356 results about "Modulation order" patented technology

The invention provides a VDSL ultra-low time delay communication method and system, and relates to the technical field of communication, and the method comprises the steps: encrypting a clock synchronization channel through a quantum key distribution protocol, dynamically dividing micro time slot resources in an orthogonal frequency division multiplexing symbol period, and generating a dynamically adjusted micro time slot resource distribution result; calculating an optimal phase offset matrix of the metasurface intelligent reflecting surface through a depth deterministic strategy gradient algorithm to obtain an optimized electromagnetic wave propagation path; generating a global optimization check matrix by aggregating the locally trained lightweight error correction model gradient of each node to obtain a compensated data stream; and constructing a causal graph model dynamic pruning high-entropy path to minimize causal entropy, through multi-agent reinforcement learning, taking time delay-energy efficiency as a game target to decide an optimal modulation order and a subcarrier switching strategy, and obtaining an optimized stable communication link. According to the invention, high-reliability and low-delay communication basic support is provided for high-precision intelligent manufacturing.

The invention provides an optical-electric hybrid ultra-low time delay communication method and system, and relates to the technical field of communication, and the method comprises the steps: outputting a global synchronous clock signal with clock jitter less than 1ppm, dynamically dividing micro time slot resources in an orthogonal frequency division multiplexing symbol period, and generating a dynamically adjusted micro time slot resource distribution result; calculating an optimal phase offset matrix of the metasurface intelligent reflecting surface through a depth deterministic strategy gradient algorithm to obtain an optimized electromagnetic wave propagation path; generating a global optimization check matrix by aggregating the locally trained lightweight error correction model gradient of each node to obtain a compensated data stream; and constructing a causal graph model dynamic pruning high-entropy path to minimize causal entropy, through multi-agent reinforcement learning, taking time delay-energy efficiency as a game target to decide an optimal modulation order and a subcarrier switching strategy, and obtaining an optimized stable communication link. According to the invention, high-reliability and low-delay communication basic support is provided for high-precision intelligent manufacturing.

The invention relates to the technical field of Internet of Things communication, and provides a low-power-consumption semiconductor communication method based on Internet of Things, which comprises the following steps: acquiring temperature, electromagnetic interference intensity and signal attenuation coefficient data through a multi-mode sensor node, and generating an original environment data set; performing dynamic noise classification on the original environment data set, dividing noise levels and marking noise types; performing hierarchical processing on the data by adopting a multi-stage self-adaptive noise reduction algorithm to generate a preprocessed data set; extracting dynamic characteristic parameters of a communication channel, constructing an energy efficiency prediction model, and dynamically calculating a combination of optimal transmitting frequency, power and modulation order; generating a multi-system modulation signal, superposing a dynamic coding strategy, and adjusting the symbol block length and the error correction code density; and the receiving end analyzes the signal quality index, feeds back the signal quality index to the transmitting end to optimize the parameters and updates the energy efficiency prediction model. According to the invention, the energy efficiency ratio and the anti-interference capability of the Internet of Things communication system can be improved.

The invention relates to an underwater optical communication LDPC (Low Density Parity Check) coding processing method. The method comprises the following steps: determining a current channel quality grade based on a real-time communication distance and channel state information; dynamically selecting LDPC (Low Density Parity Check) coding parameters and modulation orders in combination with equipment mobile data and channel quality levels, and generating an adaptive parameter combination; performing error correction coding on the data according to the selected parameters and generating an optical communication signal; transmitting to a receiving end through an optical channel; and dynamically updating the coding parameter and the modulation order based on the feedback information of the receiving end. According to the method, the problem that a traditional fixed coding scheme is insufficient in error correction capability or wastes resources in a dynamic distance scene is solved by predicting the equipment moving trend and the channel state in real time and adaptively adjusting the coding parameters and the modulation mode, the error rate is remarkably reduced, the communication efficiency is improved, and the method is suitable for a complex and changeable underwater optical communication environment.

Certain aspects of the present disclosure provide a method for wireless communications at a wireless node. The wireless node may decide whether to perform probabilistic shaping based on single-bit level shaping or multiple-bit level shaping on a bit sequence of a signal. The bit sequence includes a set of bits. The wireless node may make this decision based on a modulation order and / or a modulation and coding scheme (MCS) index value. The wireless node may perform the probabilistic shaping on the bit sequence, in accordance with the decision.

