16 results about "Intercarrier interference" patented technology

The invention belongs to the technical field of signal processing, and particularly relates to a coherent light high-speed transmission signal processing method based on deep joint compensation, which comprises the following steps of: performing fine frequency offset and inter-carrier interference joint preprocessing on a coherent light receiving sampling sequence; obtaining a pre-processing output sequence and at least one estimation parameter derived from fine frequency offset and inter-carrier interference combined pre-processing; inputting the preprocessing output sequence into a diffusion type score guide joint compensation network module to obtain a deep joint compensation sequence; performing online judgment and decoding on the deep joint compensation sequence, and adaptively updating internal parameters of the diffusion type score guide joint compensation network module when a preset adaptive updating condition is met; according to the invention, the symbol residual error can be obviously reduced, the forward error correction gain can be improved, and the stability and robustness of the system under high-order modulation, high symbol rate and long-distance link scenes can be enhanced.

The invention discloses an interference equalization method, device and equipment for multi-carrier modulation in a high-dynamic scene and a storage medium, and relates to the technical field of mobile communication, and the method comprises the steps: obtaining a time domain channel matrix of a time-frequency double-color dispersion channel, and determining an inversion core matrix in a minimum mean square error equalization matrix based on the time domain channel matrix; based on the sparsity structure of the inversion core matrix, decomposing the inversion core matrix to obtain a decomposition matrix; based on the time domain channel matrix, the inversion core matrix and the decomposition matrix, determining a multilayer linear equation set with minimum mean square error equalization; and solving the multi-layer linear equation set to obtain an equalization result. By means of the mode, the calculation complexity of the equalization process in the process of resisting inter-symbol interference and inter-carrier interference existing in multi-carrier modulation in a high dynamic scene is remarkably reduced, excellent performance is still kept under the extreme condition that no cyclic prefix exists or the length of the cyclic prefix is zero, and high scene adaptability and system practicability are embodied.

A method for reducing inter symbol interference (ISI) and inter carrier interference (ICI) in transmissions between a sender and a recipient within a wireless communication network. For at least one multicarrier symbol comprising a first subcarrier modulated with an original reference signal and multiplexed with a second subcarrier modulated with an original payload signal. The method includes applying a multiple symbol shift configuration on at least a second multicarrier symbol adjacent to the first multicarrier symbol by repeating the original reference signal and the original payload signal in the second multicarrier symbol on respective subcarriers and applying a linear phase shift to each repeated reference signal and payload signal. The same linear phase shift is used for both the repeated reference signal and the repeated payload signal.

The application discloses an asynchronous distributed large-scale MIMO general filter multicarrier active user detection method, which is suitable for communication field use. A signal model of a frequency domain receiving signal of an asynchronous large-scale MIMO general filter multicarrier system is given first, and even components of the frequency domain receiving signal not influenced by inter-subband interference and inter-carrier interference are obtained; the asynchronous active user detection problem is expressed as a maximum likelihood estimation problem, then in order to solve the discontinuous and non-convex l0 norm constraint caused by asynchronous transmission, an equivalent penalty reconstruction form is introduced; further, a detection algorithm is provided, which can meet the highly non-convex constraint in a gentle way with the increase of iteration times, converges to a stable point of the original asynchronous active detection problem, and achieves good detection performance.

Common phase error and / or inter-carrier interference. A technique comprising: transmitting data and / or control information; and transmitting a common phase error and / or inter-carrier interference correction reference signal, wherein the common phase error and / or inter-carrier interference correction reference signal occupies variable radio resources.

