WO2014059658A1 - Récepteur multimode td-scdma - Google Patents

Récepteur multimode td-scdma Download PDF

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Publication number
WO2014059658A1
WO2014059658A1 PCT/CN2012/083192 CN2012083192W WO2014059658A1 WO 2014059658 A1 WO2014059658 A1 WO 2014059658A1 CN 2012083192 W CN2012083192 W CN 2012083192W WO 2014059658 A1 WO2014059658 A1 WO 2014059658A1
Authority
WO
WIPO (PCT)
Prior art keywords
mode
antenna
combining
antennas
single equivalent
Prior art date
Application number
PCT/CN2012/083192
Other languages
English (en)
Inventor
Wanlun Zhao
Insung Kang
Qiang Shen
Jilei Hou
Jinghu Chen
Original Assignee
Qualcomm Incorporated
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to PCT/CN2012/083192 priority Critical patent/WO2014059658A1/fr
Publication of WO2014059658A1 publication Critical patent/WO2014059658A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/0871—Hybrid systems, i.e. switching and combining using different reception schemes, at least one of them being a diversity reception scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/0848—Joint weighting
    • H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0868—Hybrid systems, i.e. switching and combining
    • H04B7/0874—Hybrid systems, i.e. switching and combining using subgroups of receive antennas
    • H04B7/0877—Hybrid systems, i.e. switching and combining using subgroups of receive antennas switching off a diversity branch, e.g. to save power

Definitions

  • aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to a multimode receiver including a dynamic mode selection in a TD- SCDMA network.
  • Wireless communication networks are widely deployed to provide various communication services such as telephony, video, data, messaging, broadcasts, and so on.
  • Such networks which are usually multiple access networks, support communications for multiple users by sharing the available network resources.
  • UTRAN Universal Terrestrial Radio Access Network
  • the UTRAN is the radio access network (RAN) defined as a part of the Universal Mobile Telecommunications System (UMTS), a third generation (3G) mobile phone technology supported by the 3rd Generation Partnership Project (3GPP).
  • UMTS Universal Mobile Telecommunications System
  • 3GPP 3rd Generation Partnership Project
  • the UMTS which is the successor to Global System for Mobile Communications (GSM) technologies, currently supports various air interface standards, such as Wideband-Code Division Multiple Access (W-CDMA), Time Division-Code Division Multiple Access (TD-CDMA), and Time Division-Synchronous Code Division Multiple Access (TD-SCDMA).
  • W-CDMA Wideband-Code Division Multiple Access
  • TD-CDMA Time Division-Code Division Multiple Access
  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • the UMTS also supports enhanced 3G data communications protocols, such as High Speed Packet Access (HSPA), which provides higher data transfer speeds and capacity to associated UMTS networks.
  • HSPA is a collection of two mobile telephony protocols, High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA), that extends and improves the performance of existing wideband protocols.
  • HSPA High Speed Packet Access
  • HSPA High Speed Downlink Packet Access
  • HSUPA High Speed Uplink Pack
  • FIGURE 1 is a block diagram conceptually illustrating an example of a telecommunications system.
  • FIGURE 2 is a block diagram conceptually illustrating an example of a frame structure in a telecommunications system.
  • FIGURE 3 is a block diagram conceptually illustrating an example of a node B in communication with a UE in a telecommunications system.
  • FIGURE 4 is a block diagram illustrating a method for dynamic mode selection according to one aspect of the present disclosure.
  • FIGURE 1 a block diagram is shown illustrating an example of a telecommunications system 100.
  • the various concepts presented throughout this disclosure may be implemented across a broad variety of telecommunication systems, network architectures, and communication standards.
  • the aspects of the present disclosure illustrated in FIGURE 1 are presented with reference to a UMTS system employing a TD-SCDMA standard.
  • the UMTS system includes a (radio access network) RAN 102 (e.g., UTRAN) that provides various wireless services including telephony, video, data, messaging, broadcasts, and/or other services.
