WO2003069832A1 - Method for beamforming a multi-use receiver with channel estimation - Google Patents

Method for beamforming a multi-use receiver with channel estimation Download PDF

Info

Publication number
WO2003069832A1
WO2003069832A1 PCT/EP2003/001043 EP0301043W WO03069832A1 WO 2003069832 A1 WO2003069832 A1 WO 2003069832A1 EP 0301043 W EP0301043 W EP 0301043W WO 03069832 A1 WO03069832 A1 WO 03069832A1
Authority
WO
WIPO (PCT)
Prior art keywords
method
antenna
ka
channel estimation
signals
Prior art date
Application number
PCT/EP2003/001043
Other languages
German (de)
French (fr)
Inventor
Mario Kiessling
Ingo Viering
Markus Reinhardt
Thomas Frey
Original Assignee
Siemens Aktiengesellschaft
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
Priority to EP02003321.3 priority Critical
Priority to EP20020003321 priority patent/EP1337064A1/en
Priority to DE2002105910 priority patent/DE10205910A1/en
Priority to DE10205910.1 priority
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Publication of WO2003069832A1 publication Critical patent/WO2003069832A1/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837Diversity 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
    • H04B7/0842Weighted combining
    • H04B7/0845Weighted combining per branch equalization, e.g. by an FIR-filter or RAKE receiver per antenna branch
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837Diversity 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
    • H04B7/0842Weighted combining
    • H04B7/086Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837Diversity 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
    • H04B7/0842Weighted combining
    • H04B7/0848Joint weighting
    • H04B7/0851Joint weighting using training sequences or error signal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; Arrangements for supplying electrical power along data transmission lines
    • H04L25/0202Channel estimation

Abstract

The invention relates to a beamforming method for a multi-use receiver with an array of antennas. A covariance matrix and the eigenvalues thereof are determined following a channel estimation, from which antenna weights (AGEW) are calculated by means of a selection (AUS). A beamforming signal (BFS) is then obtained from the antenna weights and the channel estimations. Corrected channel estimations, which are used in a maximum ratio combining method, a zero forcing method, or a joint detection method (JDET) for estimating data, are then determined in a transformation stage (T). UTRA-TDD and UTRA-FDD transmission systems are examples of applications of the inventive method.

Description

WAY TO A beamforming MEHRNUTZEMPFÄNGERS WITH CHANNEL ESTIMATE

description

A process for the formation of a current supplied to a channel decoding scalar decision signal which is obtained by means of a channel estimation and a beam forming method of antenna signals of a radio communication system.

The invention relates to a method according to the features of the first claim.

In radio communication systems with multiple users is multi-element antennas antenna system in combination with a so-called multi-antenna receiver is used to improve reception. Antenna signals of the individual antennas in the multiple antenna receiver are passed via the individual antennas.

Through the use of several individual antennas, or by the resulting coherence gain within the Mehran- receiver antennas, it is possible to lower signal -

Störabstande allow for the antenna signals to be systemic predetermined quality requirements. However, these antenna signals are only suitable to be carried out on a Kanalschätzungs- process or be carried out on a beamforming method, since the disturbed by noise antenna signals cause inaccurate results in both methods.

In known multi-antenna receivers, the beamforming method in the so-called signal path is arranged on the high

prevailing data rates, while the channel estimation is carried out in a channel estimation path. Both output signals of channel estimation and path of the signal path to be used to form a scalar decision signal which is supplied to a Kanaldeco- dation or a bit decision and define operation for the multi-antenna receiver.

Such a structure is for example realized also in so-called single-antenna receiver, which, however, operated within a radio communication system generally consists of hardware and software specific reasons not to a multi-antenna receiver may readily extended advertising the.

The object of the present invention is to design a receiver structure to form a scalar decision signal such that the receiver structure so-well in a multi-antenna receiver and a single antenna receiver is used and the single antenna receiver to subsequently with little effort can be expanded to a multi-antenna receiver.

The object of the invention is solved by the features of claim 1. Advantageous developments of the invention are specified in the subclaims.

The inventive displacement of the beamforming process in the channel estimation path, prevailing in the lower data rates, a subsequent extension of a single antenna receiver is enabled to a multi-antenna receiver in a simple manner, because:

- the functions of the channel estimation path are implemented using digital components and are therefore always easily readjusted and expanded, and - is enlarged, only the hardware of the signal path is adjusted accordingly to the formation of the decision signal.

The time required for the beam-forming method of computing time is also reduced because the channel estimation path, compared with the signal path, lower data rates to be processed.

