Source: http://www.google.com/patents/US7948960?dq=6,208,537
Timestamp: 2016-07-28 17:35:10
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Patent US7948960 - Radio transmission device - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsTo obtain maximum throughput in accordance with characteristics of a propagation path, a radio transmission device having a plurality of transmitting antennas (18 a, 18 b) for transmitting a transmission signal in units of sub-carriers by performing spatial multiplexing or without performing spatial...http://www.google.com/patents/US7948960?utm_source=gb-gplus-sharePatent US7948960 - Radio transmission deviceAdvanced Patent SearchPublication numberUS7948960 B2Publication typeGrantApplication numberUS 11/663,668PCT numberPCT/JP2005/017303Publication dateMay 24, 2011Filing dateSep 20, 2005Priority dateSep 27, 2004Fee statusPaidAlso published asCN101027863A, CN101027863B, CN102013909A, CN102013909B, CN102307057A, CN102307057B, EP1796300A1, EP1796300A4, EP2323305A2, EP2323305A3, EP2378699A2, EP2378699A3, US8416757, US8422478, US20070202818, US20110009079, US20110255503, WO2006035637A1Publication number11663668, 663668, PCT/2005/17303, PCT/JP/2005/017303, PCT/JP/2005/17303, PCT/JP/5/017303, PCT/JP/5/17303, PCT/JP2005/017303, PCT/JP2005/17303, PCT/JP2005017303, PCT/JP200517303, PCT/JP5/017303, PCT/JP5/17303, PCT/JP5017303, PCT/JP517303, US 7948960 B2, US 7948960B2, US-B2-7948960, US7948960 B2, US7948960B2InventorsNaoki OkamotoOriginal AssigneeSharp Kabushiki KaishaExport CitationBiBTeX, EndNote, RefManPatent Citations (33), Non-Patent Citations (2), Referenced by (10), Classifications (29), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetRadio transmission device
US 7948960 B2Abstract
a transmission control part that determines whether to perform spatial multiplexing for the sub-carriers based on information received from another radio communication device as a destination communication apparatus, and
when performing spatial multiplexing for each of said sub-carriers, said transmission control part determines a spatial multiplexing number for performing spatial multiplexing for each of said sub-carriers and outputs said determined spatial multiplexing number to said sub-carrier modulation part and said transmission signal allocation part,
when performing spatial multiplexing for sub-carriers grouped in block units where signal processing of said transmission signal is performed in said block units, said transmission control part determines a spatial multiplexing number for performing spatial multiplexing for each block unit of sub-carriers, wherein the same multiplexing number is assumed for each sub-carrier in a block unit, while
when not performing spatial multiplexing, said transmission control part outputs the same signal to said transmission allocation part, wherein
the radio transmitter transmits the signal by performing spatial multiplexing with the spatial multiplexing number selected for each of said sub-carriers, transmits a different signal by each block unit of sub-carriers by performing spatial multiplexing for each block unit with the spatial multiplexing number determined for each block unit, respectively, or transmits the same signal by each antenna.
2. The radio transmitter according to claim 1, wherein
said transmission signal is composed of a plurality of ordered symbols, and
said transmission signal allocation part allocates the symbols of said transmission signal, based on the spatial multiplexing number input from said transmission control part, for sub-carriers having said spatial multiplexing number of two or more, so that the symbols different from one another are transmitted by the antennas in the number corresponding to the number of said determined spatial multiplexing number, respectively.
8. The radio transmitter according to claim 1, wherein said transmission control part reduces, when any two or more of said transmitting antennas transmit an identical transmission signal, transmission power in each transmitting antenna transmitting said identical transmission signal.
9. A radio receiver having a plurality of receiving antennas for receiving a signal transmitted by the radio transmitter according to claim 1, wherein, when any two or more of said receiving antennas receive an identical signal, synthesis processing of the received signal is performed.
10. A radio transmission method using a plurality of transmitting antennas for transmitting a transmission signal in units of sub-carriers by performing spatial multiplexing or without performing spatial multiplexing, comprising at least the steps of:
determining whether to perform spatial multiplexing for the sub-carriers based on information received from another radio communication device as a destination communication apparatus, and
when performing spatial multiplexing for each sub-carrier, determining a spatial multiplexing number for performing spatial multiplexing for each of said sub-carriers,
when performing spatial multiplexing for sub-carriers grouped in block units, determining a spatial multiplexing number for performing spatial multiplexing for each block unit of sub-carriers, wherein the same multiplexing number is assumed for each sub-carrier in a block unit, while
when not performing spatial multiplexing, outputting the same signal;
allocating the transmission signal modulated for each of said sub-carriers to each of said transmitting antennas based on said determined spatial multiplexing number; and
transmitting the signal by performing spatial multiplexing with the spatial multiplexing number selected for each of said sub-carriers, transmitting a different signal by each block unit of sub-carriers by performing spatial multiplexing for each block unit with the spatial multiplexing number determined for each block unit, respectively, or transmitting the same signal by each antenna.
