Described herein is a system and method for determining one or more data modulation profiles for one or more devices. The system and method described herein may measure signal quality, such as a modulation error ratio (MER), signal-to-noise ratio (SNR), receive power, transmit power, etc. Based on the signal quality, the system may determine one or more data modulation profile(s) (e.g., quadrature amplitude modulation (QAM) profiles) for a subcarrier, a plurality of subcarriers, a device, and/or a grouping of devices.

Phase noise is a limiting factor in high-frequency 5G and 6G communications. Disclosed is a multiplexed amplitude-phase modulation scheme that can provide extremely wide phase noise margins at high frequencies. The transmitter can transmit a wave modulated in amplitude and phase, configured to provide a wide separation of phase states. The receiver, on the other hand, demodulates the message using quadrature amplitude modulation QAM, since that is generally more economical and technically preferred for signal processing. The demodulated message, however, still retains the large phase margins. As a further benefit, the examples illustrate non-square and asymmetric modulation schemes, which can extend the noise margins even further. By modulating with amplitude and phase, but demodulating with orthogonal branch signals, wireless networks can expand into high-frequency bandwidths while retaining high reliability and high throughput, as required for wireless applications of tomorrow.

A method for receiving a signal by integer forcing in a wireless communication system is provided. The method includes receiving one or more signals through a plurality of antennas, filtering the received one or more signals using a forcing matrix, generating codewords by remapping the filtered one or more signals, acquiring a summed codeword by performing a modulo operation on the codewords, decoding the summed codeword, and acquiring original codewords by performing an inversion operation on the decoded summed codeword.

A method of designing a digital filter for example for use in an FBMC/OQAM telecommunications system, with a target overlapping factor and meeting a specified signal to interference ratio is described, whereby a candidate filter design defined by an impulse response, satisfying the Nyquist criterion and having an overlapping factor higher than the target is selected, and the time and frequency coefficients of its impulse response inverted to define a new filter design; and

truncating the impulse response defining said new filter design to the minimum number of coefficients achieving said specified signal to interference ratio.

A transmitter may comprise a symbol mapper circuit and operate in at least two modes. In a first mode, the number of symbols output by the mapper circuit per orthogonal frequency division multiplexing (OFDM) symbol transmitted by said transmitter may be greater than the number of data-carrying subcarriers used to transmit the OFDM symbol. In a second mode, the number of symbols output by said mapper circuit per orthogonal frequency division multiplexing (OFDM) symbol transmitted by said transmitter is less than or equal to the number of data-carrying subcarriers used to transmit said OFDM symbol. The symbols output by the symbol mapper circuit may be N-QAM symbols. While the circuitry operates in the first mode, the symbols output by the mapper may be converted to physical subcarrier values via filtering and decimation prior to being input to an IFFT circuit.

In a receiver of Quadrature Amplitude Modulation (QAM) signal, the received QAM signal is divided into multiple Quadrature Phase Shift Keying (QPSK) symbol streams. A Maximum Likelihood Symbol Estimation (MLSE) is performed on each QPSK symbol stream to recover information bits in the received QAM signal. In one advantageous aspect, complexity of implementation can be reduced by performing MLSE on QPSK signals instead of QAM signals.

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.

This disclosure relates to a 5G or a pre-5G communication system to be provided to support a higher data rate following 4G communication systems such as LTE. A method according to one embodiment of the present invention is a method for attenuating interference of a signal received in a receiver of a filter bank multicarrier (FBMC) system, the method comprising the steps of: separately extracting data and a reference signal in a received FMBC symbol; obtaining a diagonal element channel of a desired symbol through a channel estimation from the extracted reference signal; generating an interference channel matrix of a non-diagonal component of the desired symbol, a diagonal component and a non-diagonal component of an interference symbol using a channel estimated diagonal component; reconfiguring to a banded channel matrix using an interference channel matrix; and attenuating the interference contained in the extracted data using the reconfigured banded channel matrix information and filter information of a transmitter of the filter bank multicarrier system.

A phase spectrum based delay estimating method of tracking channel responses, extracting phase responses from the tracked channel responses, and generating a delay estimate, wherein the delay estimate is based on a slope and intercept estimates of the extracted phase responses with high quality metric to improve delay estimation, and a system thereof.

A system for providing a residential IP network includes a plurality of transceiver circuitries, each associated with a building, for transmitting signals to/from the associated building. An optical network unit transmits and receives signals at a first frequency with an optical network. A remote unit integrated with the optical network unit converts the received signals at the first frequency into a first format that overcome losses caused by penetrating into the interior of the building over a wireless communications link and transmits the signals in the first format using beam forming and beam steering to provide the wireless signals to at least one of the plurality of transceiver circuitries. Each of the plurality of transceiver circuitries further includes first circuitry, located on an exterior of the building, for transmitting and receiving the signals in the first format. A first antenna associated with the first circuitry for transmits the signals in the first format into the interior of the building via a wireless communications link and receives signals from the interior of the building in the first format via the wireless communications link. Second circuitry, located on the interior of the building and communicatively linked with the first circuitry via the wireless communications link, receives and transmits the converted received signals in the first format that counteracts the losses caused by penetrating into the interior of the building from/to the first circuitry. A second antenna associated with the second circuitry transmits the signals in the first format to the exterior of the building via the wireless communications link and receives signals from the exterior of the building in the first format via the wireless communications link.