Sony Corporation

Nvidia Corporation

Ipwireless, Inc.

Kabushiki Kaisha Toshiba

Vishakan Ponnampalam

Peter Bruce Darwood

Martin Warwick Beale

Alan Edward Jones

Nicholas William Anderson

Magnus Stig Torsten Sandell

Henning Vetter

A cellular communication system comprises a Multiple-In Multiple-Out, MIMO, transmitter and receiver. The MIMO transmitter comprises a message generator for generating MIMO messages comprising selected training sequences and transceivers transmitting the messages on a plurality of antennas. The training sequences are selected by a midamble selector from a set of training sequences in response to an associated antenna on which the message is to be transmitted. The set of training sequences is associated with the cell of the MIMO transmitter and comprises disjoint subsets of training sequences for each of the plurality of antennas. The receiver comprises a transmit antenna detector which determines which antenna of the MIMO transmitter the message is transmitted from in response to the training sequence of the received message.

Selection of training sequences for Multiple-In Multiple-Out transmissions

The present invention relates to demodulation of radio signals from a base station having collocated transmit antennas, and more particularly to signaling allocation information from a base station to a mobile terminal. The allocation information may include timeslot and code information of allocation to other mobile terminals. Some embodiments of the present invention facilitate a mobile terminal's ability to receive and demodulate a signal containing multiple interfering signals by communicating codes allocated to other mobile terminals.

Signaling MIMO allocations

Allocation of multiple training sequences transmitted in a MIMO timeslot from multiple transmit antenna elements is provided. For example, a method of generating signals in a MIMO timeslot, the method comprising: selecting a first training sequence; preparing a first data payload; generating a first signal including the prepared first data payload and the first training sequence; transmitting the first signal in a MIMO timeslot from a first antenna of a network element; selecting a second training sequence, wherein the second training sequence is different from first training sequence; preparing a second data payload; generating a second signal including the prepared second data payload and the second training sequence; and transmitting the second signal in the MIMO timeslot from a second antenna of the network element.

Midamble allocations for MIMO transmissions

A cellular communication system comprises a Multiple-In Multiple-Out (MIMO) transmitter and receiver. The MIMO transmitter comprises a message generator for generating MIMO messages comprising selected training sequences and transceivers transmitting the messages on a plurality of antennas. The training sequences are selected by a midamble selector from a set of training sequences in response to an associated antenna on which the message is to be transmitted. The set of training sequences is associated with the cell of the MIMO transmitter and comprises disjoint subsets of training sequences for each of the plurality of antennas. The receiver comprises a transmit antenna detector which determines which antenna of the MIMO transmitter the message is transmitted from in response to the training sequence of the received message.

Selection of training sequences for multiple-in multiple-out transmissions

Precoding information prior to MIMO transmission is described, comprising determining a suitable preceding perturbation. The perturbation is determined by assembling a list of candidate perturbations in reduced lattice space, transforming these back into information lattice space and determining which candidate precoder perturbation is most suitable given a performance criterion.

Multi-antenna wireless communications method and apparatus with vector perturbation with a reduced lattice

A cellular communication system Multiple-In Multiple-Out, MIMO, transmitter includes a plurality of antennas, a selector that selects training sequences for messages, a generator that generates messages including selected training sequences, and a transmitter that transmits the messages on the plurality of antennas. The selector selects a training sequence for a message from a set of training sequences in response to an associated antenna on which the message is to be transmitted. The set of training sequences is associated with a cell of the MIMO transmitter and includes disjoint subsets of training sequences for each of the plurality of antennas.