Methods and apparatuses for transmitting and receiving information of different priorities. A method of operating a UE includes receiving a first PDCCH providing a first DCI format. The first DCI format schedules a reception of a PDSCH, includes an MCS field, and includes a priority indicator field. The method further includes determining an MCS table, from a first predetermined MCS table or a second predetermined MCS table, based on a value of the priority indicator field in the first DCI format; determining a modulation order and a code rate from the MCS table based on a value of the MCS field; receiving a TB in the PDSCH according to the modulation order and the code rate; and determining a priority of HARQ-ACK information in response to the TB reception based on the value of the priority indicator field in the first DCI format.

The invention discloses a communication data transmission method and system for an intelligent charging pile, and relates to the technical field of intelligent charging pile communication, and the method comprises the steps: constructing a reverse power line transmission channel model based on an equivalent channel response matrix, extracting channel frequency response, generating a channel equalization configuration parameter set through a joint optimization equalization algorithm, and transmitting the channel equalization configuration parameter set to a communication module. Subcarrier modulation orders are dynamically allocated according to the signal-to-noise ratio parameter, and a pre-balanced OFDM time domain signal is generated; on the basis of the channel equalization configuration parameter set and the pre-equalization OFDM time domain signal, dynamically monitoring power frequency harmonic noise of the cable, and inhibiting interference through a filtering algorithm to generate a clean power line carrier signal; and generating a verified V2G communication control instruction through a cyclic redundancy check method based on the clean power line carrier signal in combination with the main polarization direction feature vector. According to the method, an accurate channel model is constructed by combining an equivalent channel response matrix and cable characteristics, and dynamic subcarrier distribution is realized based on signal-to-noise ratio parameters.

The invention proposes a transmitter arranged to transmit a sequence of physical layer frames at a physical layer symbol rate, said sequence being filtered with a transmit filter, and comprising adaptive coding and modulation means arranged to determine a modulation and coding for transmitting data, whereby the transmitter maps the data in frames using said modulation and coding and inserts encoded and modulated data frames into the sequence. The transmitter further inserts prior to said filtering with the transmit filter, fill frames modulated (and encoded) with a first fill modulation (and coding), said first fill modulation (and coding) selected from a set of fill modulations (and codings) comprising at least one fill modulation (and coding) with a modulation order higher than QPSK.

Methods, systems, and devices for wireless communications are described. A wireless device may perform a probabilistic shaping procedure using a shaping rate that is selected in accordance with a rule associated with a target spectral efficiency value, a modulation order, or both. Similarly, the wireless device may perform a channel coding procedure whose coding rate is selected in accordance with the rule. The rule may correspond to a relationship between the coding rate and the shaping rate. In some cases, the wireless device may select the shaping rate and the coding rate to be predefined values based on a target spectral efficiency value. In some examples, the wireless device may select the shaping rate and the coding rate based on a threshold coding rate, a quantity of punctured nodes used in the channel coding procedure, a quantity of layers corresponding to a multi-layer transmission, or any combination thereof.

The invention discloses a 10kV medium-voltage power distribution network power line carrier communication method and system based on adaptive OFDM (Orthogonal Frequency Division Multiplexing), and the method comprises the steps that a master station sends a detection frame to a slave station, and the slave station carries out the CE (Channel Estimation), and obtains the CSI (Channel State Information); the method comprises the following steps of: dividing a broadband channel into a plurality of parallel orthogonal subcarriers, and dynamically allocating a modulation mode, a modulation order and a forward error correction (FEC) coding rate for each subcarrier of OFDM (Orthogonal Frequency Division Multiplexing) by adopting a water injection algorithm based on channel state information (CSI); adopting two-stage automatic gain control (AGC) to condition a signal received from a power line; and carrying out dynamic frequency hopping between a frequency band with serious interference and an idle frequency band based on a continuous spectrum sensing result. Compared with the prior art, through the multi-dimensional adaptive technology, the communication system can sense the channel state in real time and dynamically adjust the communication strategy, so that a stable communication link is established in a severe power grid environment.

The invention discloses a communication method and device, which can improve the PBCH receiving performance of a narrowband terminal while saving the overhead of a common channel. The method comprises the following steps: an RAN node determines the length of a coding bit sequence of a physical broadcast channel (PBCH) according to a first numerical value E1, determines the coding bit sequence according to the length of the coding bit sequence and an information bit sequence of the PBCH, determines M symbols of the PBCH according to the coding bit sequence, and maps the first M1 symbols in the M symbols to a first time frequency resource, and mapping the remaining M-M1 symbols to a second time frequency resource, wherein M and M1 are positive integers greater than 1. Wherein the first numerical value E1 is the product of M1 and the modulation order, and M1 is the number of effective resource elements RE in the first time-frequency resource. The first time-frequency resource and the second time-frequency resource form a PBCH time-frequency resource. The subcarriers occupied by the first time-frequency resource and the second time-frequency resource are not overlapped. And the first type of terminal acquires the first M1 symbols mapped on the first time-frequency resource, and the second type of terminal acquires the M symbols mapped on the PBCH time-frequency resource.