11. The radio transmission method according to claim 10, further comprising the step of determining said spatial multiplexing number for each spread unit when said transmission signal is spread on a frequency or time axis.
12. A radio communication device having m (m is a natural number of two or more) radio antennas conforming to a MIMO-OFDM-SDM (multi-input multi-output, orthogonal frequency division multiplexing, space division multiplexing) system, comprising:
maximum transmission throughput in accordance with characteristics of a propagation path is realized by adaptively changing said modulation multi-value number and said spatial multiplexing number. Description
The radio transmission device 100 can take three radio communication modes. The first one is spatial multiplexing, that is, as shown in FIG. 15, different information (transmission signal A≠transmission signal B) is transmitted from the two antennas 106 and 116 using the same frequency. The second one is frequency multiplexing, that is, as shown in FIG. 16, different information (transmission signal A≠transmission signal B) is transmitted from the two antennas 106 and 116 using different frequencies. The third one is spatial diversity, that is, as shown in FIG. 17, the same information (transmission signal A=transmission signal B) is transmitted from the two antennas 106 and 116 using the same frequency.
Since, when any two or more of the transmitting antennas transmit an identical transmission signal, transmission power of each transmitting antenna that transmits the identical transmission signal is reduced, an increase in power when the identical transmission signal is transmitted can be prevented so that appropriate transmission power is used for transmission. Incidentally, adoption of a technique equivalent to reduction in transmission power, for example, a technique for adjusting amplitudes may also be effective. Further, for sub-carriers transmitting identical signals, power of a signal transmitted by one of transmitting antennas is reduced to �, ⅓, and so on or power of any other transmitting antenna may be set to zero.
FIG. 1 is a block diagram showing an outline configuration of a radio transmission device according to a first embodiment. Encoding processing of a transmission signal is performed by an encoding part 10. Next, modulation of the transmission signal is performed for each sub-carrier by a sub-carrier modulation part 11. A control part 12 determines, based on information received from another radio communication device as an opposite party, the multiplexing number for performing spatial multiplexing for each sub-carrier using, for example, an error detection result and an interference detection result and outputs the determined multiplexing number to the sub-carrier modulation part 11 and a transmission signal allocation part 13. The transmission signal allocation part 13 transfers signals in the number corresponding to the number of sub-carriers to be processed by two IFFT parts 14 a and 14 b to the IFFT parts 14 a and 14 b. For example, if a system has 768 sub-carriers, 768 signals are transferred respectively. In slot assembly parts 15 a and 15 b, a guard time, a preamble part and the like are added to the signals that have been converted to time waveforms by the IFFT parts 14 a and 14 b to create a slot configuration to be transmitted. Next, the transmission signal is converted to RF frequencies by frequency conversion parts 16 a and 16 b based on frequencies generated by a carrier frequency generation part 17 to be transmitted from antennas 18 a and 18 b. Next, determination criteria whether to perform spatial multiplexing for each sub-carrier can be based on any information shown below:
(1) Antenna correlation of received signals for each sub-carrier. This is because interference increases when multiplexed in a high antenna correlation. (2) Received power. This is because it is better to decrease multiplicity when the received power is low. (3) Intensity of interference power for each sub-carrier. This is because propagation path estimation errors used for signal separation of MIMO increase when there are many interference waves. (4) It should be considered when a fixed number of sub-carriers are allocated to each user. This is because it is necessary to preferentially increase the multiplicity of a user if the information amount of the user must be increased at a certain time. An operation determining a spatial multiplexing number in units of sub-carriers based on any of the above determination criteria will be performed based on a flow chart shown in FIGS. 2 and 3. First, as shown in FIG. 2, propagation characteristic information necessary for determining whether or not to perform spatial multiplexing is measured (step S1). Next, when the propagation characteristic information, error characteristic information and the like are input into the control part 12 (step S2), the control part 12 determines a modulation multi-value number and the spatial multiplexing number (step S3). Then, the sub-carrier modulation part 11 performs multilevel modulation of a transmission signal (step S4). Then, signals of an antenna 1, an antenna 2, and so on for each sub-carrier are allocated to the transmission systems 1, 2, and so on (step S5) Here, if an identical signal is transmitted using another antenna, the signal is copied. Then, IFFT processing is performed by each transmission system to generate a transmission signal (step S6) Lastly, a MIMO signal is transmitted from two transmitting antennas (step S7) before completion.
Here, in order to allocate the signals, it is necessary to receive the number of signals to be multiplexed (multiplexing number) from the control part 12 and to notify the sub-carrier modulation part 11 and the transmission signal allocation part 13 of the number. If, for example, there are 768 sub-carriers in all and 300 sub-carriers transmit identical signals, symbols for which modulation processing is performed by the sub-carrier part are those for (768+768−300) signals. Then, identical modulation information will be used for sub-carriers that transmit identical signals when outputting to the IFFT parts 14 a and 14 b. Here, the multiplexing number “two” has been assumed for the description above, but the multiplexing number is not limited to “two” and if there are three transmission systems and the multiplexing number is three, the multiplexing number can be selected for each sub-carrier out of the multiplexing numbers one, two, and three.
