction formed for each of M diverse groups of transmission channels as well as an estimated transfer function for each of Lm weighting coefficients of transmission direction formed for each of M diverse groups of transmission channels is transmitted from the mobile station to the base station, Lm channels of directional transmission are formed at the base station for each of M diverse groups of transmission channels using the transmitted sets of weighting coefficients of transmission direction, channels of signal spectrum correction are formed at the base station for each of M diverse groups of transmission channels for each of Lm channels of directional transmission and their transfer functions are corrected according to the transmitted estimated transfer functions of channels of directional transmission in such a way that the reception quality of an information signal at the mobile station is maximized, information signal copies are formed at the base station for all Lm channels of directional transmission for all M diverse groups of transmission channels and all formed copies of the information signal are simultaneously transmitted over the corresponding channels of directional transmission after applying them to the respective channels of signal spectrum correction.
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Abstract
A group of inventions relate generally to radio engineering, and more particularly to a method of data transmission (embodiments) and apparatus of data transmission (embodiments) to be used, for example, in cellular communications systems when transmitting an information signal over the downlink from base station to mobile station. The goal of the present method of data transmission (embodiments) and the apparatus of data transmission (embodiments) is to increase the efficiency of the information signal transmission in the downlink and, thus, maximize the information signal reception quality at the mobile station. The claimed solution also reduces the feedback channel (from mobile to base station) load. The object of the invention is attained by correcting the spectrum of the transmitted information signal copies, transmitting the information signal copies from each adaptive antenna array in each efficient transmission direction, estimating the transfer functions of the directional transmission channels using the pilot signals transmitted from each antenna element, pilot signals for transmit diversity, transmitted from each adaptive antenna array in each efficient transmission direction, combining these two estimates, and by estimating the efficient transmission directions at the base station using the mobile station signal.
21 Citations
22 Claims
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1. A method of data transmission, such that M diverse groups of transmission channels each having K transmission channels, where M≧
- 1, K≧
1, are formed at the base station, pilot signals are transmitted from the base station to the mobile station from all M·
K transmission channels of diverse groups, impulse responses of M·
K transmission channels of diverse groups are estimated at the mobile station using the transmitted pilot signals, which differs in that Lm sets of weighting coefficients of transmission direction each having K-1 weighting coefficients of transmission direction are formed at the mobile station using the estimated impulse responses of M·
K transmission channels of diverse groups, where 1≦
Lm≦
K and m=1, 2, . . . , M, for each of M diverse groups of transmission channels for each of Lm sets of weighting coefficients of transmission direction a transfer function of a channel of directional transmission corresponding to this set is estimated at the mobile station, a feedback signal containing Lm weighting coefficients of transmission direction formed for each of M diverse groups of transmission channels as well as an estimated transfer function for each of Lm weighting coefficients of transmission direction formed for each of M diverse groups of transmission channels is transmitted from the mobile station to the base station, Lm channels of directional transmission are formed at the base station for each of M diverse groups of transmission channels using the transmitted sets of weighting coefficients of transmission direction, channels of signal spectrum correction are formed at the base station for each of M diverse groups of transmission channels for each of Lm channels of directional transmission and their transfer functions are corrected according to the transmitted estimated transfer functions of channels of directional transmission in such a way that the reception quality of an information signal at the mobile station is maximized, information signal copies are formed at the base station for all Lm channels of directional transmission for all M diverse groups of transmission channels and all formed copies of the information signal are simultaneously transmitted over the corresponding channels of directional transmission after applying them to the respective channels of signal spectrum correction. - View Dependent Claims (2, 3, 6, 7, 8, 9, 10, 13, 14, 15, 16, 17, 18, 22)
- 1, K≧
-
4. The method of data transmission, such that M diverse groups of transmission channels each having K transmission channels are formed at the base station, where M≧
- 1, K≧
1, pilot signals are transmitted from the base station to the mobile station from all M·
K transmission channels of diverse groups,impulse responses of M·
