A Belief Propagation (BP) equalization method and apparatus, a communication device and a storage medium are disclosed. The method may include: splitting a received signal Y.sub.c, a channel estimation H.sub.c and a symbol estimation X.sub.c into real parts and imaginary parts to obtain a received signal matrix Y, a channel estimation matrix H and a symbol estimation matrix X (S101); performing orthogonal triangular (QR) decomposition on the channel estimation matrix H to obtain an equivalent received signal Y.sub.bp, an equivalent channel R and a noise power ?.sup.2 (S102); and performing iteration based on the equivalent received signal Y.sub.bp, the equivalent channel R and the noise power ?.sup.2 to obtain a position probability of per stream symbol (S103).

A reception device includes a transmission-path estimation unit calculating a transmission-path estimation value based on static symbols included in the block signal, and a block signal demodulation unit demodulating the block signal based on the transmission-path estimation value. The transmission-path estimation unit calculates an initial value of the estimation value based on static symbols included in a first block signal to be demodulated, and recalculates a transmission-path estimation value based on a result obtained by the block signal demodulation unit demodulating data symbols included in the first block signal using the initial value and a result of demodulation of data symbols included in a second block signal having been received immediately-previously to the first block signal. The block signal demodulation unit demodulates the first block signal again using the recalculated estimation value.

The present disclosure relates to a 5G or pre-5G communication system to be provided to support a higher data transmission rate beyond the 4G communication system, such as LTE. The present invention provides a method for estimating a downlink channel by a receiver in a wireless communication system, the method comprising: estimating the downlink channel on the basis of a reference signal to recover an information bit, and checking whether the information bit recovery has succeeded; and when the information bit recovery has not succeeded, selecting at least one of the received signals as a virtual reference signal on the basis of the accuracy of the data reconstructed at a related resource location and the correlation between the related resource location and a resource location related to the reference signal, and estimating the downlink channel on the basis of at least one virtual reference signal.

The present disclosure relates to a state feedback decoder based channel estimating method including: calculating a first output bit when an input bit is 0 and a second output bit when an input bit is 1 using convolution encoder state information received from a determining unit; configuring a first virtual pilot and a second virtual pilot through modulation by receiving the first output bit and the second output bit; deinterleaving an i-th (here, i refers to a natural number corresponding to the number of OFDM symbols from 1) OFDM symbol; estimating a first channel and a second channel based on the first virtual pilot and the second virtual pilot using an output value in accordance with the deinterleaving result and calculating a first mean square error (MSE) and a second MSE; and comparing the calculated first MSE and second MSE to determine an input bit having a lower MSE as a reception bit by the determining unit and updating and feedbacking the convolution encoder state information using the determined reception bit.

A receiving device performs, in an equalization processing circuit that performs an equalizing process for a received signal sequence and outputs a sequence to be demodulated, a first transmission-path estimating process of generating a first compensation coefficient indicating a propagation coefficient of a transmission path of a received signal, based on a preamble sequence, a second transmission-path estimating process of generating a second compensation coefficient from a received header-replica sequence generated by performing demodulation and modulation for a header sequence included in a first equalizer-compensated output sequence in which distortion has been compensated based on the first compensation coefficient, a third transmission-path estimating process of generating a third compensation coefficient by synthesizing the first and second compensation coefficients with each other, and a propagation-path compensating process of performing a distortion compensating process for a payload sequence included in the received signal sequence based on the third compensation coefficient.

In an aspect of the present invention, provided is a method for receiving an uplink signal by a base station (BS) in a wireless communication system where a reference signal is not used, including: obtaining information bits by demodulating and decoding a signal of a first user equipment (UE) that is modulated through a differential modulation scheme; estimating a channel between the first UE and the BS using the information bits; and performing successive interference cancellation (SIC) using the signal of the first UE restored through the channel estimation results and the information bits. In this case, the BS may estimate the channel between the first UE and the BS by assuming that an N.sup.th modulation symbol among modulation symbols of the information bits modulated through the differential modulation scheme is fixed to a predetermined constellation point.

In accordance with one or more embodiments, a transmission device includes a receiver configured to receive an interfering signal via an antenna. A controller is configured to generate interference data based on the interfering signal. A communications interface is configured to send the interference data to a network element of a network and further configured to receive an allocation of a plurality of guided electromagnetic wave resource blocks. A transmitter is configured to generate electromagnetic signals conveying data, in accordance with the allocation of the plurality of guided electromagnetic wave resource blocks. A coupler configured to generate guided electromagnetic waves in response to the electromagnetic signals, wherein the guided electromagnetic waves propagate, without requiring an electrical return path, along a surface of a transmission medium of a distributed antenna system.

A switch interface board may include a first serializer/deserializer to communicate with a first group of packet processing components of a first chassis via a first port. The first chassis may house the switch interface board and the first group of packet processing components. The switch interface board may include a second serializer/deserializer to communicate with a second switch interface board of the first chassis via a second port. The second switch interface board may be connected to a second group of packet processing components of the first chassis. The second group of packet processing components may be different from the first group of packet processing components. The switch interface board may include a third port to communicate with a third switch interface board of a second chassis or a switching device of a cross-connect chassis.

A method for channel estimation in LTE, the method comprising decoding a received LTE signal comprising a message, and when a CRC of the decoder indicates successful decoding of a subframe, estimating the content of the message transmitted to the decoder, de-rotating the received LTE signal based on the estimated content of the message transmitted to the decoder to calculate pseudo pilot signals for all resource elements on which the corresponding physical downlink shared channel PDSCH is mapped.

A method by which a first wireless device tracks a channel in a wireless AV system, according to one embodiment of the present invention, comprises the steps of: receiving a radio signal including a first part related to a preamble and a second part related to a data block and a GI; estimating an initial channel on the basis of the preamble; estimating a residual channel on the basis of the GI, wherein a reconstruction sequence reconstructed on the basis of a Golay sequence having a predetermined length is applied to the GI; and updating a channel on the basis of first information acquired on the basis of the initial channel estimation and second information acquired on the basis of the residual channel estimation.