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3677results about "Diversity/multi-antenna systems" patented technology

Determination of a channel estimate of a transmission channel

A method of determining a channel estimate of a first transmission channel in a communications system. The method comprises deriving a first set of channel estimates from symbols received through said first transmission channel; deriving a second set of channel estimates from symbols received through a second transmission channel in the communications system; determining a scale factor between the first and second sets of channel estimates from a least squares error criterion; and determining the channel estimate of the first transmission channel as a channel estimate of the second transmission channel scaled by the determined scale factor.
Owner:TELEFON AB LM ERICSSON (PUBL)

Coding scheme for a wireless communication system

Coding techniques for a (e.g., OFDM) communication system capable of transmitting data on a number of "transmission channels" at different information bit rates based on the channels' achieved SNR. A base code is used in combination with common or variable puncturing to achieve different coding rates required by the transmission channels. The data (i.e., information bits) for a data transmission is encoded with the base code, and the coded bits for each channel (or group of channels with the similar transmission capabilities) are punctured to achieve the required coding rate. The coded bits may be interleaved (e.g., to combat fading and remove correlation between coded bits in each modulation symbol) prior to puncturing. The unpunctured coded bits are grouped into non-binary symbols and mapped to modulation symbols (e.g., using Gray mapping). The modulation symbol may be "pre-conditioned" and prior to transmission.
Owner:QUALCOMM INC

Distributed antenna system for wireless network systems

A distributed antenna system is provided for communicating with a plurality of base stations. The distributed antenna system includes a system controller and a master unit communicating with at least one of the plurality of base stations. A remote unit communicates over a high data rate media with the master unit and / or a downstream remote unit. Alternatively, the distributed antenna system includes a controller and a digital time / space crosspoint switch controlled by the controller. A digitizing transceiver is in communication with the digital time / space crosspoint switch. The crosspoint switch is configured to transmit and receive digital data through the digitizing transceiver.
Owner:COMMSCOPE TECH LLC

Programmable radio frequency sub-system with integrated antennas and filters and wireless communication device using same

The present invention relates generally to radio communication devices. More particularly, the present invention relates to a programmable radio frequency (RF) sub-system and wireless communications devices using such an integrated antenna / filter sub-system. In one embodiment, the programmable RF front end subassembly includes two antennas, RF filter sections that are integral to each antenna, and a programmable logic device as an antenna control unit. Each antenna consists of a planar inverted "F" antenna (PIFA) that is tuned to operate over a range of frequencies using voltage variable capacitors or RF switches that connect various capacitive loads in order to achieve the desired resonant frequencies. The wireless communication device further includes a control circuit coupled to the antenna to provide the control signals.
Owner:E TENNA CORP

MIMO precoding enabling spatial multiplexing, power allocation and adaptive modulation and coding

In a closed-loop wireless communication system, a codebook-based feedback mechanism is provided to enable non-unitary precoding for multi-stream transmission, where in each stream is optimized with suitable transmission power allocation and AMC. The codebook-based feedback mechanism uses a precoding codebook having a power allocation matrix which is constrained to specify that beamforming always applies full power to a predetermined beam. With this constraint, a one-bit power allocation feedback index may be used to switch between beamforming and spatial multiplexing.
Owner:APPLE INC

Method and apparatus for reference signal processing in an orthogonal frequency division multiplexing communication system

A wireless communication includes a base station that configures a set of non-zero power reference signals corresponding to multiple potential transmission points to one or more users equipment UEs and configures at least one zero-power reference signal, with zero transmission power from one or more of the multiple transmission points. The base station transmits configuration information to at least one UE of the one more UEs, wherein the configuration information corresponds to a set of resource elements that are associated with a set of channel state information reference signals and wherein the set of channel state information reference signals include the set of nonzero-power reference signals and the at least one zero-power reference signal. The UE then performs a channel measurement based on one or more non-zero-power reference signals of the set of non-zero-power reference signals and performs an interference measurement based on the at least one zero-power reference signal.
Owner:GOOGLE TECH HLDG LLC