K transmission channels of diverse groups are estimated at the mobile station using the transmitted pilot signals, which differs in that Lm sets of weighting coefficients of transmission direction each having K-1 weighting coefficients of transmission direction are formed at the mobile station for each of M diverse groups of transmission channels using the estimated impulse responses of M·
K transmission channels of diverse groups, where 1≦
Lm≦
K and m=1, 2, . . . , M, a feedback signal containing Lm formed sets of weighting coefficients of transmission direction for each of M diverse groups of transmission channels is transmitted from the mobile station to the base station, Lm channels of directional transmission are formed at the base station at each of M diverse groups of transmission channels using transmitted sets of weighting coefficients of transmission direction, pilot signals for transmit diversity are transmitted form the base station to the mobile station from each of M diverse groups of transmission channels over each of Lm channels of directional transmission, transfer functions of each of Lm channels of directional transmission are estimated at the mobile station for each of M diverse groups of transmission channels using the transmitted pilot signals for transmit diversity, a feedback signal containing Lm estimated transfer functions of channels of direction transmission for each of M diverse groups of transmission channels is transmitted from the mobile station to the base station, channels of signal spectrum correction are formed at the base station for each of M diverse groups of transmission channels for each of Lm channels of directional transmission and their transfer functions are corrected according to transmitted estimated transfer functions of channels of directional transmission in such a way that the reception quality of the information signal at the mobile station is maximized, information signal copies are formed at the base station for all Lm channels of directional transmission for all M diverse groups of transmission channels and all formed copies of the information signal are simultaneously transmitted over the corresponding channels of directional transmission after applying them to the respective channels of signal spectrum correction. - View Dependent Claims (11)
- 1, K≧
-
5. The method of data transmission, such that M diverse groups of transmission channels each having K transmission channels are formed at the base station, where M≧
- 1, K≧
1, pilot signals are transmitted from the base station to the mobile station from all M·
K transmission channels of diverse groups,impulse responses of M·
K transmission channels of diverse groups are estimated at the mobile station using the transmitted pilot signals, which differs in that Lm sets of weighting coefficients of transmission direction each having K-1 weighting coefficients of transmission direction are formed at the mobile station for each of M diverse groups of transmission channels using the estimated impulse responses of M·
K transmission channels of diverse groups, where 1≦
Lm≦
K and m=1, 2, . . . , M, transfer functions of channels of directional transmission corresponding to each of Lm sets of weighting coefficients of transmission direction of all M diverse groups of transmission channels are estimated at the mobile station, a feedback signal containing Lm formed sets of weighting coefficients of transmission direction for each of M diverse groups of transmission channels is transmitted from the mobile station to the base station, Lm channels of directional transmission are formed at the base station at each of M diverse groups of transmission channels using the transmitted sets of weighting coefficients of transmission direction, pilot signals for transmit diversity are transmitted from the base station to the mobile station from each of M diverse groups of transmission channels over each of Lm channels of directional transmission, transfer functions of Lm channels of directional transmission for each of M diverse groups of transmission channels are estimated at the mobile station using the transmitted pilot signals for transmit diversity, for each of M diverse groups of transmission channels an estimate of transfer function of each of Lm channels of directional transmission, obtained using K pilot signals transmitted from this diverse group of transmission channels, is combined with an estimate of its transfer function, obtained using a pilot signal for transmit diversity transmitted from this diverse group of transmission channels, a feedback signal containing Lm estimated transfer functions of channels of directional transmission for each of M diverse groups of transmission channels is transmitted from the mobile station to the base station, channels of signal spectrum correction are formed at the base station for each of M diverse groups of transmission channels for each of Lm channels of directional transmission and their transfer functions are corrected according to the transmitted estimated transfer functions of channels of directional transmission in such a way that the reception quality of the information signal at the mobile station is maximized, information signal copies are formed at the base station for all Lm channels of directional transmission for all M diverse groups of transmission channels and all formed information signal copies are simultaneously transmitted over the corresponding channels of directional transmission after applying them to the respective channels of signal spectrum correction.
