Source: http://www.google.com/patents/US8121184?dq=7125605
Timestamp: 2017-06-26 12:56:43
Document Index: 157548305

Matched Legal Cases: ['§120', 'Application No. 2005', '§119', 'Application No. 06797294', 'Application No. 200802301', 'Application No. 200802302', 'Application No. 200802303']

Patent US8121184 - Wireless receiver - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA wireless receiver receiving a signal from a wireless transmitter which includes a plurality of transmission antennas and transmits data to which first phase rotation for controlling the maximum delay time between the plurality of transmission antennas is added and pilot channels corresponding to the...http://www.google.com/patents/US8121184?utm_source=gb-gplus-sharePatent US8121184 - Wireless receiverAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS8121184 B2Publication typeGrantApplication numberUS 12/326,581Publication dateFeb 21, 2012Filing dateDec 2, 2008Priority dateOct 31, 2005Fee statusPaidAlso published asCN101292441A, CN101292441B, CN101471690A, CN101471690B, CN101483464A, CN101483464B, CN101483465A, CN101483465B, DE602006020477D1, EP1944882A1, EP1944882A4, EP1944882B1, EP2034624A2, EP2034624A3, EP2034624B1, EP2034625A2, EP2034625A3, EP2034625B1, EP2037592A2, EP2037592A3, EP2037592B1, US8107897, US8111743, US8116708, US8121559, US8170512, US20090080402, US20090081967, US20090086838, US20100120388, US20100124888, US20100130221, US20110250855, WO2007052576A1Publication number12326581, 326581, US 8121184 B2, US 8121184B2, US-B2-8121184, US8121184 B2, US8121184B2InventorsKimihiko ImamuraOriginal AssigneeSharp Kabushiki KaishaExport CitationBiBTeX, EndNote, RefManPatent Citations (81), Non-Patent Citations (49), Referenced by (2), Classifications (26), Legal Events (6) External Links: USPTO, USPTO Assignment, EspacenetWireless receiver
US 8121184 B2Abstract
A wireless receiver receiving a signal from a wireless transmitter which includes a plurality of transmission antennas and transmits data to which first phase rotation for controlling the maximum delay time between the plurality of transmission antennas is added and pilot channels corresponding to the plurality of transmission antennas which are orthogonal to each other, where the wireless receiver includes a reception unit which receives the pilot channels and a demodulating unit which demodulates the data.
1. A wireless receiver for receiving a signal from a wireless transmitter which includes a plurality of transmission antennas and transmits data to which first phase rotation for controlling the maximum delay time between the plurality of transmission antennas is added and pilot channels corresponding to the plurality of transmission antennas which are orthogonal to each other, the wireless receiver comprising:
a reception unit which receives the pilot channels; and
a demodulating unit which demodulates the data taking a transfer function calculated from the pilot channels and the first phase rotation into consideration,
wherein a rotation amount of the first phase rotation is variable,
wherein the wireless receiver is used in a transmission system in which scheduling of users is performed on a per-chunk basis where a region defined in a frequency domain and in a time domain is divided into chunks in the frequency domain and in the time domain, and
2. The wireless receiver as recited in claim 1, wherein the first value is zero.
3. The wireless receiver as recited in claim 1, wherein the demodulating unit demodulates the data based on a signal obtained by averaging signals which are obtained from calculation of transfer functions and addition of the first phase rotation to the transfer functions for a plurality of allocated subcarriers.
This application is a Divisional of application Ser. No. 12/089,361 filed on Apr. 4, 2008, and for which priority is claimed under 35 U.S.C. §120; and this application claims priority of Application No. 2005-316549 filed in Japan on Oct. 31, 2005 under 35 U.S.C. §119.
The present invention relates to a wireless receiver
[Non-patent document 1] “Downlink Multiple Access Scheme for Evolved UTRA”, Apr. 4, 2005, R1-050249, 3GPP.