Comparing to the prior art, are performed on the generally two pilot correlations and two channel estimates, in the inventive method, only one channel estimation or only a pilot correlation for the formation of the decision signal is necessary.

By the inventive method, the inaccurate due to noise channel estimates based on the individual antenna signals are improved, and it Langzei - properties of the channel used to advantage in the channel estimation.

In the following, an embodiment of the invention is explained in more detail with reference to a drawing. In which:

1 shows a basic circuit diagram of a method for forming a scalar decision signal ENTS in a multi-antenna receiver, according to the prior art,

2 shows a basic circuit diagram of a further process for formation of a scalar decision signal ENTS in a multi-antenna receiver, according to the state of the art,

3 shows a basic circuit diagram of an inventive method for forming a scalar decision signal ENTS in a multi-antenna receiver, FIG 4 comparing to FIG 3, a first embodiment of the inventive method for forming a scalar decision signal ENTS in a multi-antenna receiver, and FIG 5 comparing to FIG 3 shows a second embodiment of the inventive method for forming a scalar decision signal ENTS in a multi-antenna receiver.

1 shows a basic circuit diagram of a method for forming a scalar decision signal ENTS in a multi-antenna receiver, according to the prior art.

It received antenna arrangement Ka antenna signals from Ka individual antennas of arrival. These enter one hand via a pilot correlator Pikor and a subsequently arranged NV post and on the other hand, directly to a device ENT, by means of which the decision signal ENTS is formed. The decision signal ENTS is thereby formed for each user of the radio communication system and is thus both channel-specific and user-specific.

With the pilot correlator Pikor and with the post-NV channel estimation KS is performed with the aid nalimpulsantworten Ka hK are determined as channel-specific parameter.

In the post-NV disturbing noise components are removed, for example in the output signals of the Pilotkorrelators Pikor the basis of a threshold decision.

For the formation of the decision signal ENTS the Ka antenna signals using the channel impulse responses hK be combined or adaptively filtered. This is realized, for example, depending on the configuration of the radio communication system by a "maximum ratio combining" process, "Joint - Detection" method, the use of a "Vienna" filter or a "zero-forcing" method. Here, a com- mon detection of multiple users is made possible both in space, time and in user direction.

Such methods are preferably used for TDD radio communication systems, whereas the use with FDD radio communication systems can be realized only with great computational effort.

When using a multi-element antennas antenna arrangement by the systemic arrival antenna gain lower signal -Störabstände on the received Ka antenna signals tolerable, however, the performed channel estimation KS and the formation of the decision signal ENTS be disturbed by the generally very noisy Ka antenna signals disadvantageous and thus inaccurate.

2 shows a basic circuit diagram of a further process for formation of a scalar decision signal ENTS in a multi-antenna receiver, according to the prior art.

Comparing to FIG 1 uses this multi-antenna receiver

Long-term characteristics of a channel. It reach Ka antenna signals from Ka individual antennas of an antenna array as input signals to both a channel estimation path KS and to a signal path S.

The inputs to the channel estimation path KS reach a first pilot correlator PIKOR1 with the aid Antennenim- hA impulse responses are calculated. user-specific antenna weights Agew be calculated using an antenna weight calculation Conditions from the Antennenimpulsant- words hA. With the aid of the first Pilotkorrelators PIK0R1 and the antenna weight calculation Conditions a first channel estimation KS1 is performed.

The input signals of the signal path S move are calculated together with the calculated antenna weights to a Agew arranged in the signal path S beamformer WH, with the aid of beam signals rB. The Beam signals rB reach one hand, as output signals SA of the signal path S to a device ENT1, by means of which the decision signal ENTS is formed, and on the other hand to a second pilot correlator PIKOR2. Output signals of the second Pilotkorrelators PIKOR2 reach a postprocessing Beam NV as hB pulse signals as output signals KSA the channel estimation path KS also to the device ENT1. With the aid of the second Pilotkorrelators PIKOR2 and the post-NV a second channel estimation is carried out KS2.

Comparing with FIG 1, two channel estimates KS1 and KS2 are performed, wherein the known structure of Figure 1 in the arrangement of the first Pilotkorrelators PIKOR1, the post-processing of the beamformer NV and WH can be seen.

Using the first channel estimation KS1 fast fading characteristics of the channels are averaged and taken advantage of long-term properties of the channels. The beam signals r B are characterized by a higher signal -Störabstand. In the education fertil the decision signal ENTS short-term characteristics of the channel are considered. Possible methods for antenna weight calculation method Conditions such as self-beamforming, fixed beamforming, hybrid beamforming and direction-based methods are known. The ante nominal weights Agew can be determined precisely to the individual antenna elements despite strong comparable rauschter channel estimate and make clear one or more antenna beams is.

