Texas Instruments Corporation

Altair Semiconductor Ltd.

Capacicom Ltd.

Other

Ariel Yagil

Yigal Bitran

Daniel Wajcer

Itay Lusky

Ofir Shalvi

Naftali Sommer

Zvi Reznic

Yosef Bendel

Eli Haim

Ronen Mayrench

Naor Goldman

Dima Feldman

Mati Amit

Ran Senderovitz

Avihay Sadeh

Liran Brecher

Mor Miller

Avihay Sadeh-Shirazi

Nitzan Ron

Amir Peleg

An apparatus for communication includes a transmission chain, an interference suppressor and a reception chain. The transmission chain is configured to transmit a transmitted signal. The interference suppressor is configured to produce suppression signals, by filtering reference signals drawn from the transmission chain. At least one of the reference signals is filtered in a frequency domain. The reception chain is configured to receive a signal distorted by at least an attenuated and delayed replica of the transmitted signal. The transmitted signal and the received signal are (i) synchronized in time and (ii) each includes one or more subcarriers selected from a common subcarrier-resource. The reception chain is further configured to process the received signal up to selected points, to subtract the suppression signals from the received signal at the selected points to produce an interference-suppressed signal, and to recover data carried in the received signal from the interference-suppressed signal.

Synchronized interference suppression in frequency domain

An apparatus includes a transmitter, a receiver and a combining element. The transmitter includes multiple coupling devices coupled to a coaxial network via multiple respective ports, and is configured to transmit multiple transmit signals via the coupling devices, and to receive from the coaxial network via the multiple coupling devices multiple reception signals. The receiver is configured to receive a combined signal of the multiple reception signals, interfered by multiple respective interfering signals that originate from the multiple transmit signals, and to process the combined signal to recover data carried in the reception signals. The combining element, included in at least one of the transmitter and the receiver, is configured to receive the multiple reception signals from the respective couplers, and to generate the combined signal with a suppressed level of the interference signals by setting at least a phase of at least one of the reception signals.

Downstream interference suppression in full-duplex communications

A transceiver includes a transmission chain, a reception chain, an interference suppression module and a processor. The transmission chain transmits a downstream signal to a communication network. The reception chain receives an upstream signal including (i) upstream transmissions originating by client devices, and (ii) an interference signal created by leakage and reflections of the downstream signal. The reception chain includes a configurable switch for connecting or disconnecting the upstream signal. The interference suppression module applies to the downstream signal a filter response function for generating an interference suppression signal to be subtracted from the upstream signal at a selected suppression point. The processor estimates the filter response function by monitoring the upstream signal while toggling the switch to connect and disconnect the upstream signal, and, sets the switch to connect the upstream signal and configures the interference suppression module to apply the filter response function to the downstream signal.

Estimation of interference suppression filters using selective signal switching

A digital synthesis channelizer includes a memory buffer and circuitry. The memory buffer stores samples of N input signals having a sampling rate Fsi. The N input signals are processed, prior to storing in the memory buffer, by an N-point time-frequency transform module. The circuitry includes at least P filters derived from a Low-Pass Filter whose stopband frequency depends on Fsi. The circuitry is configured to set a sampling time according to a predefined output sampling rate Fso=&#x3bb;&#xb7;Fsi, &#x3bb; being a predefined rate-conversion ratio, to select based on the sampling time one or more filters out of the at least P filters, and using the selected one or more filters, to generate, from at least some of the samples in the memory buffer, a filtered and interpolated output sample of an output signal that sums N digitally resampled by &#x3bb; and frequency-shifted versions of the respective N input signals.

Small-footprint digital synthesis channelizer for multiple narrowband frequency-slices

A method includes receiving a signal from a remote transmitter via an electrically-tunable antenna having a tunable element. An adjustment, to be applied to a response of the electrically-tunable antenna, is calculating by analyzing the received signal. The response of the electrically-tunable antenna is adapted by controlling the tunable element responsively to the estimated adjustment.