Provided are a communication method and a communication device, the method comprising: determining a transmission waveform of a signal, the transmission waveform being related to a threshold of a first parameter, the first parameter comprising: a modulation order and a roll-off factor, the transmission waveform is an orthogonal frequency division multiplexing QAM-DFTS-OFDM waveform of discrete Fourier transform spread spectrum of orthogonal amplitude modulation or an orthogonal frequency division multiplexing OQAM-DFTS-OFDM waveform of discrete Fourier transform spread spectrum of offset orthogonal amplitude modulation, and the roll-off factor is determined based on the transmission bandwidth and the number of symbols carried by the transmission waveform. And transmitting or acquiring the signal. In the method provided by the invention, the network equipment or the terminal equipment can determine the transmission waveform of the signal according to the set threshold value of the modulation order and the threshold value of the roll-off factor, so that the output power supporting higher power amplifiers can be obtained, and a larger signal coverage range can be obtained.

The invention discloses a covert communication optimization method based on deep reinforcement learning under limited character input, and belongs to the technical field of wireless communication. According to the method, an optimization problem which takes the minimum average bit error rate as a target function and takes hidden requirements, power and the like as constraints is constructed on a hidden communication model of a transmitting end, a receiving end, an intelligent reflecting surface and a monitor. Firstly, the bit error rate of a receiving end is given, the detection performance of a monitor is analyzed, and the KL divergence upper bound and the corresponding hidden constraint are deduced. The objective function and the constraint set of the constructed problem are non-convex, the optimization problem is trained and solved by constructing the optimization problem into a deep reinforcement learning model, the modulation order which is difficult to optimize by a traditional algorithm is optimized by using the advantages of deep reinforcement learning, a deep deterministic strategy gradient algorithm is selected to train the model, and then the error rate is minimized. And the covert communication performance is improved.

Provided are a method for a first device carrying out wireless communication, and a device supporting same. The method may comprise the steps of: determining the number of resource elements (REs) for determining a Transport Block Size (TBS) on the basis of the number of REs in a single slot and the number of REs on a Physical Sidelink Control Channel (PSCCH) resource in the single slot; acquiring an intermediate number associated with the TBS by multiplying the number of REs for determining the TBS, a code rate, a modulation order and the number of layers; quantizing the intermediate number; determining the TBS on the basis of the quantized intermediate number; and transmitting a sidelink (SL) to a second device on the basis of the determined TBS. Here, the number of REs for determining the TBS may be determined by excluding the number of REs on the PSCCH resource.

The invention belongs to the technical field of communication, and particularly relates to a heterogeneous network adaptive optimization method and system based on a 5G RedCap module, and the method comprises the steps: 1, calculating a node feature value of each 5G RedCap terminal node based on the obtained operation data of each 5G RedCap terminal node in a network; calculating the quantity of resources allocated to the 5G RedCap terminal node according to the node characteristic value; 2, each 5G RedCap terminal node adaptively adjusts the transmitting power, the modulation order and the coding rate of the 5G RedCap terminal node according to the resource quantity currently allocated to the 5G RedCap terminal node and the adjustment parameters; and 3, calculating the network performance, updating the adjustment parameters in combination with the set target network performance, and returning to the step 1. According to the method, the network throughput can be improved, the energy consumption management can be optimized, the bit error rate can be reduced, and the intelligent level and the self-adaptive capability of the system can be improved.

Disclosed are systems and techniques for wireless communications. For instance, a network entity may obtain a first plurality of bits from a first buffer, wherein a start position for obtaining the first plurality of bits from the first buffer is based on a redundancy version order. In some cases, the network entity may determine, based on a modulation order and a probability distribution associated with the first plurality of bits, at least one scaling factor for constellation mapping the first plurality of bits. In some examples, the network entity may map, based on the at least one scaling factor, the first plurality of bits to one or more symbols.

A transmitting apparatus obtains a to-be-modulated bit(s) and modulation condition information MCI; and obtains a first modulated signal based on the to-be-modulated bit(s), the MCI, and a first neural network, and outputs the first modulated signal. Correspondingly, a receiving apparatus obtains the first modulated signal, and demodulates the first modulated signal. The to-be-modulated bit(s) includes N×M bits, M is a modulation order, N is a quantity of first modulation symbols included in the first modulated signal, and both N and M are positive integers.