This invention discloses a time-frequency cooperative Doppler frequency offset suppression method and system for underwater acoustic OFDM communication, belonging to the field of underwater acoustic communication. The method includes: designing a novel channel adaptive tracking resampling factor estimation method, which performs cross-correlation processing only between two specific synchronization signal segments of the received signal, enabling it to adaptively track the time-varying channel and significantly improving the robustness of the communication system in underwater acoustic environments; based on the estimated resampling factor, performing time-domain resampling operations to transform non-uniform frequency offset into uniform frequency offset, thereby eliminating the impact of time-domain scale transformation on the underwater acoustic signal; and designing a residual uniform frequency offset suppression method based on subspace decomposition, using frequency domain eigenvalue decomposition to finely suppress the residual uniform frequency offset of the underwater acoustic signal. Combining the advantages of time-domain resampling and frequency-domain eigenvalue decomposition, it performs excellently in suppressing inter-carrier interference of underwater acoustic signals in highly mobile scenarios, significantly improving signal detection accuracy.

Apparatuses, methods, and systems are disclosed for configurations corresponding to inter-carrier interference. One method includes receiving, at a user equipment (UE), first configuration information for reference signals for performing inter-carrier interference (ICI) estimation including time-frequency resources, a multiplexing pattern, a time-domain behavior, or some combination thereof. The method includes receiving second configuration information for reporting ICI. The second configuration information includes instances of the reference signals for ICI estimation, the time-frequency resources for reporting, the time-domain behavior for reporting, or some combination thereof. The method includes measuring the ICI due to phase noise. The method includes transmitting the ICI report. The method includes receiving third configuration information for performing ICI pre-distortion and phase-tracking reference-signal (PT-RS) adaptation.

The application discloses a signal processing method of power carrier communication based on OFDM modulation, relates to the technical field of power carrier communication, and comprises the following steps: S1, cyclic prefix and guard interval design and insertion; S2, improved synchronization algorithm for frequency offset processing; S3, noise suppression optimization of a front-end signal processing module; S4, parallel processing architecture design and task allocation; S5, channel estimation at a receiving end; S6, frequency domain equalization processing; S7, OFDM demodulation processing; and S8, symbol synchronization and data recovery. Through the steps S1 and S2, the effects of effectively resisting power line channel multipath delay, reducing inter-symbol interference and inter-carrier interference are achieved. Through the steps S3, S5 and S6, the effects of accurately identifying power line impulse noise and Gaussian noise characteristics and dynamically suppressing noise are achieved. Through the steps S4 and S8, the effects of improving signal processing efficiency by using a parallel processing architecture and avoiding processor overload are achieved, and meanwhile, the data error correction capability is enhanced by convolution coding or Turbo coding, so that the real-time performance and reliability of high-speed data transmission are ensured.

The embodiment of the invention discloses a signal preprocessing method and device, communication equipment and a storage medium. The method comprises: a network device receiving first information and a first reference signal sent by a terminal, the first information being used for instructing or notifying the network device to perform inter-carrier interference (ICI) preprocessing; the network device predicts ICI based on the first information and the first reference signal to obtain an ICI prediction result; and the network device preprocesses the signal based on the ICI prediction result.

Methods, systems, and apparatus for wireless communication are described, wherein random access preambles are designed to provide relatively low inter-carrier interference (ICI) of adjacent available frequency resources in a non-terrestrial network (NTN). The random access preamble for an NTN random access request may be selected from a first set of random access preambles, which differs from a second set of random access preambles used for terrestrial random access requests. The first set of random access preambles may be a subset of the second set. The first set of random access preambles may be provided for contention-based random access (CBRA), and contention-free random access (CFRA) preambles may be configured by the base station from random access preambles that correspond to or differ from the second set.

The application discloses a radar communication integrated signal optimization method and belongs to the technical field of radar communication integration. The application constructs a multi-pulse OFDM integrated signal model, designs an ICI self-cancellation precoding matrix based on frequency offset and Doppler effect, and suppresses inter-subcarrier interference; meanwhile, an inter-pulse coherent communication sequence is designed by combining Gold sequences and coherent accumulation constraints, so that the multi-pulse phase coherence is ensured. The transmitting end loads the precoded communication information to OFDM subcarriers to generate an integrated signal; the receiving end first performs ICI compensation and coherent accumulation, and then completes detection and demodulation. The application can significantly reduce waveform sidelobes, improve ranging and speed measurement accuracy and weak target detection performance, is compatible with a traditional OFDM structure, and is suitable for high-speed motion scenes such as vehicle-mounted radars and airborne detection.