- 1, K≧
-
12. The method of data transmission, such that
M diverse groups of transmission channels each having K transmission channels are formed at the base station, where M≧ - 1, K≧
1, which differs in thatM diverse groups of receiving channels each having K receiving channels corresponding to M formed diverse groups of transmission channels are formed at the base station, a signal is transmitted from the mobile station to the base station and received at the base station in each of K receiving channels of each of M diverse groups, Lm sets of weighting coefficients of transmission direction each having K coefficients are formed for each of M diverse groups of transmission channels using a signal received from the mobile station in such a way that the reception quality of the base station signal received at the mobile station is maximized, where Lm≧
0 and m=1, 2, . . . , M, Lm channels of directional transmission are formed at each of M diverse groups of transmission channels using formed sets of weighting coefficients of transmission direction, pilot signals for transmit diversity are transmitted to the mobile station from each of M diverse groups of transmission channels over each of Lm channels of directional transmission, transfer functions of all Lm channels of directional transmission are estimated at the mobile station for each of M diverse groups of transmission channels using the transmitted pilot signals for transmit diversity,a feedback signal containing Lm estimated transfer functions of directional transmission channels for each of M diverse groups of transmission channels is transmitted to the base station, channels of signal spectrum correction are formed at the base station for each of M diverse groups of transmission channels for each of Lm channels of directional transmission and their transfer functions are corrected according to the transmitted estimated transfer functions of directional transmission channels in such a way that the reception quality of the information signal at the mobile station is maximized, information signal copies are formed for all Lm channels of directional transmission for all M diverse groups of transmission channels and all formed copies of the information signal are simultaneously transmitted over the corresponding channels of directional transmission after applying them to the respective channels of signal spectrum correction.
- 1, K≧
-
19. The apparatus for data transmission that includes M blocks of directional transmission, M·
- K summation blocks, M·
K analog transmitters, M·
K antenna elements, such that the second inputs of each of M blocks of directional transmission are inputs of the corresponding weighting coefficients of transmission direction, each of K outputs of each of M blocks of directional transmission is connected to the second input of the corresponding block of summation, the first input of each of M·
K blocks of summation is an input of the corresponding pilot signal, outputs of blocks of summation are connected to inputs of the corresponding analog transmitters, their outputs are connected to inputs of the corresponding antenna elements, their outputs are outputs of the apparatus for data transmission, which differs in that another
- K summation blocks, M·
-
20. The apparatus for data transmission that includes M blocks of directional transmission, M·
- K blocks of summation, M·
K analog transmitters, M·
K antenna elements, such that the second inputs of each of M blocks of directional transmission are inputs of the corresponding weighting coefficients of transmission direction, each of K outputs of each of M blocks of directional transmission is connected to the second input of the corresponding block of summation, the first input of each of M·
K blocks of summation is an input of the corresponding pilot signal, outputs of blocks of summation are connected to inputs of the corresponding analog transmitters, the outputs of which are connected to the inputs of the corresponding antenna elements, whose outputs are outputs of the apparatus for data transmission, which differs in that
- K blocks of summation, M·
-
21. The apparatus for data transmission that includes M blocks of directional transmission, M·
- K blocks of summation, M·
K analog transmitters, M·
K antenna elements, such that outputs of each of M blocks of directional transmission are connected to inputs of the corresponding blocks of summation, an output of each of M·
K blocks of summation is connected to an input of the corresponding analog transmitter, an output of each of M·
K analog transmitters is connected to the first input of the corresponding antenna element, the first output of each of M·
K antenna elements is an output of the apparatus for data transmission, which differs in that
- K blocks of summation, M·
Specification
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Current AssigneeJsc "Kodofon"
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Original AssigneeAvage Inc.
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InventorsFilin, Stanislav, Garmonov, Alexandr, Savinkov, Andrew
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Granted Patent
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Time in Patent OfficeDays
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Field of Search
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US Class Current370/204
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CPC Class CodesH04B 1/7097 Interference-related aspectsH04B 2201/709709 Methods of preventing inter...H04B 7/0626 Channel coefficients, e.g. ...H04B 7/0658 Feedback reduction