The formation of the decision signal ENTS done beispiels- example again using a maximum ratio Combining-

Method or a joint detection similar procedure, such as the partial joint detection method.

In this multi-antenna receiver may be mentioned as a disadvantage that the spatial signal processing is largely separated from the remaining signal processing.

At the joint detection method, are processed together in the space, time and user, such a receiver structure is generally not applicable. The beamforming WH takes place here in the signal path, exist along the typically high data rates, which increased processing times and problems with the hardware or software implementation caused.

3 shows a basic circuit diagram of an inventive method for forming a scalar decision signal ENTS in a multi-antenna receiver.

It reach Ka antenna signals from Ka individual antennas of an antenna array as input signals on the one hand to a channel estimation path KSP and on the other to a signal path SP. The inputs to the channel estimation path KSP are supplied to a pilot correlator Pikor with the aid of a channel estimation KS is performed, and user-specific antennas nenimpulsantworten hA are formed. With the help of user-specific antenna impulse response hA an antenna weight calculation Conditions will be performed to determine Ante nominal weights Agew.

With the aid of the calculated antenna weights and the antenna Agew impulse responses ha WH beamforming is performed, whose output signals are supplied as Beamformingsignale BFS egg ner post NV. Using the post-NV Beam impulse responses h B are formed which reach a transformer T.

The transformer T is used for the inverse transformation of the Beamim- impulse responses hB in the antenna region and forms, with the help of the beam pulse signals hB and the calculated antenna weights Agew corrected user-specific impulse responses hA 'which are reproduced as output signals KSPS the channel estimation path KSP the antenna impulse responses hA.

Both the Ka antenna signals of the signal path and the corrected impulse response hA "are supplied to a device ENT to the formation of the decision signal ENTS. The formation of the decision signal ENTS effected with the aid of adaptive filter Kombinierungsfunktionen, depending on the configuration of the radio communication system, for example by a" Maximum-Ratio -Combining "method," joint -Detection "- process, the use of a" Vienna "filter or a" zero-forcing "method.

Comparing to FIG 2, the beamforming WH has been displaced from the signal path SP in the channel estimation deposit KSP, wherein only a pilot correlation Pikor is performed in the inventive method.

Since lower data rates occur within the channel estimation path KSP comparison to Sig- nalpfad SP, such a multi-antenna receiver is easy to implement and expand.

According to the calculated antenna weights Agew and the transformation T are each on the total antenna impulse responses hA, so on every single value applied.

Alternatively, the following enhancements are helping the antenna weight calculation Conditions possible: a.) For each value of the antenna impulse response hA own set of antenna weighting factors Agew and a transformation T is calculated, which are then each applied only to the value. b.) The values ​​of the antenna impulse responses are grouped and, for each group a set of antenna weights and a transformation T is calculated which are then respectively applied to any value of this group.

According to the invention as linear structures "decision feedback" or "Interference Cancellation" etc. may be used instead of the linear adaptive filter Kombinierungsfunktionen in the formation of the decision signal in principle not. These are generally multi-stage, and are also improved by the inventive method by the channel estimation path of each stage is extended in accordance with the described structure. 4 shows comparison to FIG 3, a first exemplary embodiment of the game method of the invention to form a scalar decision signal ENTS in a multi-antenna receiver. Here, a UTRA FDD radio communication system is assumed.

The Ka antenna signals are applied to a delay Seacher DELS, with the aid of pilot correlator DESP of the channel estimation path KSP despread user-specific DPCCH channels and antennas nenimpulsantworten hA generated, which are used on the one hand to the antenna weight calculation Conditions and on the other hand to the beamforming WH. Each individual user-specific antenna impulse response includes Kt * Ka antenna coefficients, where Kt using the delay Searchers DELS is dependent on position determined by energy giemaxima.

The antenna weight calculation Conditions done with the help of covariance matrix estimates COV, eigenvalue decompositions EVD and a selection OFF. The calculated weights Antennenge- Agew be connected to the antenna impulse response hA the

Beamformer WH supplied whose output signals are supplied as Beamfor- mingsignale BFS an unnecessary here postprocessing Beam NV as impulse responses hB the transformer T. The corrected formed with the aid of the transformer T

Impulse responses hA 'access to the means for forming the decision signal ENT ENTS, which is here formed with the help of a maximum ratio combiner MRC.

