A system and method for adaptively utilizing transmitter windowing, receiver windowing and alignment signals for minimizing interference and maximizing capacity and energy efficiency based upon the received power ratios of links in adjacent bands of a cellular communication network.

A system and method for adaptively utilizing transmitter windowing, receiver windowing and alignment signals for minimizing interference and maximizing capacity and energy efficiency based upon the received power ratios of links in adjacent bands of a cellular communication network.

A method and a device for transmitting control information to be used in a terminal are provided. Specifically, an asynchronous level of a terminal supporting an asynchronous transmission mode is measured by using a signal received from the terminal. It is determined whether a measured value of the asynchronous level exceeds a threshold value, and if the asynchronous level is exceeded, a filter length and a CP length, which are to be used in the terminal, are changed. Information on the changed filter length and CP length is transmitted to the terminal. A sum of the filter length and the CP length is fixed, a characteristic of out-of-band emission improves when the filter becomes long in length, and interference occurring due to a multi-path delay can be prevented when the CP length becomes long.

Embodiments of this application provide a signal transmission method and apparatus, and the method includes: filtering a first time domain orthogonal frequency division multiplexing (OFDM) signal at each of M spatial transmission layers, where M is an integer greater than or equal to 1; performing spatial precoding on the filtered first time domain OFDM signal at each of the M spatial transmission layers, and mapping the filtered first time domain OFDM signal at each of the M spatial transmission layers to each of N.sub.t transmit antenna ports, where N.sub.t is an integer greater than or equal to M; and superposing and transmitting the first time domain OFDM signals that are at the M spatial transmission layers and that are mapped to all the N.sub.t transmit antenna ports.

An OFDM modulator including a predistortion module configured to receive the N.sub.c consecutive data carriers and configured to compensate for distortion subsequently introduced by a polyphase filter bank connectable to the output of the OFDM modulator, a transformation module configured to apply a discrete inverse Fourier transform of constant size N.sub.IDFT independently of the numbering and transmission band used by the OFDM transmitter including the OFDM modulator, a filling module, the input of which is connected to the output of the predistortion module, and the output of which is connected to the input of the transformation module, and configured to insert (N.sub.IDFT?N.sub.c) null carriers in succession to the N.sub.c consecutive data carriers independently of the parity of the index i associated with the OFDM modulator.

A method for phase tracking reference signal (PT-RS) signals transmission includes receiving, by a user equipment (UE) from a base station (BS), one or more messages comprising uplink PT-RS configuration parameters and transmitting, by the UE to the BS, PT-RS signals via radio resources of a physical uplink shared channel (PUSCH). The transmitting is based on: the uplink PT-RS configuration parameters, a PT-RS sequence generation process for generating a PT-RS sequence, wherein the PT-RS sequence is based, on a, chirp signal with a time-varying frequency according to a chirp factor and an PT-RS mapping process for mapping the generated PT-RS sequence to the radio resources of the PUSCH.

Different filtered-orthogonal frequency division multiplexing (f-OFDM) frame formats may be used to achieve the spectrum flexibility. F-OFDM waveforms are generated by applying a pulse shaping digital filter to an orthogonal frequency division multiplexed (OFDM) signal. Different frame formats may be used to carry different traffic types as well as to adapt to characteristics of the channel, transmitter, receiver, or serving cell. The different frame formats may utilize different sub-carrier (SC) spacings and/or cyclic prefix (CP) lengths. In some embodiments, the different frame formats also utilize different symbol durations and/or transmission time interval (TTI) lengths.

The present application relates to a filtering scheme with low complexity. The method includes: dividing an orthogonal frequency division multiplexing (OFDM) signal into a first sideband signal, a first signal, and a second sideband signal; sampling the first sideband signal by using a first sampling rate; sampling the first signal by using a second sampling rate; sampling the second sideband signal by using a third sampling rate; and separately performing filtering processing of a third spectral mask, upsampling processing, and digital frequency conversion processing to generate a first filtered-OFDM (f-OFDM) signal, a second f-OFDM signal and a third f-OFDM signal; and superposing the first f-OFDM signal, the second f-OFDM signal, and the third f-OFDM signal to obtain an f-OFDM signal, where the first sampling rate and the third sampling rate are both less than the second sampling rate.

The disclosure relates to a radio transceiving device (210, 220), comprising: a modulation unit (211, 221), configured to modulate transmit data (215, 225) onto a time-frequency resource (219, 229) based on a transmit waveform (217, 227), in particular a transmit pulse, a transmit window or a transmit filter; a demodulation unit (212, 222), configured to demodulate receive data (216, 226) from the time-frequency resource (219, 229) based on a receive waveform (218, 228), in particular a receive pulse, a receive window or a receive filter, wherein the transmit data (215, 225) and the receive data (216, 226) are arranged on the time-frequency resource (219, 229), in particular in a time-division duplexing (TDD) manner; and a waveform adaptation unit (213, 223) configured to adapt at least one of the transmit waveform (217, 227) and the receive waveform (218, 228) based on a set of distinct transmit and receive waveforms (214, 224).

Method disclosed is applied to an OFDM wireless transmission system which includes at least two OFDM symbols, and includes: adding a zero power padding ZP to a tail end of each of the at least two OFDM symbols; adding data of N.sub.w consecutive points at one end of a first OFDM symbol of the at least two OFDM symbols to the ZP at the other end of the first OFDM symbol, so that the data of the N.sub.w points is a prefix and/or a suffix of the first OFDM symbol, where the first OFDM symbol includes data of N points, N>N.sub.w; and performing point multiplication processing with symmetric time domain window function on the data of the N.sub.w points at the two ends of the first OFDM symbol to which the prefix and/or the suffix is added, so that a sum of point coefficients corresponding to the symmetric time domain window function is 1.