[Non-patent document 2] “Physical Channel and Multiplexing in Evolved UTRA Downlink”, Jun. 20, 2005, R1-050590, 3GPP.
The wireless receiver of the present invention receiving a signal from a wireless transmitter which includes a plurality of transmission antennas and transmits data to which first phase rotation for controlling the maximum delay time between the plurality of transmission antennas is added and pilot channels corresponding to the plurality of transmission antennas which are orthogonal to each other, where the wireless receiver includes: a reception unit which receives the pilot channels; and a demodulating unit which demodulates the data.
Moreover the wireless receiver of the present invention is in the aforementioned wireless receiver, the demodulating unit demodulates the data taking: a transfer function calculated from the pilot channels; and the first phase rotation into consideration.
Furthermore the wireless receiver of the present invention is in the aforementioned wireless receiver, a rotation amount of the first phase rotation is variable.
Moreover the wireless receiver of the present invention is in the aforementioned wireless receiver, where the wireless receiver is used in a transmission system in which scheduling of users is performed on a per-chunk basis where a region defined in a frequency domain and in a time domain is divided into chunks in the frequency domain and in the time domain, and in the case in which the frequency bandwidth of the chunk is Fc, the rotation amount is set so that the maximum delay time between the plurality of transmission antennas is set to either a predetermined first value which is smaller than 1/Fc or a predetermined second value which is larger than 1/Fc.
Furthermore the wireless receiver of the present invention is in the aforementioned wireless receiver, the first value is zero.
Moreover the wireless receiver of the present invention is in the aforementioned wireless receiver, the demodulating unit demodulates the data based on a signal obtained by averaging signals which are obtained from calculation of transfer functions and addition of the first phase rotation to the transfer functions for a plurality of allocated subcarriers.
The terminal apparatus of the present invention estimates channels with the base station antennas corresponding to respective pilot channels, and based on the result of applying a predetermined amount of phase rotation to the result of the channel estimation, selects a base station antenna where applying phase rotation improves the communication state, and calculates the phase rotation amount. Consequently, there is the advantage that a favorable multi-user diversity effect can be obtained.
Wireless transmitter; 2, 3, 4 Transmission antenna; 5, 6 Delay device; 7 Wireless receiver; 8 Wireless transmitter; 9, 10 Wireless receiver; 11 Reception antenna; 17 MAC unit; 18 Physical layer unit; 21 Transmission circuit unit; 22, 122 Reception circuit unit; 23 Wireless frequency converting unit; 24 Antenna unit; 33 A/D converting unit; 34 GI removing unit; 35 S/P converting unit; 36 FFT unit; 37 Pilot channel extracting unit; 38 Channel compensating unit; 39 Demodulating unit; 40 Error correction decoding unit; 41-1, 2, 3 Antenna-specific channel estimating unit; 42 Channel estimating unit; 43 Phase rotating unit; 44 Adding unit; 45 Switch unit; 46 Control unit; 47 Inversion antenna selecting unit; 48-1, 2, 3 Antenna-specific channel estimating unit; 49 Averaging unit; 50 Code multiplying unit; 51 Despreading unit; 65 PDCP unit; 66 RLC unit; 67 MAC unit; 68 Physical layer unit; 69 Scheduling unit; 70, 170 Transmission circuit controlling unit; 71 Transmission circuit unit; 72 Reception circuit unit; 73 Wireless frequency converting unit; 74, 75, 76 Antenna unit; 81 a, b User-specific signal processing unit; 82 Error correction encoding unit; 83 Modulating unit; 84 Subcarrier allocating unit; 85 Pilot channel inserting unit; 86 Phase rotating/weight multiplying unit; 87 IFFT unit; 88 Parallel/serial converting unit; 89 GI adding unit; 90 Filter unit; 91 D/A converting unit; 101-1, 2, 3 Antenna-specific signal processing unit; 102 Pilot signal generating unit; 103 Weight calculating unit; 147 Phase rotation amount calculating unit