(1) First Method The amount of transmission information is adjusted by fitting to a minimum delimiter of data to be transmitted.
The transmission signal allocation part 13 transfers signals in the number corresponding to the number of sub-carriers to be processed by two amplitude control parts 30 a and 30 b to the amplitude control parts 30 a and 30 b. For example, if a system has 768 sub-carriers, signals for the 768 sub-carriers will each be transferred. These amplitude control parts 30 a and 30 b adjust transmission power by adjusting amplitudes of the transmission signal. In the slot assembly parts 15 a and 15 b, a guard time, a preamble part and the like are added to the signals that have been converted to time waveforms by the IFFT parts 14 a and 14 b to create a slot configuration to be transmitted. Next, the transmission signal is converted to RF frequencies by the frequency conversion parts 16 a and 16 b based on frequencies generated by the carrier frequency generation part 17 to be transmitted from the antennas 18 a and 18 b. In the fifth embodiment, if there are two transmission systems and an identical signal is transmitted without multiplexing, twice as much power will be needed. Thus, the signal can be transmitted by adjusting the signal power to a level equivalent to that of a multiplexed signal. Therefore, it becomes possible to halve power from each of the transmission systems or eliminate power of one transmission system for sub-carriers transmitting an identical signal. Improvement can also be expected by performing the diversity reception, and power reduction from the improvement is also possible. Moreover, further improvement effects can be expected by controlling power on the transmitting side by the technique of transmission diversity.
Sub-carrier modulation part
Transmission signal allocation part
IFFT part
15a, 15b:
Slot assembly part
16a, 16b:
Frequency conversion part
Carrier frequency generation part
20a, 20b:
21a, 21b:
22a, 22b:
A/D conversion part
23a, 23b:
FFT part
Sub-carrier selection part
30a, 30b:
Amplitude control part
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IEEE VTS 54th, vol. 2, pp. 910-914, 2001.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS8416757 *Apr 9, 2013Sharp Kabushiki KaishaRadio transmission deviceUS8422478Apr 16, 2013Sharp Kabushiki KaishaRadio transmission deviceUS8654751 *Apr 26, 2012Feb 18, 2014Sharp Kabushiki KaishaRadio communication method, radio communication system, and radio transmission apparatusUS8681688Sep 12, 2008Mar 25, 2014Sharp Kabushiki KaishaRadio communication method, radio communication system, and radio transmission apparatusUS8699479 *Aug 18, 2008Apr 15, 2014Sk Telecom Co., Ltd.Server, system and method that providing additional contentsUS20100215080 *Sep 12, 2008Aug 26, 2010Sharp Kabushiki KaishaRadio communication method, radio communication system, and radio transmission apparatusUS20100278170 *Aug 18, 2008Nov 4, 2010Sk Telecom Co., Ltd.Server, system and method that providing additional contentsUS20110009079 *Jan 13, 2011Naoki OkamotoRadio transmission deviceUS20110255503 *Oct 20, 2011Naoki OkamotoRadio transmission deviceUS20120213054 *Apr 26, 2012Aug 23, 2012Yasuhiro HamaguchiRadio communication method, radio communication system, and radio transmission apparatus* Cited by examinerClassifications U.S. Classification370/343, 370/210, 370/208, 370/204, 370/205, 370/203, 455/73, 370/206International ClassificationH04L5/04, H04J99/00, H04J1/00, H04B1/38, H04J11/00, H04J9/00Cooperative ClassificationH04L5/0026, H04L5/0046, H04B7/0697, H04L5/0028, H04L5/0092, H04L5/0023, H04L5/0007, H04L1/0003, H04L5/006, H04L5/0039, H04L5/0016European ClassificationH04B7/06M, H04L5/00C7A, H04L5/00A9, H04L5/00E1Legal EventsDateCodeEventDescriptionMar 23, 2007ASAssignmentOwner name: SHARP KABUSHIKI KAISHA, JAPANFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:OKAMOTO, NAOKI;REEL/FRAME:019117/0001Effective date: 20070302Jun 18, 2013ASAssignmentOwner name: HUAWEI TECHNOLOGIES CO., LTD., CHINAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SHARP CORPORATION;REEL/FRAME:030628/0698Effective date: 20130531Oct 29, 2014FPAYFee paymentYear of fee payment: 4Apr 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. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT;ASSIGNOR:SHARP KABUSHIKI KAISHA;REEL/FRAME:035496/0281Effective date: 20150415Jul 16, 2015ASAssignmentOwner name: SNAPTRACK, INC., CALIFORNIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HUAWEI TECHNOLOGIES CO., LTD.;REEL/FRAME:036112/0627Effective date: 20150701RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services