  • RAN 102 e.g., UTRAN
  • the RAN 102 may be divided into a number of Radio Network Subsystems (RNSs) such as an RNS 107, each controlled by a Radio Network Controller (RNC) such as an RNC 106.
  • RNC Radio Network Controller
  • the RNC 106 is an apparatus responsible for, among other things, assigning, reconfiguring and releasing radio resources within the RNS 107.
  • the RNC 106 may be interconnected to other RNCs (not shown) in the RAN 102 through various types of interfaces such as a direct physical connection, a virtual network, or the like, using any suitable transport network.
  • the geographic region covered by the RNS 107 may be divided into a number of cells, with a radio transceiver apparatus serving each cell.
  • a radio transceiver apparatus is commonly referred to as a node B in UMTS applications, but may also be referred to by those skilled in the art as a base station (BS), a base transceiver station (BTS), a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), an access point (AP), or some other suitable terminology.
  • BS basic service set
  • ESS extended service set
  • AP access point
  • two node Bs 108 are shown; however, the RNS 107 may include any number of wireless node Bs.
  • the node Bs 108 provide wireless access points to a core network 104 for any number of mobile apparatuses.
  • a mobile apparatus include a cellular phone, a smart phone, a session initiation protocol (SIP) phone, a laptop, a notebook, a netbook, a smartbook, a personal digital assistant (PDA), a satellite radio, a global positioning system (GPS) device, a multimedia device, a video device, a digital audio player (e.g., MP3 player), a camera, a game console, or any other similar functioning device.
  • SIP session initiation protocol
  • PDA personal digital assistant
  • GPS global positioning system
  • multimedia device e.g., a digital audio player (e.g., MP3 player), a camera, a game console, or any other similar functioning device.
  • MP3 player digital audio player
  • the mobile apparatus is commonly referred to as user equipment (UE) in UMTS applications, but may also be referred to by those skilled in the art as a mobile station (MS), a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal (AT), a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other suitable terminology.
  • UE user equipment
  • MS mobile station
  • AT access terminal
  • three UEs 110 are shown in communication with the node Bs 108.
  • the downlink (DL), also called the forward link refers to the communication link from a node B to a UE
  • the uplink (UL) also called the reverse link
  • the core network 104 includes a GSM core network.
  • GSM Global System for Mobile communications
  • the core network 104 supports circuit-switched services with a mobile switching center (MSC) 112 and a gateway MSC (GMSC) 114.
  • MSC mobile switching center
  • GMSC gateway MSC
  • the MSC 112 is an apparatus that controls call setup, call routing, and UE mobility functions.
  • the MSC 112 also includes a visitor location register (VLR) (not shown) that contains subscriber-related information for the duration that a UE is in the coverage area of the MSC 112.
  • VLR visitor location register
  • the GMSC 114 provides a gateway through the MSC 112 for the UE to access a circuit- switched network 116.
  • the GMSC 114 includes a home location register (HLR) (not shown) containing subscriber data, such as the data reflecting the details of the services to which a particular user has subscribed.
  • HLR home location register
  • the HLR is also associated with an authentication center (AuC) that contains subscriber- specific authentication data.
  • AuC authentication center
  • the core network 104 also supports packet-data services with a serving GPRS support node (SGSN) 118 and a gateway GPRS support node (GGSN) 120.
  • GPRS which stands for General Packet Radio Service, is designed to provide packet-data services at speeds higher than those available with standard GSM circuit- switched data services.
  • the GGSN 120 provides a connection for the RAN 102 to a packet-based network 122.
  • the packet-based network 122 may be the Internet, a private data network, or some other suitable packet-based network.
  • the primary function of the GGSN 120 is to provide the UEs 110 with packet- based network connectivity. Data packets are transferred between the GGSN 120 and the UEs 110 through the SGSN 118, which performs primarily the same functions in the packet- based domain as the MSC 112 performs in the circuit-switched domain.
  • the UMTS air interface is a spread spectrum Direct-Sequence Code Division Multiple Access (DS-CDMA) system.