When the input signals of the signal path SP user-specific DPDCH channels are despread (DESP) and Kt * Ka antennas delay signals calculated, which are used together with the corrected impulse responses hA 'for the formation of the decision signal ENTS using the delay Searchers DELS.

5 shows comparison to FIG 3, a second exemplary embodiment of the game method of the invention to form a scalar decision signal ENTS in a multi-antenna receiver. Here, a UTRA TDD radio communication system is provided.

The pilot correlation Pikor takes place here by means of a

Midambelkorrelation Midco. The antenna weight calculation GTC is again using covariance matrix estimates COV, eigenvalue decompositions EVD and a selection OFF. With the help of the selection process AUS only ma xi ale benefits of users, for example, pursued.

The post-processing NV forms a threshold decision SCH, while the formation of the decision signal ENTS carried out by means of a joint -Detectors JDET.

total Ku Ka * arrival are antenna impulse responses hA determined on each of the Ka antenna signals for each of Ku users by Midamblekorrelation, for then individual for each user a covariance matrix is ​​estimated. A suitable subset of eigenvalues ​​of each covariance matrix is ​​first applied as a transformation to the corresponding impulse response.

then, the threshold decision SCH sets small values ​​of the impulse response, which represent only noise components usually to zero. With the help of the transformation T eventually greatly improved channel estimate is sufficient ER. The Joint Detector JDET itself is conventional, but operate with less noisy impulse responses.

Claims

claims
1. A method for forming a channel decoding supplied scalar decision signal (ENTS), the (WH) is recovered from Ka antenna signals of a radio communication system using a channel estimation (KS), and by means of a Beamfor- ming process,
- in which the Ka antenna signals from Ka individual antennas as input signals to both a channel estimation path (KSP) and a parallel thereto signal path (SP) to
Forming a respective output signal (KSPS, SPS) arrive,
- wherein in the channel estimation path (KSP) to form the output signal (KSPS) first channel estimation on the Ka antenna signals (KS) and subsequently the beamforming method (WH) is carried out, and
- in which from the output signals (KSPS, PLC) of the signal - path (SP) and the channel estimation path (KSP) the scalar decision signal (ENTS) is formed.
2. The method of claim 1, wherein the scalar decision signal (ENTS) by means of an adaptive filter combining function is formed.
3. The method of claim 1 or 2, wherein in the channel estimation path (KSP) with the aid of a pilot correlation method (Pikor) from the Ka antenna signals user-specific check-antenna impulse responses (HA) are formed, on the one hand to calculate user-specific antenna weights (Agew) and the other part performing the beamforming process (WH) may be used.
4. The method of claim 3, wherein the calculated antenna weights (Agew) on the one hand to carry out the Beam Forming method (WH) used and on the other hand, a transformation (T) are subjected.
5. The method of claim 3 or 4, user-specific in which by means of the beam-forming method (WH) beamforming signals (BFS) are formed by a post-processing (NV) as the Beam impulse responses (h B) of the transformer tion (T) fed become.
6. The method of claim 4 or 5, wherein by means of the transformation (T) of the beam pulse responses (h B) and from the calculated antenna weights (Agew) nutzerspezi- fish, the antenna impulse responses (hA) simulated, corrected impulse responses (hA ') as output signals (KSPS) of the channel estimation path (KSP) are generated.
7. The method according to any one of the preceding claims, wherein for Ku user the user-specific antenna weights
(Agew) with the aid of the covariance matrix estimates (COV), eigenvalue decompositions (EVD) and a selection (AUS) can be determined.
8. The method according to any one of the preceding claims, characterized by use in a UTRA-TDD radio communication system.
9. The method of claim 8, wherein as Pilotkorrelations- (Pikor) method, a midamble correlation (Midco) for
Formation of Ku * Ka antenna impulse responses (hA) of Ku users is used.
10. The method of claim 8 or 9, wherein the post-processing (NV) of the Beamformingsignale (BFS) with the aid of a threshold decision (SCH) is performed.
11. The method according to any one of claims 8 to 10, wherein in the formation of the decision signal (ENTS) as an adaptive filter combining function a Joint Detection method (JDET) is used, where Ku * Ka corrected impulse responses (hA ') on the one hand and ka antenna signals other, form the output signals (KSPS, PLC) of the channel estimation path (KSP) on the one hand and the signal path (SP) on the other.
12. The method according to claim 7, characterized by the appropriation in a UTRA-FDD radio communication system.
13. The method of claim 12, wherein the pilot correlation process with the aid of a delay Searchers (DELS) to which the Ka antenna signals are supplied to despread the users conces- arranged DPCCH channels and Kt * Ka coefficient Kt Delays of the delay Searchers as are formed antenna impulse responses (hA).
14. The method of claim 12 or 13, wherein the renegotiations processing (NV) of the Beamformingsignale (BFS) is performed such that this beam as impulse responses (h B) (T) go to the transformation.
15. The method according to any one of claims 12 to 14, wherein in the formation of the decision signal (ENTS) as adaptive
Filter-combining function, a maximum ratio Combining- method (MRC) is used.
16. The method according to any one of claims 13 to 15, wherein in the signal path (SP) by means of the delay Searchers (DELS) despread user-specific DPDCH channels from the input signals of the signal path and Kt * Ka antennas delay signals are calculated, with the corrected impulse responses (hA ') for the formation of the decision signal (ENTS) may be used.
17. The method according to any one of the preceding claims, wherein the calculation of the antenna weights (Agew) is effected by means of a fixed beamforming method or a Eigenbeam- forming method or a combination thereof.
PCT/EP2003/001043 2002-02-13 2003-02-03 Method for beamforming a multi-use receiver with channel estimation WO2003069832A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP02003321.3 2002-02-13
EP20020003321 EP1337064A1 (en) 2002-02-13 2002-02-13 Beamforming method for a multiuser receiver with channel estimation
DE2002105910 DE10205910A1 (en) 2002-02-13 2002-02-13 Scalar decision signal formation method for multiple antenna receiver uses channel estimation and beam forming method
DE10205910.1 2002-02-13

