A signal processing method in a digital-domain includes: adding a random number sequence signal into a time-domain input signal to generate a time-domain processed input signal; performing a Fourier transform operation upon the time-domain processed input signal to generate a frequency-domain processed input signal; performing an equalizer operation upon the frequency-domain processed input signal to generate a frequency-domain output signal according to coefficients of the equalizer operation; performing an inverse Fourier transform operation upon the frequency-domain output signal to generate a time-domain output signal; generating a decision output signal and generating a time-domain error signal according to the time-domain output signal; and determining the coefficients according to the time-domain error signal and the frequency-domain processed input signal.

One example discloses an OFDM wireless communications device, including: a memory configured to support processing of OFDM tones; a controller, coupled to the memory, and configured to set the wireless communication device to a first mode and a second mode; wherein the first mode is configured to transmit or receive a first wireless communication signal having a first set of OFDM tones contained within an OFDM channel bandwidth; wherein the second mode is configured to transmit or receive a second wireless communication signal having a second set of OFDM tones contained within the OFDM channel bandwidth; and wherein the memory used for processing the first set of OFDM tones is same as the memory used for processing the second set of OFDM tones.

Frame formatting for communications within single user, multiple user, multiple access, and/or MIMO wireless communications. A signal is processed within a communication device using at least two respective downclocking ratios (e.g., a first downclocking ratio applied to a first portion of the signal such as a frame or packet extracted there from, a second downclocking ratio applied to a second portion of the signal). Alternatively, a signal is divided into more than two respective portions, and different respective downclocking ratios are applied to those different respective portions (e.g., a first downclocking ratio applied to a first portion of the signal, and so on up to an n-th downclocking ratio applied to an n-th portion of the signal). Some implementations apply a singular or common downclocking ratio to more than one portion of the signal (which may be contiguous/adjacent or non-contiguous/non-adjacent within the signal).

Embodiments herein describe an FFT that can bypass one or more stages when processing smaller frames. For example, when all the stages in the FFT are active, the FFT can process up to a maximum supported point size. However, the particular application may only every send smaller sized frames to the FFT. Instead of unnecessarily passing these frames through the beginning stages of the FFT (which adds latency and consumes power), the embodiments herein can bypass the unneeded stages which reduces the maximum point size the FFT can process but saves power and reduces latency. For example, the FFT can have selection circuitry (e.g., multiplexers) disposed between each stage that permits the input data to either bypass the previous stage(s) or the subsequent stage(s), depending on the architecture of the FFT. The bypassed stages can then be deactivated to conserve power.

Provided is a communication system that can sustain a reduction in delay in FFT/IFFT processing by code blocking user data, even in a case where the functions of upper layers such as a MAC scheduler and the function of the radio physical layer are implemented separately. In a radio base station (communication system) including a central aggregation device 210 and a remote device 220, the central aggregation device 210 transmits code blocks in a number necessary for generating an OFDM symbol as a piece of data to the remote device 220, the code blocks being produced by dividing user data into units of encoding processing.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may determine, based at least in part on a decomposition rule for a discrete Fourier transform (DFT) block, a plurality of decomposition groups for tones, corresponding to a plurality of antenna ports of the UE, of a transmission. The UE may map the tones to the plurality of decomposition groups for transmission processing, and transmit, using the plurality of antenna ports, the transmission based at least in part on transmission processing. Numerous other aspects are provided.

Methods and systems are provided that enable an OFDM transmitter to be used for transmitting conventional OFDM or a form of transformed OFDM. A technique is provided for transforming a coded and modulated sequence of samples prior to an IFFT that enables the transformed sequence of samples to be transmitted using conventional OFDM or transformed OFDM. The selection of a transform function for transforming the coded and modulated sequence of samples may be based on optimizing the transform function for particular operating conditions between the transmitter and receiver. In some embodiments of the invention OFDM and time transformed OFDM are multiplexed in time and/or frequency in a transmission frame. In some embodiments of the invention a pilot pattern is provided in which the pilot are sent using OFDM and data is sent using OFDM and/or transformed OFDM.

A resource assignment method, a related device, and an apparatus. The method includes: receiving, by a terminal from a network device, a resource assignment indication used to indicate frequency domain resource assignment, where the resource assignment indication is used to indicate a plurality of first resource units assigned to the terminal and that the plurality of first resource units are categorized into one or more groups, where a quantity of first resource units in each group is a product of powers of 2, 3, and 5; and performing, by the terminal, discrete Fourier transform based on the plurality of first resource units. According to the resource assignment method , flexible resource assignment can be performed, and spectrum utilization can be improved.

Techniques are provided for a fast Fourier transform (FFT) sample reorder circuit for a dynamically reconfigurable oversampled channelizer. An FFT sample reorder circuit implementing the techniques according to an embodiment includes a plurality of dual port memory circuits. The circuit also includes a first crossbar circuit configured to route input data samples to write ports of the plurality of dual port memory circuits. The circuit further includes a second crossbar circuit configured to route reordered output data samples from read ports of the plurality of dual port memory circuits to a multi-stage FFT circuit. The circuit further includes a controller circuit configured to control the routing of the input data samples and the routing of the reordered output data samples based on a selection of a stage of the multi-stage FFT circuit.

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.