Preambles in Ofdma System

The present invention provides a preamble that is inserted into an OFDMA frame and has a common sequence for all the base stations participating in a transmission. The subscriber station performs fine synchronization using the common sequence on the common preamble, and the resulting peaks will provide the locations of candidate base stations. The base station specific search is then performed in the vicinities of those peaks by using base station specific pseudo-noise sequences. With this two stage cell search, the searching window is drastically reduced. The preamble is matched to known values by a respective receiver to decode the signals and permit multiple signals to be transferred from the transmitter to the receiver. The preamble may comprise two parts, Preamble-1 and Preamble-2, which may be used in different systems, including multioutput, multi-input (MIMO) systems.
Owner:APPLE INC

Coding scheme for a wireless communication system

Coding techniques for a (e.g., OFDM) communication system capable of transmitting data on a number of “transmission channels” at different information bit rates based on the channels' achieved SNR. A base code is used in combination with common or variable puncturing to achieve different coding rates required by the transmission channels. The data (i.e., information bits) for a data transmission is encoded with the base code, and the coded bits for each channel (or group of channels with the similar transmission capabilities) are punctured to achieve the required coding rate. The coded bits may be interleaved (e.g., to combat fading and remove correlation between coded bits in each modulation symbol) prior to puncturing. The unpunctured coded bits are grouped into non-binary symbols and mapped to modulation symbols (e.g., using Gray mapping). The modulation symbol may be “pre-conditioned” and prior to transmission.
Owner:QUALCOMM INC

Method and apparatus of transmitting information in wireless communication system

A method and an apparatus of transmitting information in a wireless communication system are provided. The method includes transmitting first information based on a first resource index through a first antenna and transmitting second information based on a second resource index through a second antenna.
Owner:LG ELECTRONICS INC

Multi-user MIMO-SDMA for finite rate feedback systems

A multi-user MIMO downlink beamforming system with limited feedback (200) is provided to enable preceding for multi-stream transmission, where a channel codeword (ui) and one or more channel quality indicator values (CQIA, CQIB) are computed at the user equipment (201.i) on the basis of maximizing a predetermined SINR performance metric (ρi) which estimates the receive signal-to-noise-ratio (SINR) at the user equipment (201.i). The computed codeword (ui) and CQI values (or differential values related thereto) are quantized and fed back to help the base station (210) which applies a correction to the appropriate CQI value in the course of designing the transmit beamforming vectors w and determining the appropriate modulation and coding level to be used for downlink data transmission.
Owner:APPLE INC

Implementing wireless power transfer with 60 ghz mmwave communication

A system and method are provided to form multiple separate beamformed wireless communication links between a 60 GHz mmWave transmitter and a cooperating 60 GHz mmWave receiver, to transfer not only wireless data communication between the cooperating devices, but also to transmit usable wireless power between the cooperating devices. These systems and methods employ a technology for establishing multiple beamformed wireless communication links between cooperating 60 GHz mmWave communication devices to transfer wireless data communication between the cooperating devices, and separately to transmit usable wireless power between the cooperating devices over separate wireless directional beamformed links between the devices providing efficient and effective wireless power transmission between the devices based on the directionality of the beamformed links. Because 60 GHz mmWave transmissions are highly directional, with beamwidths on the order of 10-20 degrees, power loss based on wasted energy when compared to existing omnidirectional wireless power transmission systems is significantly reduced.
Owner:INTEL CORP

Method and apparatus for providing downlink acknowledgments and transmit indicators in an orthogonal frequency division multiplexing communication system

A communication system provides downlink acknowledgments corresponding to uplink transmission using hybrid automatic repeat request to multiple users in an Orthogonal Frequency Division Multiplexing communication system, wherein a frequency bandwidth comprises multiple frequency sub-carriers, by spreading each acknowledgment of multiple acknowledgments with a selected spreading sequence of multiple spreading sequences to produce multiple spread acknowledgments, wherein each acknowledgment is intended for a different user of the multiple users, and distributing the multiple spread acknowledgments across the multiple frequency sub-carriers.
Owner:GOOGLE TECH HLDG LLC