Publications (1)

Publication Number Publication Date
WO2003069832A1 true WO2003069832A1 (en) 2003-08-21

Family

ID=27735667

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2003/001043 WO2003069832A1 (en) 2002-02-13 2003-02-03 Method for beamforming a multi-use receiver with channel estimation

Country Status (1)

Country Link
WO (1) WO2003069832A1 (en)

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100544230C (en) 2005-08-18 2009-09-23 中兴通讯股份有限公司 Method for estimating angle of arrival wave and method assigning form for wave packet
CN102026387A (en) * 2010-12-20 2011-04-20 中兴通讯股份有限公司 BF (beam forming) control method and device
CN101072066B (en) 2006-05-08 2011-05-11 中兴通讯股份有限公司 Intelligent antenna realizing method for CDMA communication system
US8045512B2 (en) 2005-10-27 2011-10-25 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US8098568B2 (en) 2000-09-13 2012-01-17 Qualcomm Incorporated Signaling method in an OFDM multiple access system
US8446892B2 (en) 2005-03-16 2013-05-21 Qualcomm Incorporated Channel structures for a quasi-orthogonal multiple-access communication system
US8462859B2 (en) 2005-06-01 2013-06-11 Qualcomm Incorporated Sphere decoding apparatus
US8477684B2 (en) 2005-10-27 2013-07-02 Qualcomm Incorporated Acknowledgement of control messages in a wireless communication system
US8565194B2 (en) 2005-10-27 2013-10-22 Qualcomm Incorporated Puncturing signaling channel for a wireless communication system
US8582548B2 (en) 2005-11-18 2013-11-12 Qualcomm Incorporated Frequency division multiple access schemes for wireless communication
US8582509B2 (en) 2005-10-27 2013-11-12 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US8599945B2 (en) 2005-06-16 2013-12-03 Qualcomm Incorporated Robust rank prediction for a MIMO system
US8611284B2 (en) 2005-05-31 2013-12-17 Qualcomm Incorporated Use of supplemental assignments to decrement resources
US8693405B2 (en) 2005-10-27 2014-04-08 Qualcomm Incorporated SDMA resource management
US8787347B2 (en) 2005-08-24 2014-07-22 Qualcomm Incorporated Varied transmission time intervals for wireless communication system
US8831607B2 (en) 2006-01-05 2014-09-09 Qualcomm Incorporated Reverse link other sector communication
US8879511B2 (en) 2005-10-27 2014-11-04 Qualcomm Incorporated Assignment acknowledgement for a wireless communication system
US8885628B2 (en) 2005-08-08 2014-11-11 Qualcomm Incorporated Code division multiplexing in a single-carrier frequency division multiple access system
US8917654B2 (en) 2005-04-19 2014-12-23 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US9088384B2 (en) 2005-10-27 2015-07-21 Qualcomm Incorporated Pilot symbol transmission in wireless communication systems
US9130810B2 (en) 2000-09-13 2015-09-08 Qualcomm Incorporated OFDM communications methods and apparatus
US9137822B2 (en) 2004-07-21 2015-09-15 Qualcomm Incorporated Efficient signaling over access channel
US9136974B2 (en) 2005-08-30 2015-09-15 Qualcomm Incorporated Precoding and SDMA support
US9144060B2 (en) 2005-10-27 2015-09-22 Qualcomm Incorporated Resource allocation for shared signaling channels
US9143305B2 (en) 2005-03-17 2015-09-22 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9148256B2 (en) 2004-07-21 2015-09-29 Qualcomm Incorporated Performance based rank prediction for MIMO design
US9154211B2 (en) 2005-03-11 2015-10-06 Qualcomm Incorporated Systems and methods for beamforming feedback in multi antenna communication systems
US9172453B2 (en) 2005-10-27 2015-10-27 Qualcomm Incorporated Method and apparatus for pre-coding frequency division duplexing system
US9179319B2 (en) 2005-06-16 2015-11-03 Qualcomm Incorporated Adaptive sectorization in cellular systems
US9184870B2 (en) 2005-04-01 2015-11-10 Qualcomm Incorporated Systems and methods for control channel signaling
US9209956B2 (en) 2005-08-22 2015-12-08 Qualcomm Incorporated Segment sensitive scheduling
US9225488B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Shared signaling channel
US9225416B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Varied signaling channels for a reverse link in a wireless communication system
US9246560B2 (en) 2005-03-10 2016-01-26 Qualcomm Incorporated Systems and methods for beamforming and rate control in a multi-input multi-output communication systems
US9307544B2 (en) 2005-04-19 2016-04-05 Qualcomm Incorporated Channel quality reporting for adaptive sectorization
US9461859B2 (en) 2005-03-17 2016-10-04 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9520972B2 (en) 2005-03-17 2016-12-13 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9660776B2 (en) 2005-08-22 2017-05-23 Qualcomm Incorporated Method and apparatus for providing antenna diversity in a wireless communication system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6347234B1 (en) * 1997-09-15 2002-02-12 Adaptive Telecom, Inc. Practical space-time radio method for CDMA communication capacity enhancement