  • DS-CDMA Spread spectrum Direct-Sequence Code Division Multiple Access
  • the TD-SCDMA standard is based on such direct sequence spread spectrum technology and additionally calls for a time division duplexing (TDD), rather than a frequency division duplexing (FDD) as used in many FDD mode UMTS/W-CDMA systems.
  • TDD uses the same carrier frequency for both the uplink (UL) and downlink (DL) between a node B 108 and a UE 110, but divides uplink and downlink transmissions into different time slots in the carrier.
  • FIGURE 2 shows a frame structure 200 for a TD-SCDMA carrier.
  • the TD-SCDMA carrier as illustrated, has a frame 202 that is 10 ms in length.
  • the chip rate in TD-SCDMA is 1.28 Mcps.
  • the frame 202 has two 5 ms subframes 204, and each of the subframes 204 includes seven time slots, TSO through TS6.
  • the first time slot, TSO is usually allocated for downlink communication
  • the second time slot, TSl is usually allocated for uplink communication.
  • the remaining time slots, TS2 through TS6 may be used for either uplink or downlink, which allows for greater flexibility during times of higher data transmission times in either the uplink or downlink directions.
  • a downlink pilot time slot (DwPTS) 206, a guard period (GP) 208, and an uplink pilot time slot (UpPTS) 210 are located between TSO and TS1.
  • Each time slot, TS0-TS6, may allow data transmission multiplexed on a maximum of 16 code channels.
  • Data transmission on a code channel includes two data portions 212 (each with a length of 352 chips) separated by a midamble 214 (with a length of 144 chips) and followed by a guard period (GP) 216 (with a length of 16 chips).
  • the midamble 214 may be used for features, such as channel estimation, while the guard period 216 may be used to avoid inter-burst interference.
  • Synchronization Shift bits 218 are also transmitted in the data portion.
  • Synchronization Shift bits 218 only appear in the second part of the data portion.
  • the Synchronization Shift bits 218 immediately following the midamble can indicate three cases: decrease shift, increase shift, or do nothing in the upload transmit timing.
  • the positions of the SS bits 218 are not generally used during uplink communications .
  • FIGURE 3 is a block diagram of a node B 310 in communication with a UE 350 in a RAN 300, where the RAN 300 may be the RAN 102 in FIGURE 1, the node B 310 may be the node B 108 in FIGURE 1, and the UE 350 may be the UE 110 in FIGURE 1.
  • a transmit processor 320 may receive data from a data source 312 and control signals from a controller/processor 340. The transmit processor 320 provides various signal processing functions for the data and control signals, as well as reference signals (e.g., pilot signals).
  • the transmit processor 320 may provide cyclic redundancy check (CRC) codes for error detection, coding and interleaving to facilitate forward error correction (FEC), mapping to signal constellations based on various modulation schemes (e.g., binary phase-shift keying (BPSK), quadrature phase-shift keying (QPSK), M- phase-shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM), and the like), spreading with orthogonal variable spreading factors (OVSF), and multiplying with scrambling codes to produce a series of symbols.
  • BPSK binary phase-shift keying
  • QPSK quadrature phase-shift keying
  • M-PSK M- phase-shift keying
  • M-QAM M-quadrature amplitude modulation
  • OVSF orthogonal variable spreading factors
  • These channel estimates may be derived from a reference signal transmitted by the UE 350 or from feedback contained in the midamble 214 (FIGURE 2) from the UE 350.
  • the symbols generated by the transmit processor 320 are provided to a transmit frame processor 330 to create a frame structure.
  • the transmit frame processor 330 creates this frame structure by multiplexing the symbols with a midamble 214 (FIGURE 2) from the controller/processor 340, resulting in a series of frames.
  • the frames are then provided to a transmitter 332, which provides various signal conditioning functions including amplifying, filtering, and modulating the frames onto a carrier for downlink transmission over the wireless medium through smart antennas 334 (334-1, ...,334-N).
  • the smart antennas 334 may be implemented with beam steering bidirectional adaptive antenna arrays or other similar beam technologies.
  • a receiver 354 receives the downlink transmission through an antenna 352 (352-1, ...,352-N) and processes the transmission to recover the information modulated onto the carrier.
