When transmitting signals from a plurality of base stations (broadcasting stations), the base stations include at least a first base station having a first antenna with a first polarization and a second base station having a second antenna with a second polarization that is different from the first polarization. Then, when the first base station transmits a signal from the first antenna having the first polarization, the second base station transmits the same signal as the first antenna of the first base station from a second antenna having the second polarization, at the same time.

A method for detecting the presence of one or more radioelectric transmitters in an environment, the method being implemented by a device including a computing unit and an antenna array including a plurality of antennas able to carry out acquisitions simultaneously from the environment in the form of acquisition signals during an acquisition time and to receive and to transmit simultaneously the acquisition signals in digital form to the computing unit.

A wireless device, such as an wireless access point, receives signals detected by a plurality of antennas of a wireless device to produce a plurality of antenna-specific receive signals potentially representing a wireless transmission received from each of one or a plurality of devices. A signal processing component of the wireless device, such as a modem, performs several operations on the antenna-specific receive signals, including building a first space-time equalizer to be applied to the plurality of antenna-specific receive signals to recover a transmission from a first device by both equalizing channel effects and canceling out effects associated with transmissions from devices other than the first device, and building a second space-time equalizer to be applied to the plurality of antenna-specific receive signals to recover a transmission from a second device by both equalizing channel effects and canceling out effects associated with transmissions from devices other than the second device.

A method that may include receiving, by multiple antennas of a receiver, received signals that are received with diversity and represent transmitted signals; and processing, by at least one processor of the receiver, the received signals to provide processed signals that are indicative of the transmitted signals; wherein the processing comprises applying a dimension-reducing process. The dimension-reducing process may be channel independent.

A wireless device, such as an wireless access point, receives signals detected by a plurality of antennas of a wireless device to produce a plurality of antenna-specific receive signals potentially representing a wireless transmission received from each of one or a plurality of devices. A signal processing component of the wireless device, such as a modem, performs several operations on the antenna-specific receive signals, including building a first space-time equalizer to be applied to the plurality of antenna-specific receive signals to recover a transmission from a first device by both equalizing channel effects and canceling out effects associated with transmissions from devices other than the first device, and building a second space-time equalizer to be applied to the plurality of antenna-specific receive signals to recover a transmission from a second device by both equalizing channel effects and canceling out effects associated with transmissions from devices other than the second device.

This disclosure provides systems, methods, and apparatuses, including computer programs encoded on computer storage media, for managing high volumes of space-time-streams in Wi-Fi systems. An access point (AP) may transmit packets including long training field (LTF) sections using a number of space-time-streams greater than eight. Mobile stations (STAs) in the system may or may not be capable of processing this number of streams. The AP may modulate an LTF section using a matrix with dimensions smaller than the number of streams by using tone-interleaving or by performing modulation with separate matrices in time and frequency. In some other implementations, the AP may split the antennas for transmission into groups, each group transmitting either different packets in a subset of streams or a same packet in a subset of tones. In further implementations, the AP may combine multiple space-time-streams into a super stream that supports reception at different types of STAs.

When transmitting signals from a plurality of base stations (broadcasting stations), the base stations include at least a first base station having a first antenna with a first polarization and a second base station having a second antenna with a second polarization that is different from the first polarization. Then, when the first base station transmits a signal from the first antenna having the first polarization, the second base station transmits the same signal as the first antenna of the first base station from a second antenna having the second polarization, at the same time.

Embodiments of the invention provide a decoder for decoding a signal received through a transmission channel in a communication system, said signal comprising a vector of information symbols, wherein the decoder comprises: a processing unit (307) configured to determine at least one candidate set of division parameters and to perform a division of said vector of information symbols into a set of sub-vectors in association with each candidate set of division parameters, each pair of sub-vectors being associated with a division metric; a selection unit (309) configured to select one of said candidate sets of division parameters according to a selection criterion depending on said division metric; and a decoding unit (311) configured to determine at least one estimate of each sub-vector associated with said selected set of division parameters by applying a symbol estimation algorithm,
wherein the decoder is configured to determine at least one estimate of the vector of information symbols from said at least one estimate of each sub-vector of information symbols.

Embodiments are directed to a user equipment (UE) that performs MIMO communication on a plurality of Component Carriers (CCs) in accordance with a Carrier Aggregation (CA) scheme with each CC having an associated rank number that indicates a respective number of receive chains for the CC, selects at least one of the plurality of CCs for tuning away from the MIMO communication in order to perform an inter-frequency (IF) Positioning Reference Signal (PRS) measurement, selects, from among a plurality of receive chains allocated to the selected at least one CC, a subset of receive chains that includes less than all of the plurality of receive chains to be tuned away from the MIMO communication to perform the inter-frequency PRS measurement, and tunes the selected subset of receive chains of the selected at least one CC away from the MIMO communication to perform the inter-frequency PRS measurement.

Embodiments are directed to a user equipment (UE) configured to perform MIMO communication on a plurality of Component Carriers (CCs) in accordance with a Carrier Aggregation (CA) scheme with each CC having an associated rank number that indicates a respective number of receive chains for the CC, select at least one of the plurality of CCs for tuning away from the MIMO communication in order to perform an inter-frequency Positioning Reference Signal (PRS) measurement based at least in part upon a per-rank throughput contribution by each of the plurality of CCs, a transmission mode of the selected at least one CC and/or a channel quality of the selected at least one CC, and tune a set of receive chains of the selected at least one CC away from the MIMO communication to perform the inter-frequency PRS measurement.