Disclosed in embodiments of the present disclosure are a signal preprocessing method and apparatus, a communication device, and a storage medium. The method comprises: a network device receives first information and a first reference signal which are sent by a terminal, the first information being used for instructing or notifying the network device to perform inter carrier interference (ICI) preprocessing; the network device predicts ICI on the basis of the first information and the first reference signal to obtain an ICI prediction result; and the network device preprocesses a signal on the basis of the ICI prediction result.

The invention discloses a signal processing method for power line carrier communication based on OFDM (Orthogonal Frequency Division Multiplexing) modulation, which relates to the technical field of power line carrier communication, and comprises the steps of S1, designing and inserting a cyclic prefix and a guard interval, S2, improving a synchronization algorithm to realize frequency offset processing, S3, performing noise suppression optimization on a front-end signal processing module, and S4, designing a parallel processing architecture and allocating tasks. S5, receiving end channel estimation, S6, frequency domain equalization processing, S7, OFDM demodulation processing, and S8, symbol synchronization and data recovery. According to the invention, through the steps S1 and S2, multipath time delay of a power line channel is effectively resisted, and inter-symbol interference and inter-carrier interference are reduced; through the steps S3, S5 and S6, the effects of accurately identifying the pulse noise and Gaussian noise characteristics of the power line and dynamically suppressing the noise are achieved; through the steps S4 and S8, the parallel processing architecture is utilized to improve the signal processing efficiency and avoid the overload effect of the processor, and meanwhile, the data error correction capability is enhanced through convolutional coding or Turbo coding, so that the real-time performance and reliability of high-speed data transmission are ensured.

The invention provides a frequency offset residual error and phase noise joint compensation method for a lightning stroke scene, and relates to the technical field of signal processing, and the method comprises the steps: obtaining two-dimensional time domain data corresponding to an output balance baseband I / Q of a coherent optical receiver, and sequentially carrying out the phase observation construction and frequency preprocessing of the two-dimensional time domain data, so as to obtain an observation vector sequence; based on the observation vector sequence, the weight information of each observation sample and a preset subcarrier set, constructing a weighted sample covariance matrix, performing characteristic decomposition on the weighted sample covariance matrix, obtaining information subspace, noise subspace and phase jump characteristics caused by lightning stroke, constructing a joint cost function, and calculating the phase jump characteristics of the information subspace, the noise subspace and the lightning stroke. Obtaining residual frequency offset and random phase noise at each sampling frequency point according to the optimal solution of the joint cost function; and performing frequency and phase joint compensation on the received coherent optical baseband signal according to the residual frequency offset and the random phase noise. According to the invention, suppression of inter-carrier interference caused by frequency offset and phase noise is facilitated.

A user equipment (UE) receives a configuration of a CSI report from a network device (gNB), followed by a CSI-RS reference signal. Thereafter, the UE performs channel measurements, including one or more of Doppler spread, average delay, delay spread, phase noise power, and / or inter-carrier interference level; based on these measurements, the UE determines at least one recommended sub-carrier spacing (SCS) value, and sends back the recommended SCS explicitly or implicitly in the CSI report. The gNB receives the CSI report, checks the target requirements, updates the previous SCS to a new SCS, and transmits a PDCCH to schedule a new PDSCH, where the PDCCH informs the UE of the new SCS.

A method, system and apparatus for low complexity intercarrier interference (ICI) compensation algorithms and cyclic block phase tracking reference signal (PTRS) sequence design are disclosed. According to one aspect, a method in a network node includes generating a PTRS, having a PTRS sequence that is configured to lower a complexity of an ICI compensation algorithm. According to another aspect, a method in a wireless device (WD) includes determining an ICI compensation algorithm based at least in part on a PTRS having a PTRS sequence, and applying the determined ICI compensation algorithm to compensate for ICI.