Passive automatic antenna tuning based on received-signal analysis

A method for communication in a wireless device () includes establishing a first connection with a base station (BS-) of a long-range wireless data network, and a second connection on a Wireless Local Area Network (WLAN). A time interval () is selected in the wireless device for communicating over the second connection. In preparation for the selected time interval, the BS is caused to refrain from scheduling data transmission from the wireless device to the BS over the first connection during the time interval, by reporting to the BS prior to the time interval that no data is pending for transmission from the wireless device. The wireless device communicates over the second connection on the WLAN during the time interval.

LTE/Wi-Fi coexistence

A method for communication includes communicating between one or more first base stations (A) and first wireless communication terminals (A) using a first alternating pattern () of downlink time intervals and uplink time intervals. A time offset is selected between the first alternating pattern and a second alternating pattern (), which is used by one or more second base stations (B) for communicating with second wireless communication terminals (B), so as to minimize impact of interference between the first and second wireless communication terminals. The first base stations are synchronized relative to the second base stations according to the selected time offset.

Mitigation of interference between communication terminals in TD-LTE

A method for communication includes allocating, in a multiple-access communication system () that uses multiple subcarriers, first subcarriers to a first communication terminal for transmitting first data, and second subcarriers to a second communication terminal for transmitting second data. The first communication terminal is assigned to modulate the first data onto at least some of the first subcarriers using a first multi-carrier modulation scheme, to produce a first signal. The second communication terminal is assigned to modulate the second data onto at least some of the second subcarriers using a second multi-carrier modulation scheme, which has a reduced peak-to-average power ratio (PAPR) relative to the first multi-carrier modulation scheme, to produce a second signal. Simultaneous communication is carried out with the first and second communication terminals by simultaneously receiving the first and second signals over the first and second subcarriers.

Low peak-to-average power ratio transmission in frequency-division multiple access systems

A terminal () for use in a wireless network () includes a radio frequency (RF) receiver (), which is configured to receive and downconvert a RF signal. The RF signal includes downlink frames, each downlink frame including at least an allocation zone followed by a data zone. The allocation zone contains an indication of a time allocation in the data zone during which downlink data will be transmitted to the terminal. An analog/digital (A/D) converter () converts the output signal from the RF receiver into a stream of digital samples. A digital processing circuit () processes the digital samples so as to identify the time allocation and to recover the downlink data transmitted during the identified time allocation, while shutting down the RF receiver during at least one interval during the downlink frame that is outside the identified time allocation.

Wireless receiver with intermittent shut-off of RF circuits

A method for communication includes receiving a spatially-multiplexed signal using multiple receivers to produce multiple respective received signals. The spatially-multiplexed signal includes multiple simultaneously-transmitted symbols, which are selected from respective sets of constellation symbols, each constellation symbol representing a respective set of values of a group of data bits. Combinations of the constellation symbols are traversed iteratively. Each combination includes one constellation symbol from each of the sets of the constellation symbols and represents N data bits. The traversed combinations are searched for a combination that matches the received signals. During traversal of the combinations, at least 2N measures of likelihood regarding the values of the data bits represented by each traversed combination are accumulated. The accumulated measures of likelihood are processed to produce soft bit metrics. The values of the data bits carried by the multiple transmitted symbols are reconstructed responsively to the soft bit metrics.

Efficient decoding of spatially-multiplexed signals

A novel and useful baseline wander correction mechanism for use with transformer coupled baseband communication receivers. Parametric estimation of the transformer model is used estimate and cancel the baseline wander effect. A parametric model is used to model the baseline wander impairment created by the transmitter and receiver transformers as a high pass filter having an exponential decay parameter alpha. A correction signal for both the far end and echo signal paths are calculated and summed to generate a total correction signal. The total correction signal is partitioned into an analog correction signal that is applied to the analog portion of the communications receiver and into a digital correction signal that is similarly applied to the analog portion of the communications receiver.

Growing community of inventors

Ein Sarid, Israel

Ariel Yagil