  • the information recovered by the receiver 354 is provided to a receive frame processor 360, which parses each frame, and provides the midamble 214 (FIGURE 2) to a channel processor 394 and the data, control, and reference signals to a receive processor 370.
  • the receive processor 370 then performs the inverse of the processing performed by the transmit processor 320 in the node B 310. More specifically, the receive processor 370 descrambles and despreads the symbols, and then determines the most likely signal constellation points transmitted by the node B 310 based on the modulation scheme.
  • the soft decisions may be based on channel estimates computed by the channel processor 394.
  • the soft decisions are then decoded and deinterleaved to recover the data, control, and reference signals.
  • the CRC codes are then checked to determine whether the frames were successfully decoded.
  • the data carried by the successfully decoded frames will then be provided to a data sink 372, which represents applications running in the UE 350 and/or various user interfaces (e.g., display).
  • Control signals carried by successfully decoded frames will be provided to a controller/processor 390.
  • the controller/processor 390 may also use an acknowledgement (ACK) and/or negative acknowledgement (NACK) protocol to support retransmission requests for those frames.
  • ACK acknowledgement
  • NACK negative acknowledgement
  • a transmit processor 380 receives data from a data source 378 and control signals from the controller/processor 390 and provides various signal processing functions including CRC codes, coding and interleaving to facilitate FEC, mapping to signal constellations, spreading with OVSFs, and scrambling to produce a series of symbols.
  • Channel estimates may be used to select the appropriate coding, modulation, spreading, and/or scrambling schemes.
  • the symbols produced by the transmit processor 380 will be provided to a transmit frame processor 382 to create a frame structure.
  • the transmit frame processor 382 creates this frame structure by multiplexing the symbols with a midamble 214 (FIGURE 2) from the controller/processor 390, resulting in a series of frames.
  • the frames are then provided to a transmitter 356, which provides various signal conditioning functions including amplification, filtering, and modulating the frames onto a carrier for uplink transmission over the wireless medium through the antenna 352.
  • the uplink transmission is processed at the node B 310 in a manner similar to that described in connection with the receiver function at the UE 350.
  • a receiver 335 receives the uplink transmission through the antenna 334 and processes the transmission to recover the information modulated onto the carrier.
  • the information recovered by the receiver 335 is provided to a receive frame processor 336, which parses each frame, and provides the midamble 214 (FIGURE 2) to the channel processor 344 and the data, control, and reference signals to a receive processor 338.
  • the receive processor 338 performs the inverse of the processing performed by the transmit processor 380 in the UE 350.
  • the data and control signals carried by the successfully decoded frames may then be provided to a data sink 339 and the controller/processor, respectively. If some of the frames were unsuccessfully decoded by the receive processor, the controller/processor 340 may also use an acknowledgement (ACK) and/or negative acknowledgement (NACK) protocol to support retransmission requests for those frames.
  • ACK acknowledgement
  • NACK
  • the controller/processors 340 and 390 may be used to direct the operation at the node B 310 and the UE 350, respectively.
  • the controller/processors 340 and 390 may provide various functions including timing, peripheral interfaces, voltage regulation, power management, and other control functions.
  • the computer readable media of memories 342 and 392 may store data and software for the node B 310 and the UE 350, respectively.
  • the memory 392 of the UE 350 may store a dynamic mode selection module 391 which, when executed by the controller/processor 390, configures the UE 350 for performing a dynamic mode selection.
  • a scheduler/processor 346 at the node B 310 may be used to allocate resources to the UEs and schedule downlink and/or uplink transmissions for the UEs.
  • a demodulator is specified to be used in various conditions including, but not limited to, single cell/multicell, low signal to interference noise ratio (SINR), and high SINR.
  • SINR low signal to interference noise ratio
  • Different demodulation algorithms may be specified for different conditions to improve performance.
