A method of transmitting, by a transmitting device, an orthogonal frequency division multiplexing (OFDM) signal in a wireless communication system, the method including: generating, by a digital module of the transmitting device, a frequency-shifted OFDM baseband signal by performing frequency up-shift of a first signal by a difference between a carrier frequency and a first frequency , wherein the first frequency is, among frequencies corresponding to integer multiples of 128; closest to the carrier frequency , and wherein is an OFDM subcarrier spacing; up-converting, by an analog oscillator of the transmitting device, the frequency-shifted OFDM baseband signal by the first frequency to generate an OFDM symbol signal at the carrier frequency fo; and transmitting the OFDM symbol signal at the carrier frequency .

Disclosed are apparatuses for a communication device. An apparatus for a communication device includes control circuitry configured to use circular convolution for pulse shape filtering of a block of data symbols of a single carrier waveform to generate a block-wise single carrier (BWSC) symbol. The apparatus is also configured to insert one of a data-based cyclic prefix or a data-based cyclic postfix into the BWSC symbol one of before the pulse shape filtering or after the pulse shape filtering. An apparatus for a communication device includes control circuitry configured to remove one or more of a cyclic prefix or a cyclic postfix from a received BWSC symbol, and use circular convolution to demodulate the received BWSC symbol.

Cyclic prefix based OFDM (CP-OFDM) signals can be filtered using a digital filter whose filter length exceeds the length of a cyclic prefix in CP-OFDM symbols of the signal. In one example, the duration of the filtered CP-OFDM symbol may be expressed by the following equation: M=N+L1, where M is the duration of the filtered CP-OFDM signal, N is a duration of the CP-OFDM signal, and L is the filter length of the digital filter. Digitally filtering the CP-OFDM signal may include convolving a filtering signal with the CP-OFDM signal. The digital filter may include a finite impulse response (FIR) filter or an infinite impulse response (IIR) filter. In some embodiments, a different digital filter may be applied to each sub-band of the CP-OFDM signal.

Disclosed are a roll-off period detection method, a symbol starting point detection method, a fractional frequency offset estimating method, and an OFDM downstream system using the same. A method of detecting a roll-off period in an OFDM downstream system according to an embodiment of the present disclosure may include: generating a temporary roll-off period by applying a windowing function to a signal having a preset length; and detecting a roll-off period based on any one of a cross correlation and a sum of differences between a detection target signal included in a range of two OFDM symbol signals based on a detection starting point, and the temporary roll-off period.

A method of wireless communication by a user equipment (UE) includes receiving, from a network, a capability request including a frequency band filter. The method further includes retrieving, from a server, a prioritized list of frequency band combinations based on a location of the UE. The method still further includes transmitting, to the network, the prioritized list adjusted based on the frequency band filter, in response to the capability request. A method of wireless communication by a network device includes receiving, from a UE, a request for a list of frequency band combinations based on a location of the UE. The method further includes transmitting, to the UE, a prioritized list of frequency band combinations for the location of the UE. The prioritized list is based on a selected network configured frequency band combination associated with the location of the UE.

A method of transmitting, by a transmitting device, an orthogonal frequency division multiplexing (OFDM) signal in a wireless communication system, the method including: generating, by a digital module of the transmitting device, a frequency-shifted OFDM baseband signal by performing frequency up-shift of a first signal by a difference between a carrier frequency f.sub.0 and a first frequency f.sub.base, wherein the first frequency f.sub.base is among frequencies corresponding to integer multiples of 128?f closest to the carrier frequency f.sub.0, and wherein ?f is an OFDM subcarrier spacing; up-converting, by an analog oscillator of the transmitting device, the frequency-shifted OFDM baseband signal by the first frequency f.sub.base to generate an OFDM symbol signal at the carrier frequency f.sub.0; and transmitting the OFDM symbol signal at the carrier frequency f.sub.0.

According to a first aspect, examples provide a method of operating a first communication node (CN) wherein the first CN is configurable for transmitting, to a second CN on a radio channel, orthogonal frequency-division multiplexing (OFDM) symbols via a first propagation path and a second propagation path, wherein each OFDM symbol comprises a prefix, in particular a cyclic prefix, wherein transmitting the OFDM symbols via the first propagation path comprises transmitting the OFDM symbols to the second CN via a coverage enhancing device, wherein the method comprises providing, to the CED, a message indicative of a delay which is to be applied, by the CED, to incident signals, wherein the first CN selects the delay which is to be applied, by the CED, to the incident signals, to result in an arrival, at the second CN, of a first signal portion transmitted via the first propagation path of a first OFDM symbol being aligned with an arrival, at the second CN, of a second signal portion transmitted via the second propagation path of a second OFDM symbol. Further, a method of operating a second CN as well as a first CN and a second CN are provided.

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.

Various disclosed embodiments include methods and systems for communication in a wireless communication system. A method comprises receiving a signal corresponding to a plurality of modulated signals, each of the plurality of modulated signals corresponding to a unique electronic device. The method comprises filtering the received signal with a plurality of filters, each of which is matched to a corresponding filter in a respective electronic device to obtain a filtered signal for the respective electronic device. The method comprises performing a fast Fourier transform (FFT) operation on the filtered signal to obtain demodulated data corresponding to the respective electronic device.

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.