Dual-mode shared OFDM methods/transmitters, receivers and systems

A wireless terminal and network terminal are provided for implementing a new uplink OFDM protocol. In the new protocol, the wireless terminal has a first transmit chain for generating and transmitting a low rate mode OFDM transmission in a first frequency band of the OFDM band; and a second transmit chain for generating and transmitting a burst-mode transmission in a second frequency band of the OFDM band, the first frequency band being distinct from the second frequency band. An access channel is provided which is overlaid over the low rate mode transmissions of other users.
Owner:APPLE INC

Approach to a unified su-mimo/mu-mimo operation

An apparatus and method to dynamically schedule user devices in a wireless communication system in single-user multiple-input multiple-output (SU-MIMO) or multiple-user multiple-input multiple-output (MU-MIMO) modes of operation. The dynamic scheduling employs an efficient differential reporting of channel state information that reduces uplink feedback overhead, whereby a base layer value of a channel quality indicator (CQI) is reported in conjunction with a CQI offset value. Antenna subset selection is also reported. The offset value reflects gains by detection with successive interference cancellation if multiple antennas are reported (rank>1), while it reflects the actual offset between single-layer SU-MIMO CQI and MU-MIMO CQI if a single antenna is reported. Scheduled SU-MIMO mode of operation is optimized for a user reporting either a single antenna or multiple antennas, whereas MU-MIMO operation is optimized for a user reporting a single antenna.
Owner:QUALCOMM INC

Wireless communication system and method using multiple antennas

A wireless communication system, and method using multiple antennas, includes a base station that applies predetermined weight vectors to multi-user signals and transmits the multi-user signals through a plurality of transmission antennas, and a plurality of mobile stations that receive and process the multi-user signals, wherein each mobile station includes a signal reception unit that processes the multi-user signals, and a feedback signal generation unit that estimates channel characteristics, over which the multi-user signals have been transmitted, from the multi-user signals, classifies a plurality of weight vectors to be applied to the estimated channel characteristics into a plurality of sets such that vectors orthogonal to one another are classified into a single set, selects a set maximizing a transmission capacity from among the classified sets, and feeds back weight indexes of weight vectors included in the selected set and weighted channel information to the base station.
Owner:NOKIA SOLUTIONS & NETWORKS OY

Method and apparatus for controlling interference in wireless communication system

A method and apparatus for transmitting control information is provided for use in detection of interference an signal in a wireless communication system. An interference control method of a base station of a mobile communication system includes scheduling data to be transmitted to a terminal and transmitting control information including data channel information on the scheduled data and interference signal information to the terminal.
Owner:SAMSUNG ELECTRONICS CO LTD

Reference Signal Resource Allocation for Single User MIMO

Transmission with multiple antennas in a wireless network is performed by transmitting a plurality of reference sequences (RS) from a UE. A first RS s1[k] is produced using a first cyclic shift and a base sequence s0[k], wherein k={1, 2 . . . K} is an element index. A second RS s2[k] is produced using a second cyclic shift and s0[k]. A first symbol sequence x1[k] is produced using at least s1[k] and s2[k], for at least one k. A second symbol sequence x2[k] is produced using at least s1[k] and s2[k], for at least one k. x1[k] is transmitted using a first transmit antenna and x2[k] is transmitted using a second transmit antenna.
Owner:TEXAS INSTR INC

System, method and apparatus for mobile transmit diversity using symmetric phase difference

Communication is performed for a first communication device having a set of antenna elements. A quality-indication signal is received from a second communication device (e.g., a basestation). A complex weighting is calculated based on the quality-indication signal. A pre-transmission signal is modified based on the complex transmit diversity weighting to produce a set of modified-pre-transmission signals, wherein the modifications are symmetric by making approximately half the magnitude of the transmit diversity modification to one signal in a first direction, and approximately half the magnitude of the transmit diversity modification to the other signal in a second direction, opposite the first direction. Each modified pre-transmission signal from the set of modified-pre-transmission signals is uniquely associated with an antenna element from the set of antenna elements. The set of modified-pre-transmission signals is sent from the set of antenna elements to produce a transmitted signal.
Owner:GOOGLE LLC

