Disclosed is a method of estimating, by a user equipment, a reception delay time of a reference signal, the method including receiving a reference signal from a base station; setting a plurality of summation time intervals within a time interval in which the reference signal is received, and acquiring a plurality of snapshot vectors corresponding to the plurality of summation time intervals; calculating a covariance matrix based on the plurality of snapshot vectors; and estimating a reception delay time of the reference signal based on the covariance matrix.

A method in a wireless receiver for estimating a channel. The method includes receiving a signal comprising a plurality of transmission layers, each layer having at least one reference signal according to a predefined reference signal sequence; determining a window size for performing a sampling operation, wherein the operation is performed in a transformed domain of the received signal; selecting a channel tap length, from a range of channel tap lengths, wherein the selection is based on the window size, a noise mean and a noise variance. The channel estimation is performed from a reference signal sequence for the at least one reference signal and based on samples corresponding to the selected channel tap length.

An aspect of the present disclosure provides a method of a user device in a wireless communication system, the method comprising: receiving, on one bandwidth part (BWP) among multiple BWPs, multiple discovery signals; on the basis of a delay spread value of each of the multiple discovery signals, transmitting, on the one BWP, allocation information of BWPs remaining after excluding the one BWP among the multiple BWPs; and receiving, on the remaining BWPs, multiple sidelink control signals and data signals, wherein it is configured that only an extended CP is to be used on the one BWP, and only a normal CP is to be used on the remaining BWPs. The user device is an autonomous driving vehicle or is included in an autonomous driving vehicle.

A method of positioning using a shortest path based on a synthesized wideband channel estimate is described. In some embodiments, a method is disclosed, comprising: distributing an uplink schedule to a plurality of synchronized nodes; continuously capturing a reference signal across a plurality of carrier frequencies until frequency coverage for the synthetic wide band is achieved; removing frequency offset; calculating a plurality of channel estimates for the captured reference signal; aligning the plurality of channel estimates; combining the plurality of channel estimates to construct a single channel estimate of the synthetic wide band; deriving a shortest delay for the received reference signal; and using the derived shortest delay to estimate a time of arrival and thereby determine an estimated location.

Aspects of disclosure relate to a UE reporting to a gNB time delays and phases of pilot signals received via multiple transmission paths in order for the gNB to pre-equalize a future transmission to the UE. The UE determines a first time delay for receiving a first pilot signal from a gNB via a first path, determines a second time delay for receiving a second pilot signal from the gNB via a second path, and generates a report based on the first time delay and the second time delay. The UE then sends the report to the gNB and receives a multi-TRP signal from the gNB via the first path and the second path, wherein the multi-TRP signal is pre-equalized for transmission based on the report to at least have a same time delay as a shorter one of the first time delay or the second time delay.

An operation method is implemented by a receiver device. The operation method includes following steps: detecting a signal on a transmission line; performing a channel estimation to acquire a length of the transmission line; comparing the length with at least one length threshold value to generate a comparison result; and adjusting a depth of a FIFO process according to the comparison result.

A method and a receiving node for determining a channel window length (l{circumflex over ( )}) for a transformed domain channel estimator, the channel window length (l{circumflex over ( )}) to be applied for a particular reference signal (RS) carrying symbol. At least two subsets (A.sub.1, A.sub.2, . . . ) of received RS carrying symbols are obtained out of a set of RS carrying symbols ({S.sub.1, S.sub.2, . . . }), where the particular RS carrying symbol is included in at least one of the at least two subsets (A.sub.1, A.sub.2, . . . ). A corresponding hypothesis channel window length (l*) is determined for the at least one of the subsets (A.sub.1, A.sub.2, . . . ) based on a set of channel responses. The channel window length (l{circumflex over ( )}) for the particular RS carrying symbol is then determined based on the corresponding hypothesis channel window length (l*).

A method for minimizing a time domain mean square error (MSE) of channel estimation (CE) includes estimating, by a processor, a power delay profile (PDP) from a time domain observation of reference signal (RS) channels; estimating, by the processor, a noise variance of the RS channels; and determining, by the processor, a first arrival path (FAP) value and a delay spread estimation (DSE) value based on the estimated PDP and the estimated noise variance for minimizing the MSE of CE.

A method for minimizing a time domain mean square error (MSE) of channel estimation (CE) includes estimating, by a processor, a power delay profile (PDP) from a time domain observation of reference signal (RS) channels; estimating, by the processor, a noise variance of the RS channels; and determining, by the processor, a first arrival path (FAP) value and a delay spread estimation (DSE) value based on the estimated PDP and the estimated noise variance for minimizing the MSE of CE.

The present invention relates to a method and apparatus for detecting the type of signal propagation, the method comprising: calculating a plurality of similarity values when a location base station in an ultra-wideband location system currently receives a pulse response from a location tag, wherein each of the similarity values represents the degree of similarity between the currently received pulse response and one of a plurality of reference pulse responses, and the plurality of reference pulse responses are pulse responses from at least one location tag that were previously received by the location base station where the type of signal propagation between the location base station and the at least one location tag is a specific type of signal propagation; and determining, based on the plurality of similarity values, a current type of signal propagation between the location base station and the location tag. The method and apparatus can be used to detect the type of signal propagation between the location base station and the location tag in the UWB location system.