A first embodiment of the present invention is described below with reference to the drawings. FIG. 1 is a block diagram showing the structure of a communication system in accordance with the present embodiment. FIG. 1 shows that signals transmitted by a wireless transmitter 1 travel through a plurality of channels and arrive at a wireless receiver 7. The wireless transmitter 1 has a plurality of transmission antennas 2 to 4, and signals are sent from the respective transmission antennas 2 to 4 with different delay times, 0, T, and 2T applied to the respective transmission antennas. The wireless receiver 7 receives the signals transmitted from the wireless transmitter 1. In FIG. 1, a case is described by way of example, in which the wireless transmitter 1 includes three transmission antennas 2 to 4. The plurality of transmission antennas mentioned here are, by way of example, the antennas installed in a wireless transmitter serving as a base station facility for cellular phones or the like, and can be any of three kinds of antenna namely; within the same sector, within the same base station but in different sectors, or in different base stations. Here as an example, a case in which the antennas are installed in the same sector is described, but other configurations may also be adopted. Furthermore, the delay time T is applied by delay devices 5 and 6 in the figure, that apply a delay time of T at transmission antenna 3, and a delay time of 2T at transmission antenna 4, as mentioned above.
FIG. 4A, FIG. 4B, FIG. 5A, and FIG. 5B are diagrams showing the relationship between the maximum delay time (n−1) T and frequency variation. As shown in FIG. 4A, when the difference between the arrival times of the two incoming waves w31 and w32 is (n−1) T, the transfer function of this channel is as shown in FIG. 4B. In other words, the interval between falls in the amplitude of the power (vertical axis) can be expressed as F=1/(n−1) T. Furthermore, as shown in FIG. 5A, when a plurality of delayed waves w41 to w42 exist, if the difference between the arrival times of the first incoming wave to arrive w41 and the last delayed wave to arrive w43 is (n−1)T, then as expected the frequency interval between falls in the amplitude of the power (vertical axis) is F=1/(n−1) T as shown in FIG. 5B.
Here, assuming a delay of T is added to the transmission antenna 3 and a delay of 2T is added to the transmission antenna 4, the phase rotation amount θ in FIG. 11 corresponds to the delay amount T, and can be expressed as θ=2πm′T/Ts. Here m′ is the subcarrier number of the middle subcarrier of the chunk used for communication between the transmitter 1 and the receiver 7 (for example chunk K1). Furthermore, Ts indicates the useful symbol duration of the OFDM symbol. Accordingly, because the value of θ can be calculated once the chunk used for communication and the delay time T for each transmission antenna are determined, by utilizing the properties of the orthogonal codes to calculate the transfer functions H1 to H3 between the transmission antennas 2 to 4 and the reception antenna 11, H1, H2 e jθ, and H3 e j2θ, which are the transfer functions after delay is added at each transmission antenna, and H1+H2 e jθ+H3 e j2θ, which is the transfer function after combining, can be calculated.
Thus, because the transfer functions H1, H2 e jθ, and H3 e j2θafter delay is added at each transmission antenna can be measured only at the terminal apparatus, and phase control such as “inverting the phase of the transmission antenna 4” can be performed only at the base station, information about whether or not phase inversion is required for each antenna number is provided from the terminal apparatus to the base station in the form of a binary signal as shown in FIG. 13.
