Kabushiki Kaisha Toshiba

Justin Coon

Yue Wang

Magnus Stig Torsten Sandell

Mohammud Zubeir Bocus

Gillian Huang

Hachem Yassine

Rafael Arcangel Cepeda Lopez

Steve Carl Jamieson Parker

Sema Dumanli Oktar

Lingfeng Wang

There is provided a memory device comprising a plurality of memory cells and a controller configured to receive data to be stored in a set of memory cells and map a first portion of the data to a selection of memory cells to be programmed from the set of memory cells, wherein the number of cells to be programmed k is less than number of cells in the set n. The controller is further configured to map a second portion of the data to a plurality of voltage levels to be programmed into the memory cells to be programmed and store the first and second portions of the data in the set of memory cells by programming each memory cell of the selection of memory cells to be programmed to a respective voltage level of the plurality of voltage levels.

Cell location programming for storage systems

MIMO UWB Communications apparatus is configured to send out a channel estimation sequence comprising a plurality of sequentially transmitted symbols in accordance with a first band hopping sequence, sent from one antenna of the apparatus, while another antenna is transmitting another sequence of channel estimation symbols in accordance with another, complementary band hopping sequence. A legacy device will be capable of synchronizing with the channel estimation symbols sent in accordance with the first band hopping sequence, while a MIMO receiver will be able to determine channel estimates for all MIMO channels on the basis of the combined channel estimation transmissions.

Wireless communications apparatus

The embodiments relate to a wireless communications apparatus configured to operate as one of a source node, a relay node or a destination node in a network comprising a plurality of source nodes, relay nodes and destination nodes configured to support dual-hop communication using one of said relay nodes to intercede between one of said source nodes and one of said destination nodes, and a method for selecting a relay node. The wireless apparatus is configured to collect channel characteristics between the intended source node and each relay node, and between each relay node and the intended destination node, and select a relay node for relaying a signal emitted by the intended source node by determining a mode of operation for performing the selection on the basis of collected channel characteristics. The wireless communication apparatus is further configured to change the mode of operation to a different one if the channel characteristics change. The mode of operation of performing the relay node selection is one of a first mode and a second mode. In the first mode; the relay node is selected on the basis of said channel characteristics between the intended source node and each relay node and in the second mode; the relay is selected on the basis of said channel characteristics between each relay node and the intended destination node.

Wireless communications apparatus, a method and a communication system for performing relay selection

According to one embodiment, antenna allocation or selection in a multi-antenna wireless communications device can be performed at a receiver or an emitter of a wireless communications signal. Selection takes place on the basis of antenna and frequency. Antenna selection in a disclosed embodiment involves a combination of bulk and per tone antenna selection.

Wireless communications apparatus and method

The disclosure concerns encoding of information, such as content information for streaming, in a scalable manner. That is, a base layer of encoded content can be supplemented by one or more enhancement layers as channel capacity allows. Definition of bounds for the base layer and the one or more enhancement layers is governed by long-term channel information, while selection of layers for transmission at a particular time is governed by short-term, or instantaneous, channel state considerations.

Rate optimization for scalable video transmission

Channel activity and subsequent access is determined by antenna selection. A sensing period is allocated into slots, dependent on the number of available antennas. For each slot, a distinct set of antennas is used for sensing for channel activity. Results of channel activity measurements for the slots are combined to form a channel activity report.

Radio apparatus and method of operating the same

A method of relaying a signal in a wireless communications network including a plurality of wireless devices is performed by at least one of said wireless devices to relay a signal in a communication path between one of said plurality of wireless devices and another one of said wireless devices, wherein said at least one of said wireless devices includes a power amplifier for amplifying said signal, the method including receiving a signal from said one of said plurality of wireless devices, determining a peak-to-average power ratio of said received signal under a plurality of predetermined relay modes, determining a back-off value associated with said power amplifier, selecting a mode of relaying said signal from said plurality of predetermined relay modes based on said determined peak-to-average power ratio and said determined back-off value, and transmitting said signal to said another one of said plurality of wireless devices using said selected mode.