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6347234B1 (en) * 1997-09-15 2002-02-12 Adaptive Telecom, Inc. Practical space-time radio method for CDMA communication capacity enhancement

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
I-TAI LU ET AL: "Sensitivity study of smart antenna systems with both transmission and reception diversities", MILITARY COMMUNICATIONS CONFERENCE PROCEEDINGS, 1999. MILCOM 1999. IEEE ATLANTIC CITY, NJ, USA 31 OCT.-3 NOV. 1999, PISCATAWAY, NJ, USA,IEEE, US, 31 October 1999 (1999-10-31), pages 949 - 953, XP010369802, ISBN: 0-7803-5538-5 *
JOONSUK KIM ET AL: "Spatial multiuser access with antenna diversity using singular value decomposition", 2000 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS. ICC 2000. GLOBAL CONVERGENCE THROUGH COMMUNICATIONS. CONFERENCE RECORD, PROCEEDINGS OF IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS, NEW ORLEANS, LA, USA, 18-22 JUNE 2000, 2000, Piscataway, NJ, USA, IEEE, USA, pages 1253 - 1257 vol.3, XP002204464, ISBN: 0-7803-6283-7 *
THOMPSON J S ET AL: "PERFORMANCE OF ANTENNA ARRAY RECEIVER ALGORITHMS FOR CDMA", COMMUNICATIONS: THE KEY TO GLOBAL PROSPERITY. GLOBECOM 1996. LONDON, NOV. 18 - 22, 1996, GLOBAL TELECOMMUNICATIONS CONFERENCE (GLOBECOM), NEW YORK, IEEE, US, vol. 1, 18 November 1996 (1996-11-18), pages 570 - 574, XP000742212, ISBN: 0-7803-3337-3 *
YIM C ET AL: "ADAPTIVE ARRAY ANTENNA BASED ON ESTIMATION OF ARRIVAL ANGLES USING DFT ON SPATIAL DOMAIN", ELECTRONICS & COMMUNICATIONS IN JAPAN, PART I - COMMUNICATIONS, SCRIPTA TECHNICA. NEW YORK, US, vol. 76, no. 8, 1 August 1993 (1993-08-01), pages 96 - 107, XP000428985, ISSN: 8756-6621 *

