An alternative method of data communications using orthogonal time frequency shifting (OTFS) wireless waveforms configured so as to transmit data in a manner that is relatively insensitive to communications channel distortions and frequency shifts. In contrast to prior methods taught by applicant, the present disclosure teaches an alternative modulation scheme that maps data symbols intended for data transmission onto a symplectic-like 2D Fourier transform which operates on a form of the original data symbols. This 2D Fourier transform in turn is passed through a filter bank of narrow band filters, and the output in turn used to modulate transmitted waveforms according to various time slices until the entire 2D Fourier transform has been transmitted. At the receiver, and inverse of this process can be used to both characterize the data channel and correct the received signals for channel distortions, thus receiving a clear form of the original data symbols.

The invention relates to a MIMO-FBMC transmitter/receiver with linear precoding implemented in the frequency domain. In one embodiment, at the transmitter the linear precoding is performed (525.sub.1, . . . ,525.sub.KN) after filtering and spectral spreading, before the IFFT and combination of FBMC symbols in the time domain, such that the precoding does not introduce interference between data streams. In a second embodiment the linear precoding may be combined with the beamforming at transmission or at reception so as to spatially separate the data streams.

Disclosed is an underwater acoustic communication system based on a filter bank joint sub-carrier multidimensional index modulation and a method thereof. The system includes a transmitting terminal and a receiving terminal, the method is: conducting a joint index modulation at the transmitting terminal, firstly selecting an activated prototype pulse index by using a part of bits of a FBMC symbol, grouping the remaining transmitted information bits and all sub-carriers; using a part of the bits in each group to select the activated sub-carrier index, modulating the remaining bits to the activated sub-carriers by a constellation symbol mapping, forming a transmission signal after a filter bank modulation; and demodulating three parts of transmitted bits at a receiving terminal after an action of underwater acoustic channel, and recovering the original data bits by combining each part of decoding results.

An electronic device in a wireless communications system, the wireless communications system, and a method. The electronic device includes: a reception unit, configured to receive a signal from another electronic device in a wireless communications system; an analysis filtering unit, configured to set an analysis filter group according to a parameter of a non-perfect reconstruction filter group, decompose, by using the analysis filter group, signals received by the reception unit into multiple paths of sub-band signals and perform analysis filtering; and an interference cancellation unit, configured to, for each path of sub-band signals among multiple paths of sub-band signals, cancel inter-band interference in each path of sub-band signals according to each path of sub-band signals and neighboring sub-band signals thereof.

An FBMC transmission/reception system wherein a phase pre-compensation and an amplitude pre-compensation are done on a block of modulation symbols. The symbol block thus compensated is segmented into a number M of sub-blocks equal to the number of carriers of an FBMC modulator. The sub-blocks are divided into vectors with size N/2 and padded with isolation zeroes to form padded vectors with size N. Each of these padded M is processed by an IFFT to give time sequences to which cyclic prefixes and suffixes are added. The resulting cyclic sequences are then input to the M input channels of the FBMC modulator. The reception symbols can be recovered at the receiver by a simple FFT with size NM/2.

The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). A packet transmission method and apparatus for use in a wireless communication system and, in particular, for transmitting packets in a filter bank-based multicarrier wireless communication system. The packet transmission method for use in a wireless communication system based on Filter Bank-based Multi-Carrier (FBMC) includes generating an Offset Quadrature Amplitude Modulation (OQAM) symbol by extracting a transmission data period from data blocks obtained by repeating a transmission data as many times as an overlapping factor, performing Inverse Fast Fourier Transform (IFFT) on the OQAM symbol, shifting, when the overlapping factor is an even number, the IFFT-ed symbol cyclically, filtering the cyclically shifted symbol with a shortened compensation filter, and transmitting the filtered symbol in an overlapped OQAM signal.

A system and method for orthogonal time frequency space communication and waveform generation. The method includes receiving a plurality of information symbols and encoding an NM array containing the plurality of information symbols into a two-dimensional array of modulation symbols by spreading each of the plurality of information symbols with respect to both time and frequency. The two-dimensional array of modulation symbols is then transmitted using M mutually orthogonal waveforms included within M frequency sub-bands.

A method of reception of signals transmitted by a FBMC transmitter using a block Alamouti coding. After demodulation in a base band, the received signal is sampled, with the sample blocks undergoing a sliding FFT before being de-multiplexed towards a first path during a first use of the channel and a second path during a second use of the channel. The vectors received on the first path are multiplied by a first and a second transfer matrix, conjugated to provide first and second vectors. The vectors received on a second path undergo time-reversal and complex conjugation and, if appropriate, multiplication by an imaginary factor, depending on the size of the blocks. The vectors thus obtained are multiplied by first and second transfer matrices to provide third and fourth vectors. The first and fourth (second and third vectors) are then combined and the combined vector is filtered and spectrally de-spread to give an estimate of the block transmitted by the first (second) antenna of the transmitter during the first use of the channel.

Disclosed is a 5G or pre-5G communication system to be provided for supporting a data transfer rate higher than that of a 4G communication system, such as LTE, and subsequent systems. The present invention relates to a method for transmitting and receiving a QAM signal in a filter bank-based multicarrier communication system, and an apparatus therefor. Particularly, the present invention provides an efficient transmission and reception method and apparatus capable of obtaining high performance in the transmission of a QAM signal without intrinsic interference in a multi-path delay channel environment in a filter bank-based multicarrier communication system. Accordingly, the present invention relates to a transmission method in a filter bank-based multicarrier (FBMC) communication system, and an apparatus therefor, the method comprising the steps of: spreading each of two QAM signals divided into a plurality of groups to a plurality of signals on a frequency axis; intersecting at least one signal, which is overlapped with a spread signal of an adjacent QAM signal among the plurality of spread signals, with the spread signal of the adjacent QAM signal; filtering, by each of the plurality of groups, the plurality of spread signals of which at least one signal has been intersected; and transmitting the plurality of filtered spread signals by being overlapped on a time axis.

A system and method for orthogonal time frequency space communication and waveform generation. The method includes receiving a plurality of information symbols and encoding an NM array containing the plurality of information symbols into a two-dimensional array of modulation symbols by spreading each of the plurality of information symbols with respect to both time and frequency. The two-dimensional array of modulation symbols is then transmitted using M mutually orthogonal waveforms included within M frequency sub-bands.