System and method for interference mitigation for wireless communication

InactiveUS20050122999A1Facilitate interference mitigationEnables utilization of spectrumFrequency-division multiplexDiversity/multi-antenna systemsTime domainFrequency spectrum
Disclosed are systems and methods which provide interference mitigation by making alternative resources available within areas served by wireless communication links. Embodiments provide multiple channel availability in establishing wireless communication links to facilitate interference mitigation. Time domain techniques, spatial processing techniques, and / or frequency domain techniques may be implemented for spectrum management. Embodiments provide wireless base station configurations in which all or a plurality of base station sectors use a same frequency channel and / or in which each sector or a plurality of sectors use all frequency channels. Multi-channel strategies may be implemented such as to provide dynamic selection of a “best” frequency channel, to provide transmission of identical data on multiple channels for combining / selection at the receiver, and / or to provide for dividing the data for transmission on multiple channels.
Owner:HEWLETT-PACKARD ENTERPRISE DEV LP

Rate-adaptive methods for communicating over multiple input/multiple output wireless systems

A rate-adaptive method of communicating over a multipath wireless communication system uses multiple links such that each end of a link uses multiple transmit and receive antennas. A number of independent streams that are to be transmitted for each link is determined based on an overall system performance measure. In addition, the system may also jointly determine the best modulation, coding, power control, and frequency assignment for each link, based on an overall system performance measure. In OFDM systems, the number of independent streams, as well as the modulation, coding, and power control, may be determined on a tone-by-tone basis based on an overall system performance measure.
Owner:SONY CORP

Apparatus, systems and methods for providing time diversity for mobile broadcast services

Systems, methods, apparatus are provided for providing to a receiver a time diverse digital signal corresponding to a service including receiving a digital signal containing a service content and receiving a digital signal containing a non-deterministic content. The service content is inserted into a first predetermined number of data packets in a first predetermined number of data frames deterministically. In addition, a first portion of the non-deterministic content is inserted into a second predetermined number of data packets in the first predetermined number of data frames. A copy of the first predetermined number of data packets is generated. The first predetermined number of data frames is broadcast over a distribution network. The copy of the first predetermined number of data packets is inserted into a second predetermined number of data frames and a second portion of the non-deterministic content is inserted into the second predetermined number of data frames. The second predetermined number of data frames is broadcast after a predetermined time.
Owner:ROHDE & SCHWARZ GMBH & CO KG

Portable radio communication apparatus provided with a boom portion and a part of housing operating as an antenna

In a portable radio communication apparatus including a housing, at least one part of at least one of the housing is formed as a housing electrical conductor portion by an electrically conductive material. The housing electrical conductor portion is connected with a radio communication circuit of the portable radio communication apparatus so as to operate as at least one part of an unbalanced type antenna of the radio communication circuit. Further, the portable radio communication apparatus further includes a boom portion coupled with the housing at least at two positions so as to provide at least one penetrating hole between the housing and the boom portion.
Owner:PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA

Method and apparatus of transmitting reference signal for uplink transmission

A method and apparatus of transmitting a reference signal in a wireless communication system is provided. The method includes generating a precoded reference signal or a non-precoded reference signal in accordance with a rank, and transmitting the generated reference signal. Uplink transmission using multiple transmit antennas is supported through reference signal design and related control signaling.
Owner:LG ELECTRONICS INC

Pre-coder selection based on resource block grouping

The present invention provides a receiver. In one embodiment, the receiver includes a receive portion employing transmission signals from a transmitter having multiple antennas and capable of providing channel estimates. The receiver also includes a feedback generator portion configured to provide to the transmitter a pre-coder selection for data transmission that is based on the channel estimates, wherein the pre-coder selection corresponds to a grouping of frequency-domain resource blocks. The present invention also provides a transmitter having multiple antennas. In one embodiment, the transmitter includes a transmit portion coupled to the multiple antennas and capable of applying pre-coding to a data transmission for a receiver. The transmitter also includes a feedback decoding portion configured to decode a pre-coder selection for the data transmission that is fed back from the receiver, wherein the pre-coder selection corresponds to a grouping of frequency-domain resource blocks.
Owner:TEXAS INSTR INC
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