Cited By (53)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9130810B2 (en) 2000-09-13 2015-09-08 Qualcomm Incorporated OFDM communications methods and apparatus
US10313069B2 (en) 2000-09-13 2019-06-04 Qualcomm Incorporated Signaling method in an OFDM multiple access system
US8098568B2 (en) 2000-09-13 2012-01-17 Qualcomm Incorporated Signaling method in an OFDM multiple access system
US8098569B2 (en) 2000-09-13 2012-01-17 Qualcomm Incorporated Signaling method in an OFDM multiple access system
US9426012B2 (en) 2000-09-13 2016-08-23 Qualcomm Incorporated Signaling method in an OFDM multiple access system
US10237892B2 (en) 2004-07-21 2019-03-19 Qualcomm Incorporated Efficient signaling over access channel
US10194463B2 (en) 2004-07-21 2019-01-29 Qualcomm Incorporated Efficient signaling over access channel
US9148256B2 (en) 2004-07-21 2015-09-29 Qualcomm Incorporated Performance based rank prediction for MIMO design
US9137822B2 (en) 2004-07-21 2015-09-15 Qualcomm Incorporated Efficient signaling over access channel
US9246560B2 (en) 2005-03-10 2016-01-26 Qualcomm Incorporated Systems and methods for beamforming and rate control in a multi-input multi-output communication systems
US9154211B2 (en) 2005-03-11 2015-10-06 Qualcomm Incorporated Systems and methods for beamforming feedback in multi antenna communication systems
US8446892B2 (en) 2005-03-16 2013-05-21 Qualcomm Incorporated Channel structures for a quasi-orthogonal multiple-access communication system
US8547951B2 (en) 2005-03-16 2013-10-01 Qualcomm Incorporated Channel structures for a quasi-orthogonal multiple-access communication system
US9520972B2 (en) 2005-03-17 2016-12-13 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9461859B2 (en) 2005-03-17 2016-10-04 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9143305B2 (en) 2005-03-17 2015-09-22 Qualcomm Incorporated Pilot signal transmission for an orthogonal frequency division wireless communication system
US9184870B2 (en) 2005-04-01 2015-11-10 Qualcomm Incorporated Systems and methods for control channel signaling
US8917654B2 (en) 2005-04-19 2014-12-23 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US9307544B2 (en) 2005-04-19 2016-04-05 Qualcomm Incorporated Channel quality reporting for adaptive sectorization
US9036538B2 (en) 2005-04-19 2015-05-19 Qualcomm Incorporated Frequency hopping design for single carrier FDMA systems
US9408220B2 (en) 2005-04-19 2016-08-02 Qualcomm Incorporated Channel quality reporting for adaptive sectorization
US8611284B2 (en) 2005-05-31 2013-12-17 Qualcomm Incorporated Use of supplemental assignments to decrement resources
US8462859B2 (en) 2005-06-01 2013-06-11 Qualcomm Incorporated Sphere decoding apparatus
US9179319B2 (en) 2005-06-16 2015-11-03 Qualcomm Incorporated Adaptive sectorization in cellular systems
US8599945B2 (en) 2005-06-16 2013-12-03 Qualcomm Incorporated Robust rank prediction for a MIMO system
US8885628B2 (en) 2005-08-08 2014-11-11 Qualcomm Incorporated Code division multiplexing in a single-carrier frequency division multiple access system
US9693339B2 (en) 2005-08-08 2017-06-27 Qualcomm Incorporated Code division multiplexing in a single-carrier frequency division multiple access system
CN100544230C (en) 2005-08-18 2009-09-23 中兴通讯股份有限公司 Method for estimating angle of arrival wave and method assigning form for wave packet
US9209956B2 (en) 2005-08-22 2015-12-08 Qualcomm Incorporated Segment sensitive scheduling
US9860033B2 (en) 2005-08-22 2018-01-02 Qualcomm Incorporated Method and apparatus for antenna diversity in multi-input multi-output communication systems
US9246659B2 (en) 2005-08-22 2016-01-26 Qualcomm Incorporated Segment sensitive scheduling
US9660776B2 (en) 2005-08-22 2017-05-23 Qualcomm Incorporated Method and apparatus for providing antenna diversity in a wireless communication system
US9240877B2 (en) 2005-08-22 2016-01-19 Qualcomm Incorporated Segment sensitive scheduling
US8787347B2 (en) 2005-08-24 2014-07-22 Qualcomm Incorporated Varied transmission time intervals for wireless communication system
US9136974B2 (en) 2005-08-30 2015-09-15 Qualcomm Incorporated Precoding and SDMA support
US8565194B2 (en) 2005-10-27 2013-10-22 Qualcomm Incorporated Puncturing signaling channel for a wireless communication system
US8693405B2 (en) 2005-10-27 2014-04-08 Qualcomm Incorporated SDMA resource management
US9225488B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Shared signaling channel
US9225416B2 (en) 2005-10-27 2015-12-29 Qualcomm Incorporated Varied signaling channels for a reverse link in a wireless communication system
US9172453B2 (en) 2005-10-27 2015-10-27 Qualcomm Incorporated Method and apparatus for pre-coding frequency division duplexing system
US8582509B2 (en) 2005-10-27 2013-11-12 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US9088384B2 (en) 2005-10-27 2015-07-21 Qualcomm Incorporated Pilot symbol transmission in wireless communication systems
US8045512B2 (en) 2005-10-27 2011-10-25 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US9144060B2 (en) 2005-10-27 2015-09-22 Qualcomm Incorporated Resource allocation for shared signaling channels
US8477684B2 (en) 2005-10-27 2013-07-02 Qualcomm Incorporated Acknowledgement of control messages in a wireless communication system
US8842619B2 (en) 2005-10-27 2014-09-23 Qualcomm Incorporated Scalable frequency band operation in wireless communication systems
US8879511B2 (en) 2005-10-27 2014-11-04 Qualcomm Incorporated Assignment acknowledgement for a wireless communication system
US8681764B2 (en) 2005-11-18 2014-03-25 Qualcomm Incorporated Frequency division multiple access schemes for wireless communication
US8582548B2 (en) 2005-11-18 2013-11-12 Qualcomm Incorporated Frequency division multiple access schemes for wireless communication
US8831607B2 (en) 2006-01-05 2014-09-09 Qualcomm Incorporated Reverse link other sector communication
CN101072066B (en) 2006-05-08 2011-05-11 中兴通讯股份有限公司 Intelligent antenna realizing method for CDMA communication system
WO2012083773A1 (en) * 2010-12-20 2012-06-28 中兴通讯股份有限公司 Method and device for controlling beam-forming
CN102026387A (en) * 2010-12-20 2011-04-20 中兴通讯股份有限公司 BF (beam forming) control method and device