3GPP contribution, R2-051738, “Evolution of Radio Interface Architecture”
3GPP contribution, R1-050248, “Uplink Multiple Access Scheme for Evolved UTRA”
Next, the reception circuit unit 22 is described with reference to FIG. 15. The reception circuit 22 includes: an A/D converting unit 33 that performs analog/digital conversion of the output of the wireless frequency converting unit 23 (FIG. 14); a GI removing unit 34 that removes a guard interval (GI) from the output of the A/D converting unit 33; an S/P converting unit 35 that performs serial/parallel conversion of the output of the GI removing unit 34; an FFT (Fast Fourier Transform) unit 36 that performs time/frequency conversion of the output of the S/P converting unit 35; a pilot channel extracting unit 37 that separates pilot channels from a data signal in the output of the FFT unit 36; antenna-specific channel estimating units 41-1 to 41-3 that use the pilot channels to derive the “transfer functions after delay is added at each transmission antenna” for the antennas numbered 1 to 3; an adding unit 44 that adds the outputs of the antenna-specific channel estimating units 41-1 to 41-3 for respective subcarriers; a switch unit 45 that switches between the output of the adding unit 44 and the output of a channel estimating unit 42 under the control of a control unit 46; a channel compensating unit 38 that applies channel compensation to a data signal using the output of the switch unit 45 as a channel estimation value; a demodulating unit 39 that performs demodulation processing such as QPSK (Quadrature Phase Shift Keying) or 16 QAM (Quadrature Amplitude Modulation) on the output of the channel compensating unit 38; and an error correction decoding unit 40 that performs error-correction decoding on the output of the demodulating unit 39.
Furthermore, the MAC unit 67 includes: a scheduling unit 69 that determines the allocated slots to use to communicate with each terminal communicating with the base station apparatus; and a transmission circuit controlling unit 70 that controls the transmission circuit unit 71 using “subcarrier allocation information” based on “chunk allocation information” received from the scheduling unit 69, and uses a phase control signal to control the delay time between the antennas depending on a frequency diversity region or multi-user diversity region, as shown in FIG. 2 and FIG. 3. In addition, in the MAC unit 67, the transmission circuit controlling unit 70 uses the antenna number notification signal, which is notified from the reception circuit 72 based on the received signal, to control the transmission circuit 71 through the phase control signal.
The user-specific signal processing unit 81 a includes an error correction encoding unit 82 that performs error-correction encoding of transmission data, and a modulating unit 83 that performs modulation processing such as QPSK or 16 QAM on the output of the error correction encoding unit. The outputs from the user-specific signal processing units 81 a and 81 b are allocated to suitable subcarriers in the subcarrier allocating unit 84 which allocates to suitable subcarriers based on the “subcarrier allocation information” notified from the transmission circuit controlling unit 70 (refer to FIG. 18), and are then output to the antenna-specific signal processing units 101-1 to 101-3. In the antenna-specific signal processing unit 101-1, the pilot channel inserting unit 85 allocates the output of the pilot channel generating unit 102 to the positions (subcarriers) for the common pilot channels as shown in FIG. 8, based on the outputs of the subcarrier allocating unit 84 and the output of the pilot channel generating unit 102.
Here, wm is the weight used by the weight multiplying circuit expressed as a vector, where the first element corresponds to the weight used for antenna number 1, the second element corresponds to the weight used for antenna number 2, and the nth element corresponds to the weight used for antenna number n, and so on. In the wm given above, n is the number of antennas (n=3 in the present embodiment), θ′ is the direction of the main beam, and k is the ratio between the frequency at which the signal is to be transmitted and the frequency at which θ′ was measured.
“IEICE Technical Report RCS2004-229”, published November 2004 by the Institute of Electronics, Information, and Communication Engineers
A different case in which the phase control information shown in FIG. 21 is used is described in the same manner. The phase control information in FIG. 21 is substantially the same as that in FIG. 20, with the exception of the phase control information related to the pilot channel of antenna number 3. In this case, the phase inversion operation is performed in the phase rotating/weight multiplying unit 86 on not only the data signal but also the pilot channel of the antenna whose antenna number is included in the antenna number notification signal notified from the terminal, and the use of such phase control information distinguishes FIG. 21 from FIG. 20. Furthermore, in this case, the phase rotation amount added in the phase rotating unit included in the antenna-specific channel estimating unit 41-3 on the terminal apparatus side in FIG. 15 also differs from FIG. 12, and because the state after phase rotation of n is added to the pilot channel is observed (H3′), only the phase rotation 20 corresponding to the delay time added to each antenna is added at the phase rotating unit 43 and used in the demodulation as channel estimation information (refer to FIG. 22).
