An orthogonal frequency division multiplexing (OFDM) transmission system is provided which includes a data processing unit which generates a transmission signal using a plurality of tones including a reserved tone, a storage unit which stores Peak Reduction Kernel information according to the type of data symbol, and a compensation unit which retrieves the Peak Reduction Kernel information according to the type of data symbol from the storage unit and causes the retrieved information to be carried by the reserved tone included in the transmission signal. Therefore, a Peak-to-Average Power Ratio (PAPR) can be efficiently compensated.

Disclosed herein is a broadcast signal transmitter. The broadcast signal transmitter according to an embodiment of the present invention includes an input formatting module configured to perform baseband formatting and to output at least one Physical Layer Pipe (PLP) data, a BICM module configured to perform error-correction processing on the PLP data, a framing and interleaving module configured to interleave the PLP data and to generate a signal frame, and a waveform generation module configured to insert a preamble into the signal frame and to generate a broadcast signal by OFDM-modulate the signal frame.

Disclosed herein is a broadcast signal receiver. The broadcast signal receiver according to an embodiment of the present invention includes a synchronization and demodulation module configured to perform detection and OFDM demodulation on a received broadcast signal, a frame parsing and deinterleaving module configured to parse and deinterleave the signal frame of the broadcast signal, a demapping and decoding module configured to convert the data of at least one Physical Layer Pipe (PLP) of the broadcast signal into a bit domain and to FEC-decode the PLP data, and an output processing module configured to receive the data of the at least one PLP and to output the received data in a data stream form.

One or more devices, systems, and/or methods are provided. In an example of the techniques presented herein, a receiver has a receiver front end configured to receive time domain data in natural order, a fast Fourier transform module configured to generate frequency domain data in digit reversed order based on the time domain data, a demodulator configured to generate first demodulated data in digit reversed order based on the frequency domain data, and a de-interleaver configured to perform a reordering permutation on the first demodulated data to generate second demodulated data in natural order.

Methods and apparatus for monitoring wideband GHz spectrum for wireless communication, and sensing and decoding respective frequency components of a time-varying signal corresponding to the monitored spectrum. Concepts relating to sparse Fast Fourier Transform (sFFT) techniques facilitate identification of one or more frequency components of a sparsely occupied spectrum by sub-sampling the signal corresponding to the monitored spectrum at a sampling rate below the Nyquist criterion. The disclosed methods and apparatus may be implemented using conventional relatively low-power wireless receivers and using off-the-shelf relatively inexpensive low-speed and low-power analog-to-digital converters (ADCs) typically employed in WiFi devices or cellular phones, in tandem with unique processing techniques based on sFFTs and sub-Nyquist criterion sampling, and have demonstrated efficacy even in scenarios where the monitored spectrum is not sparse.

A system and method for 5G new radio (NR) low-density low density parity check (LDPC) decoding comprising performing a Fast Fourier Transform using a Fast Fourier Transform algorithm. The system and method determines if a reference sequence is present and performing a channel estimate and a channel interpolate for the channel estimate if the reference sequence is present. The system and method demodulates at least one orthogonal frequency division multiplexing (OFDM) symbol according to r.sub.bin*conj(H.sub.bin)/(norm(H.sub.bin).sup.2+Noise_Power). The system and method decodes the demodulated at least one orthogonal frequency division multiplexing symbol, and determines if the decoded at least one orthogonal frequency division multiplexing symbol is correct.

Techniques for improving microphone noise suppression are provided. When a playback signal is available, a device may use the playback signal as a reference while performing Acoustic Echo Cancellation (AEC) processing. When the playback signal is not available, the device may instead use microphone audio signal(s) as the reference while performing Adaptive Interference Cancellation (AIC) processing. For example, the device may use first audio data generated by first microphones as the reference while performing AIC processing on the first audio data and second audio data generated by second microphones. As the adaptive filter used to perform AIC processing is updated at a slower rate, the reference signal only cancels stationary portions of the first audio data (e.g., noise), leaving a representation of transient sounds such as speech. In some examples, the device may perform AIC processing and AEC processing in series.

Systems, methods, devices, and means for multipath mitigation, interference cancellation and multilateration in a cellular network supporting accurate and resilient position, navigation, and timing (PNT) services are described. The techniques described herein include operations directed to processing positioning reference signals (PRSs) to determine time of arrival (TOA) measurements for determining user equipment (UE) position in the presence of multipath noise and interferences. Example operations associated with processing PRSs includes receiving one or more PRSs in accordance with a comb pattern via resources defined by a set of orthogonal frequency division multiplexing (OFDM) symbols and a set of subcarriers. The example operations include generating a single OFDM symbol comprising the set of subcarriers based on combining the set of OFDM symbols into the single OFDM symbol. The example operations further include performing a multipath mitigation operation using the single OFDM symbol.

Methods and apparatuses for discrete Fourier transform phase rotated permutation based orthogonal frequency division multiplexing (DFT-p-OFDM). An electronic device includes a processor configured to generate an input symbol vector of length M, and generate, from the input symbol vector, based on a first parameter c, a DFT-p-OFDM waveform. The electronic device also includes a transceiver operably coupled to the processor. The transceiver is configured to transmit the DFT-p-OFDM waveform.

An orthogonal frequency-division multiplexing (OFDM) signal is obtained by spreading a sequence of N.sub.bit number of bits to obtain N.sub.symb number of modulation symbols based on multiplying each bit in the sequence of N.sub.bit number of bits with a corresponding spreading sequence in a sequence of N.sub.bit number of spreading sequences. Each spreading sequence in the sequence of N.sub.bit number of spreading sequences is a linear phase sequence having a constant rotational phase angle . The N.sub.symb number of modulation symbols are multiplied with a discrete Fourier transform precoder to obtain N.sub.symb number of Fourier coefficients. The OFDM signal including the N.sub.symb number of Fourier coefficients mapped onto K number of OFDM subcarriers is transmitted.