An Orthogonal Frequency Division Multiplex (OFDM) communication system comprises OFDM transmitters and an OFDM receiver. The system comprises a subcarrier status data controller for transmitting subcarrier status data to the OFDM receiver. The subcarrier status data indicates the active subcarriers of the OFDM transmitters. The OFDM receiver comprises a receiver which receives a signal comprising a desired signal component from a first OFDM transmitter and interference from at least one interfering OFDM transmitter. The OFDM receiver further comprises a subcarrier status processor which receives the subcarrier status data and a channel estimator which determines channel estimates for at least an air interface communication channel from the first OFDM transmitter and an air interface communication channel from the interfering OFDM transmitter. An interference mitigation processor performs interference mitigation of the interference in response to the subcarrier status data and the channel estimates.

Interference mitigation for orthogonal frequency division multiplexing communication

A cellular communication system comprises a first communication network arranged to use a single cell identifier reuse pattern; a second communication network comprising a cluster of communication cells and arranged to use a common cell identifier reuse pattern for broadcast transmissions. The cellular communication system further comprises management logic () having broadcast mode logic () operably coupled to at least the second communication network; and a plurality of wireless serving communication units operably coupled to the management logic. The broadcast mode logic () applies the same common cell identifier to be used by the plurality of wireless serving communication units in transmitting broadcast communications across the cluster of communication cells in the second network.

Cellular communication system and method for broadcast communication

A cellular communication system () comprises management logic () having broadcast mode logic () arranged to support a common cell identifier reuse pattern for broadcast transmissions amongst a cluster of communication cells. A plurality of wireless serving communication units is operably coupled to the management logic. At least one wireless communication unit comprises a receiver for receiving a broadcast signal from both a first serving wireless communication unit and a second serving wireless communication unit wherein both the first serving wireless communication unit and second serving wireless communication unit use a common cell identifier () reuse pattern for broadcast transmissions to be used by the at least one wireless communication unit in receiving broadcast communication across the cluster of communication cells. The at least one wireless communication unit further comprises logic arranged to detect the broadcast communication from both the first serving wireless communication unit and second serving wireless communication unit, where the broadcast communication is allocated to the first timeslot () or first sub-frame based on it being more robust to multipath delay due to temporal dispersion of the same broadcast signal from a plurality of wireless serving communication units.

A time division duplex (TDD) cellular communication system () is arranged to support both uplink and downlink communication allocated for unicast time division duplex (TDD) communication that uses a single cell identifier reuse pattern. The TDD cellular communication system () comprises a plurality of wireless serving communication units operably coupled to management logic. The TDD cellular communication system () further comprises management logic () arranged to partition time domain physical resources such that unicast communication using the single cell identifier reuse pattern is supported in a first portion of the time domain physical resource and a broadcast communication using a common cell identifier () reuse pattern for broadcast communications is supported in a second portion of the time domain physical resource.

A cellular communication system () is arranged to support a single cell identifier reuse pattern using a first communication. Management logic () comprises broadcast mode logic () arranged to support a common cell identifier reuse pattern for broadcast transmissions amongst a cluster of communication cells using a second communication. A plurality of wireless serving communication units are operably coupled to the management logic. At least one wireless communication unit comprises logic arranged to support a unicast communication using a first communication cell identifier and logic arranged to support broadcast communication using a common cell identifier () to be used by the wireless communication unit in receiving broadcast communication across the cluster of communication cells.

Channel estimation in a MIMO communications system includes performing a decomposition of an initial channel matrix estimate associated with a first subcarrier of a plurality thereof defined in the channel to identify eigenvectors associated with that subcarrier of the received signal, and defining a first beamforming transformation to be applied to the received signal on the basis of the eigenvectors. For each of the other subcarriers, an additional decomposition is performed in order to determine a further beamforming transformation for each subcarrier. The additional decompositions are carried out incrementally such that information determined in one of said decompositions contributes to a later executed decomposition. Further described is a method of transmitting from a multiple antenna transmitter defining a plurality of subcarriers in space, and time or frequency, comprising the same iterative process. Transmission can be carried out using smoothed beamforming applied in accordance with aspects of the invention.

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Bristol, United Kingdom

Vishakan Ponnampalam