  • dual receive antenna modems may use a design with spatial combining followed by single antenna linear multiuser detectors (LMUD) or multicell joint detectors (MCJD). After cross antenna combining or spatial combining, equivalent single antenna coefficients are formed. LMUD or MCJD algorithms operate on these equivalent channels. Spatial combining may be implemented with multiple modes. Appropriate switching among these mode enable the best coverage of practical scenarios.
  • LMUD single antenna linear multiuser detectors
  • MJD multicell joint detectors
  • the spatial combining (SC) algorithm specified for TDS-CDMA downlink with dual receive antennas can support several modes.
  • these modes include cross antenna combining based on the minimum mean squared error (MMSE)principle, MMSE cross antenna combining with covariance perturbations, cross antenna combining based on pilot weight combining (PWC), and antenna selection based on received SINR.
  • MMSE minimum mean squared error
  • PWC pilot weight combining
  • the cross antenna combining based on the minimum mean squared error (MMSE) principle mode may improve local processing when interfering signals do not have Walsh domain structures.
  • MMSE minimum mean squared error
  • diagonal terms may be added to the covariance matrix. That is, because interfering cells can be highly structured or near white in Walsh domain at different times, adding diagonal terms to covariance matrix may improve performance. Accordingly, adding the diagonal terms may provide a more robust overall SC-LMUD performance under different interference Walsh loadings.
  • the pilot weight combining (PWC) is a robust scheme for single cell high SNR, where noise variance estimation is often unreliable. It is also very robust when receive antennas are highly correlated.
  • the antenna selection based on received SINR mode may be used when high antenna imbalance occurs.
  • the weak antenna does not contribute much to error performance improvement, still, the weak antenna may consume power and decrease performance.
  • One aspect of the present disclosure is directed to short term and/or long term switching between the modes.
  • one aspect is directed to selecting the best mode for a particular scenario to improve performance.
  • short term mode switching may be based on covariance matrix condition numbers.
  • the condition number of a matrix is the ratio between its largest and the smallest eigen values. For high SINR and high correlation scenarios, the condition number is often very large. In some cases, the performance is improved when the PWC mode is used in these conditions.
  • mode switching may also be based on Walsh loadings from interfering cells.
  • long term mode switching may be based on antenna imbalances.
  • a spatial combining component is used to combine multiple antenna samples to form a single equivalent antenna.
  • a single antenna LMUD may then be performed on the single equivalent antenna.
  • the spatial combining component may specify various modes. Each mode performs differently and may be used for different scenarios. For example, in one mode, the strongest antenna is selected as the single equivalent antenna. Another mode specifies for the PWC combine, still another mode specifies for a MMSE combine, still yet another mode specifies for MMSE combining with covariance perturbations.
  • the combining mode may be selected based on a covariance condition number. That is, the covariance condition number is determined for a covariance matrix. If the covariance condition number is greater than a threshold, then the matrix is near singular, and the PWC combine mode may be selected if the mode is more robust and numerically stable. In other cases, the MMSE combine may be selected. Accordingly, the present aspect determines the best mode and selects the best mode to improve the system performance.
  • multimode SC design and dynamic mode selections may be desirable because different SC modes have small differences and may be implemented together. Additionally, the multimode SC design and dynamic mode selections may specify a more robust and flexible receiver design that covers a wide range of scenarios.
  • FIGURE 4 shows a wireless communication method 400 according to one aspect of the disclosure.
  • a UE receives communication on a plurality of antennas, as shown in block 402.
  • the UE also combines antenna samples of the plurality of antennas via a combining mode algorithm to form a single equivalent antenna, as shown in block 404.
  • the UE receives communication on a plurality of antennas, as shown in block 402.
  • the UE also combines antenna samples of the plurality of antennas via a combining mode algorithm to form a single equivalent antenna, as shown in block 404.
  • the UE receives communication on a plurality of antennas, as shown in block 402.
  • the UE also combines antenna samples of the plurality of antennas via a combining mode algorithm to form a single equivalent antenna, as shown in block 404.
  • the UE receives communication on a plurality of antennas, as shown in block 402.