In the present embodiment, a system is described in which the phase rotation amount for each antenna is measured in the terminal and is notified to the base station. FIG. 23 is substantially the same as FIG. 10, except that by adding the phase rotation amount required to align the phases at H1, that is, adding phase rotation amount of θ2 to the signal H2 e jθ from the antenna designated antenna number 2 (in this case transmission antenna 3) and phase rotation amount of θ3 to the signal H3 e j2θ from the antenna designated antenna number 3 (in this case transmission antenna 4), the received signals from the three transmission antennas can be added in an in-phase and received at the terminal.
This situation is shown in FIG. 24. That is, the transfer functions of respective antennas after delay is added are H1, H2 e jθ, and H3 e j2θ. Although the combined transfer function thereof is H1+H2 e jθ+H3 e j2θ, it can be understood that by adding phase rotation of θ2 to the antenna designated antenna number 2 (transmission antenna 3) and phase rotation of θ3 to the antenna designated antenna number 3 (transmission antenna 4) beforehand at the base station, the resulting transfer functions after phase rotation is performed and delay is added at respective antennas are H1, H2 e j(θ+θ2), and H3 e j(2θ+θ3), and the amplitude of the combined transfer function H1+H2 e j(θ+θ2)+H3 e j(2θ+θ3) thereof is larger than that of FIG. 23. Incidentally, applying the above case to FIG. 3B, a situation as in FIG. 11 where signals received from the respective transmission antennas weaken each other, leading to poor reception quality, corresponds to frequency channel b1 in FIG. 3B, and a situation as in FIG. 12 where signals received from the respective transmission antennas strengthen each other, leading to good reception quality, corresponds to frequency channel b2 of FIG. 3B.
The present invention is well suited to use in a communication system that performs multi-carrier transmission between a terminal apparatus and a base station apparatus and performs scheduling by dividing into multiple blocks in frequency and time domains, but is not limited to this.
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No. 12/547,238.* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS8483735 *Aug 26, 2010Jul 9, 2013Telefonaktiebolaget L M Ericsson (Publ)Methods and apparatus for parallel scheduling of frequency resources for communication nodesUS20120052894 *Aug 26, 2010Mar 1, 2012Telefonaktiebolaget Lm Ericsson (Pubi)Methods and apparatus for parallel scheduling of frequency resources for communication nodes* Cited by examinerClassifications U.S. Classification375/232, 455/132, 375/299, 375/267, 375/347, 455/101International ClassificationH04B7/02, H04B7/06, H04B7/12, H04J11/00, H03H7/30Cooperative ClassificationH04W88/08, H04W48/20, H04B7/0634, H04W24/00, H04B7/0671, H04B7/12, H04B7/0842, H04B7/0673, H04W48/16, H04B7/0682, H04W88/02European ClassificationH04W48/20, H04B7/06C5, H04B7/08C4, H04B7/06C2DLegal EventsDateCodeEventDescriptionOct 23, 2012CCCertificate of correctionJun 18, 2013ASAssignmentOwner name: HUAWEI TECHNOLOGIES CO., LTD., CHINAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SHARP CORPORATION;REEL/FRAME:030628/0698Effective date: 20130531Apr 23, 2015ASAssignmentOwner name: HUAWEI TECHNOLOGIES CO., LTD., CHINAFree format text: CORRECTIVE ASSIGNMENT TO CORRECT THE CONVEYING PARTY DATA NAME FROM "SHARP CORPORATION" TO "SHARP KABUSHIKI KAISHA" PREVIOUSLY RECORDED ON REEL 030628 FRAME 0698. 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