A device comprises a memory that stores instructions executed by one or more processors to obtain a plurality of received signals transmitted by a user equipment from a plurality of antenna elements in a cellular network. A plurality of complex channel values are calculated in an angle domain for a horizontal arrival angle and a vertical arrival angle per a received ray in a plurality of received rays in response to the plurality of received signals. A frequency-offset estimation is calculated and applied to the plurality of complex channel values. The plurality of offset complex channel values are transformed to a plurality of channel values in a time domain. A time-offset estimation is calculated and applied to the plurality of channel values. An expected value of the plurality of channel values is obtained to obtain a power angle delay profile for the geographical location of the user equipment.

A user station for a bus system and a method for the wideband communication in a bus system are provided. The user station includes a communications-control unit for preparing or reading at least one message for/from at least one further user station of the bus system, in which an exclusive, collision-free access of a user station to a bus line of the bus system is ensured at least intermittently; the communications-control unit is designed to prepare channel-status information according to a time sequence for the transmission specified in the bus system for the user station so that the user station does not have to send the channel-state information in each message, and the channel-status information includes information for ascertaining the channel characteristic between the user station and the further user station of the bus system to which the message is to be sent.

An OFDM system generates a channel estimate in the time domain for use in either a frequency domain equalizer or in a time domain equalizer. Preferably channel estimation is accomplished in the time domain using a locally generated reference signal. The channel estimator generates an initial estimate from a cross correlation between the time domain reference signal and an input signal input to the receiver and generates at least one successive channel estimate. Preferably the successive channel estimate is determined by vector addition (or subtraction) to the initial channel estimate. The at least one successive channel estimate reduces the minimum mean square error of the estimate with respect to a received signal.

A method for use in a wireless communication system comprising a transmitter and a receiver, the method comprising receiving, in the receiver, data comprising a plurality of channel-distorted synchronization codes and plurality of channel-distorted cipher codes, generating a receiver cipher sequence at the receiver, the receiver cipher sequence comprising a plurality of receiver cipher codes, analysing the received data to identify correlations between the plurality of channel-distorted cipher codes in the received data and the plurality of receiver cipher codes, accumulating the identified correlations as accumulator data in an accumulator, identifying one or more peaks in the accumulator data, identifying a first correlation peak in the accumulator data that meets one or more criteria and using the first correlation peak to identify the first path of a data packet from the transmitter.

There are disclosed techniques (e.g., apparatus, methods) for estimating an impulse response of a linear system.

An apparatus is configured to generate a transmit signal on the basis of a first sequence. The apparatus is configured to obtain a receive signal and to multiply the receive signal with a second sequence, to obtain a modified receive signal, wherein the second sequence is different from the first sequence. The apparatus is configured to analog-to-digital, ADC, convert an integration result in order to obtain a sample value, the integration result being based on an integration of the modified receive signal over a period of time. The apparatus is configured to obtain an estimate of the impulse response on the basis of a plurality of sample values.

Embodiments include apparatuses and methods of identifying line of sight, LOS, and non-line of sight, NLOS, conditions in a multipath channel of a vehicular communication system. It is proposed to equip the receiving node with a dual antenna receiver. Then the proposed solution uses the first cluster of multipath components of channel estimates measured on the two antennas to derive the LOS/NLOS channel conditions based on hypothesis testing.

This application discloses a channel estimation method and apparatus. When time-domain channel estimation is performed on a first slot, the first slot and at least one second slot are first determined. The first slot and each second slot form continuous slots. Then, a first signal corresponding to the first slot and a second signal corresponding to each second slot are obtained, and a time-domain channel estimate for the first slot is determined based on the first signal and each second signal. In embodiments of this application, when a time-domain channel estimate for a specific slot is determined, time-domain channel estimation is performed by using time-domain correlation of channels in combination with signals of a plurality of slots, so as to obtain a more accurate channel estimation result, thereby improving baseband demodulation performance.

Methods, systems, and devices for wireless communications are described. A first device (e.g., user equipment (UE), base station) may determine a condition of a channel between the first device and a second device (e.g., UE, base station). The first device may apply pre-equalization to the signal based on one or more pre-equalization parameters. The one or more pre-equalization parameters may be based on the condition of the channel. The first device may transmit, to the second device, or a third device (e.g., UE, base station), or both, a report indicating the one or more pre-equalization parameters associated with the pre-equalized signal. The first device may transmit, to the second device, the pre-equalized signal over the channel. The second device may decode the pre-equalized signal based on the report. The third device may receive the pre-equalized signal and perform interference cancelation procedures to the pre-equalized signal based on the report.

The present disclosure is directed to timestamp detection using a cable modem and to a control apparatus, control device and control method for detecting time stamps in various signals such as orthogonal frequency division multiplexing (OFDM) signals. The control apparatus comprising processing circuitry being configured to obtain information a channel frequency response of the multi-path channel, the channel frequency response being based on a signal comprising a sequence of symbols. The processing circuitry is configured to transform the channel frequency response into a channel impulse response. The processing circuitry is configured to identify a peak in the channel impulse response. The processing circuitry is configured to determine a timestamp offset time between the peak in the channel impulse response and a trigger time indicative of a beginning of a symbol in the signal. The processing circuitry is configured to synchronize the device clock based on the timestamp offset time.

A wireless communication device includes an estimation observation unit that observes a channel condition by estimating a tendency of a long delay wave and a channel fluctuation from a received signal in which a training signal is added to a data frame, a first equalizer that compensates for the received signal, a second equalizer that compensates for the received signal with a property of having a higher long delay wave tolerance and a lower channel fluctuation tolerance than the first equalizer, and a control unit that performs control which switches such that the first equalizer or the second equalizer performs compensation for the received signal, on the basis of the channel condition observed by the estimation observation unit.