  • the UE also combines antenna samples of the plurality of antennas via a combining mode algorithm to form
  • LMUD linear multiuser detector
  • LTE Long Term Evolution
  • LTE-A LTE-Advanced
  • CDMA2000 Evolution-Data Optimized
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • IEEE 802.16 WiMAX
  • IEEE 802.20 Ultra- Wideband
  • Bluetooth Bluetooth
  • the actual telecommunication standard, network architecture, and/or communication standard employed will depend on the specific application and the overall design constraints imposed on the system.
  • processors have been described in connection with various apparatuses and methods. These processors may be implemented using electronic hardware, computer software, or any combination thereof. Whether such processors are implemented as hardware or software will depend upon the particular application and overall design constraints imposed on the system.
  • a processor, any portion of a processor, or any combination of processors presented in this disclosure may be implemented with a microprocessor, microcontroller, digital signal processor (DSP), a field-programmable gate array (FPGA), a programmable logic device (PLD), a state machine, gated logic, discrete hardware circuits, and other suitable processing components configured to perform the various functions described throughout this disclosure.
  • DSP digital signal processor
  • FPGA field-programmable gate array
  • PLD programmable logic device
  • the functionality of a processor, any portion of a processor, or any combination of processors presented in this disclosure may be implemented with software being executed by a microprocessor, microcontroller, DSP, or other suitable platform.
  • Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.
  • the software may reside on a computer-readable medium.
  • a computer-readable medium may include, by way of example, memory such as a magnetic storage device (e.g., hard disk, floppy disk, magnetic strip), an optical disk (e.g., compact disc (CD), digital versatile disc (DVD)), a smart card, a flash memory device (e.g., card, stick, key drive), random access memory (RAM), read only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), a register, or a removable disk.
  • memory is shown separate from the processors in the various aspects presented throughout this disclosure, the memory may be internal to the processors (e.g., cache or register).
  • Computer-readable media may be embodied in a computer-program product.
  • a computer-program product may include a computer-readable medium in packaging materials.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de communication sans fil. Le procédé comprend les étapes consistant à disposer de deux antennes actives et à combiner les échantillons d'antenne des deux antennes par l'intermédiaire d'un processus de mode de combinaison pour former une antenne équivalente unique. Le processus de mode de combinaison est choisi sur la base au moins en partie d'un nombre de conditionnement pour une matrice de covariance, d'un facteur de Walsh pour une cellule parasite, ou un déséquilibre d'antenne. Le processus de mode de combinaison est un mode de combinaison de pondération pilote (PWC), un mode d'erreur quadratique moyenne minimale (MMSE), un MMSE avec mode de perturbation de covariance, ou un mode de déséquilibre d'antenne.
PCT/CN2012/083192 2012-10-19 2012-10-19 Récepteur multimode td-scdma WO2014059658A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005046060A1 (fr) * 2002-04-11 2005-05-19 Bae Systems Information And Electronic Systems Integration Inc. Modele ameliore de detecteur multi-utilisateur turbo et procede correspondant
US7567609B2 (en) * 2005-02-03 2009-07-28 Samsung Electronics Co., Ltd. Space-time multiuser detector in mobile communication system and method thereof
CN102104562A (zh) * 2009-12-17 2011-06-22 中兴通讯股份有限公司 一种多天线干扰抑制合并的方法及装置
CN102215056A (zh) * 2010-04-01 2011-10-12 思亚诺移动芯片有限公司 用于接收通信信号的方法、设备和系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005046060A1 (fr) * 2002-04-11 2005-05-19 Bae Systems Information And Electronic Systems Integration Inc. Modele ameliore de detecteur multi-utilisateur turbo et procede correspondant
US7567609B2 (en) * 2005-02-03 2009-07-28 Samsung Electronics Co., Ltd. Space-time multiuser detector in mobile communication system and method thereof
CN102104562A (zh) * 2009-12-17 2011-06-22 中兴通讯股份有限公司 一种多天线干扰抑制合并的方法及装置
CN102215056A (zh) * 2010-04-01 2011-10-12 思亚诺移动芯片有限公司 用于接收通信信号的方法、设备和系统

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