Wireless communications method and apparatus

A heterogeneous arrangement of encoder and precoder are provided in a multi-hop communications network. The net effect of the encoder and precoder is to present, to a destination node, a quasi-orthogonal space time block coded transmission.

Method and apparatus for coding a signal in a relay network

A method of relaying a signal in a wireless communications network comprising a plurality of wireless devices, the method being performed by at least one of said wireless devices to relay a signal in a communication path between one of said plurality of wireless devices and another one of said wireless devices, the method comprising receiving a signal from said one of said plurality of wireless devices, determining channel statistical information relating to a part or the whole of said wireless communications network, selecting a mode of relaying said signal from a plurality of predetermined relay modes based on said determined channel statistical information, such that the outage probability for said communication path satisfy a predetermined condition, and transmitting said signal to said another one of said plurality of wireless devices using said selected mode.

Wireless communications methods and apparatus

In one embodiment, a method, in a wireless network, of transmitting a sequence of bits of information from an array of antennas, the array of antennas comprising a plurality of antennas, each antenna of the plurality of antennas having a plurality of feed points, comprises selecting an antenna and at least one feed point of the plurality of feed points for the selected antenna from a plurality of combinations of antenna and at least one feed point to indicate at least part of the sequence of bits; and transmitting a signal from the selected antenna by driving the selected at least one feed point.

Wireless communication methods and apparatus

According to one embodiment there is provided a wireless communication device comprising a plurality of antennas and operable to transmit data on a plurality of subcarriers from one or more of said plurality of antennas over a communication channel, the device comprising a receiver configured to receive signals via each of said plurality of antennas, a processor configured to determine the number of subcarriers that can be allocated to one or more of said plurality of antennas for data transmission on the basis of received signal metrics associated with said received signals, and an antenna selector configured to select one or more of said plurality of antennas for transmitting data on said plurality of subcarriers based on said determination.

Method and apparatus for antenna selection in wireless communications systems

A method of shaping signals intended for transmission via at least one antenna, each signal having a respective frequency spectrum and being for transmission via a respective antenna, comprises selecting at least one interference-reducing signal, each interference-reducing signal being such as to modify the signal frequency spectrum for the antenna or a respective one of the antennas to include a respective frequency notch at an interference band, and modifying the frequency spectra with the selected interference-reducing signal or signals, wherein the selection is subject to a constraint on at least one characteristic of the spectra as modified

Interference avoidance

A MMSE equaliser taking into account delays in the reception of signals from plural users. Time delays in reception of signals from plural users may be known or can be measured or estimated and can be used to for the basis for the operation of the equaliser. A low computational complexity version of the equaliser and a regularized equalizer with further reduced complexity for asynchronous reception are also disclosed.

MMSE equaliser

A block of information is processed before transmission thereof in a block transmission based communication. This comprises inserting a cyclic prefix and a cyclic suffix into the block of information before applying a time reversal based prefilter prior to transmission to the data after cyclic prefix and cyclic suffix insertion, the prefilter being configured on the basis of knowledge of the condition of the channel over which communication is to be effected. Then, at the receiver, a removal operation is operable to remove the effect of cyclic prefix and suffix insertion, leaving a circulant shifted version of the original block. This can be decoded using a diagonal matrix containing frequency domain channel coefficients on its diagonal entries after FFT. For systems with more than two transmit antennas, this facilities the use of full rate OSTBC, regardless of whether real or complex signaling is transmitted.

Method of operating a block transmission based communication apparatus

Allocation of subcarriers of a wireless communications channel to antennas for transmission of said subcarriers from a multi-antenna transmitter, comprises selecting, for each subcarrier, the antenna with the most effective transmission performance against a predetermined performance criterion; and determining if subcarriers are evenly distributed amongst said antennas. If even distribution does not arise, then a reallocation sequence is performed. This comprises identifying, for an antenna having excessive subcarriers allocated thereto, the subcarriers allocated thereto and reallocating one of said subcarriers as required, said reallocated subcarrier being selected for reallocation on the basis of its impact on transmission performance.

Growing community of inventors

Bristol, United Kingdom

Justin Coon