Similar Documents

Publication Publication Date Title
EP2741429B1 (en) Method for determining beamforming parameters in a wireless communication system and to a wireless communication system
JP4847874B2 (en) Multiuser adaptive array receiver and method
US5822380A (en) Apparatus and method for joint channel estimation
JP4531969B2 (en) Adaptive antenna receiving apparatus
RU2265929C2 (en) Method for processing fundamental frequency band basing on intelligent antenna and noise suppression
US6987819B2 (en) Method and device for multiple input/multiple output transmit and receive weights for equal-rate data streams
US7525939B2 (en) Communication system and method using a relay node
Pados et al. Joint space-time auxiliary-vector filtering for DS/CDMA systems with antenna arrays
US7043275B2 (en) Radio communication apparatus using adaptive antenna
US6081566A (en) Method and apparatus for interference rejection with different beams, polarizations, and phase references
Kohno Spatial and temporal communication theory using adaptive antenna array
JP4086574B2 (en) Path search circuit, radio reception apparatus and radio transmission apparatus
US7148845B2 (en) Antenna array including virtual antenna elements
EP2244388A2 (en) System and method for adjusting combiner weights using an adaptive algorithm in a wireless communications system
US7356073B2 (en) Method and apparatus providing an advanced MIMO receiver that includes a signal-plus-residual-interference (SPRI) detector
AU764605B2 (en) Linear signal separation using polarization diversity
US7181167B2 (en) High data rate closed loop MIMO scheme combining transmit diversity and data multiplexing
CN100393139C (en) Apparatus and method for beamforming in changing-interference environment
US8693577B2 (en) Multi-antenna communication systems utilizing RF-based and baseband signal weighting and combining
US5819168A (en) Adaptive communication system and method using unequal weighting of interface and noise
US20090190688A1 (en) Beamforming for Non-Collaborative, Space Division Multiple Access Systems
JP4260109B2 (en) Signal transmitting and receiving method in a mobile communication system
EP1263151B1 (en) Adaptive antenna reception apparatus
US6317586B1 (en) Method and base station for data transmission in a wireless communications system
KR100575993B1 (en) Method and apparatus for scheduling multi-user in wireless communication system using multiple transmit/receive antenna

Legal Events

Date Code Title Description
AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT SE SI SK TR

AK Designated states

Kind code of ref document: A1

Designated state(s): CN JP US

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase
WWW Wipo information: withdrawn in national office

Country of ref document: JP

NENP Non-entry into the national phase in:

Ref country code: JP