A UE of a wireless communication network first receives a modulation and coding scheme index IMCS for demodulating a physical layer data channel of the network. The UE then demodulates the physical layer data channel with a non-square quadrature amplitude modulation (NS-QAM) having a modulation order and code rate corresponding to a spectral efficiency (SPEFF) substantially equal to a SPEFF of a square QAM (S-QAM) SPEFF indicted by the IMCS, where the NS-QAM has an effective channel code rate no larger than the code rate for which the UE may skip decoding a transport block in an initial received transmission.

The invention provides a coding modulation method and a related device, and the method comprises the steps: carrying out the coding of N input bit sequences through employing code rates corresponding to the N input bit sequences, and obtaining N coded bit sequences corresponding to the N input bit sequences; the length of each input bit sequence is determined according to at least one of a code rate, a modulation order or the number of resource elements (RE) used for data transmission corresponding to the input bit sequence; the N coded bit sequences are mapped to the same constellation diagram, the constellation diagram comprises M constellation points, each constellation point comprises N segmented bits, and the N segmented bits correspond to the N coded bit sequences respectively. According to the process, the transmission efficiency is guaranteed, the coding complexity of the sending end is reduced, in addition, the protocol modification degree is also reduced, and the coding implementation cost is further reduced.

A communication system includes a transmitter and one or more receivers. The transmitter is arranged to transmit a sequence of physical layer frames at a physical layer symbol rate. An adaptive coding and modulation optimization means are arranged to determine a first modulation and coding for transmitting per receiver of one or more receivers. The transmitter further inserts fill frames modulated (with a first fill modulation) prior to filtering with the transmit filter. The first fill modulation is selected from a set of fill modulations with at least one modulation with a modulation order higher than QPSK. The communication system includes link quality detection, which means to determine a metric of the communication link quality from a version of physical layer frames at the receive side. The physical layer frames include the fill frames and convey the link quality metric to the adaptive optimization means.

The invention relates to the technical field of green communication, and discloses a visible light communication system and method based on CDMA (Code Division Multiple Access), the system comprises a transmitting end module, a visible light channel module, a receiving end module and a dynamic optimization module, by combining a CDMA multiple access technology and OFDM (Orthogonal Frequency Division Multiplexing) modulation, multi-user efficient access and spectrum resource dynamic allocation are realized, and the visible light communication efficiency is improved. User data streams are distinguished based on orthogonal spreading codes, and multi-user interference is effectively suppressed; through an OFDM subcarrier mapping and self-adaptive power allocation algorithm, the subcarrier transmitting power is optimized, the spectrum utilization rate is improved, the problem of resource allocation rigidness in a traditional TDMA / FDMA technology is solved, the communication capacity and the data transmission efficiency in a multi-user scene are remarkably improved, and by measuring the signal-to-noise ratio and the path loss of a channel in real time, the transmission efficiency of the multi-user scene is improved. And the spreading code length and the OFDM modulation order are dynamically adjusted, and signal attenuation and distortion caused by complex illumination conditions and a multipath effect are reduced.

An apparatus and system for channel quality indication (CQI) and aperiodic reporting are described. The UE is configured to use demodulation reference signals (DM-RS) of a physical downlink control channel (PDCCH) or channel state information (CSI) reference signals (CSI-RS) for beam management for CSI reporting. The UE calculates the CQI from the DM-RSI or CSI-RS and sends the CQI to the gNB. The CQI configuration includes power offsets to be applied to the channel measurements for evaluation of the block error rate (BLER) depending on the CQI. Different power offsets are applied for different CQI groups that are determined by the modulation order associated with the calculated CQI.

The invention discloses a wireless local area network system, which comprises a plurality of access points, BSSIDs carried by beacon frames sent by the plurality of access points are the same, and the beacon frames are sent by adopting relatively high modulation orders. For example, the plurality of access points include a first access point and a second access point; the first access point is used for sending a first beacon frame, the first beacon frame is modulated by adopting a first modulation order and comprises a first BSSID, the second access point is used for sending a second beacon frame, the second beacon frame is modulated by adopting a second modulation order and comprises the first BSSID. The first modulation order and the second modulation order are both higher than or equal to a modulation order threshold. Thus, if the signal strength of the beacon frame sent by the access point is weak, the terminal cannot receive the beacon frame from the access point, so that the roaming process cannot be triggered due to the weak signal strength of the received beacon frame, and the service transmission delay is reduced.

The invention provides an intelligent coding transmission regulation and control method and system for an unmanned system, relates to the technical field of unmanned aerial vehicle inspection, and ensures that a high-priority task preferentially obtains resource guarantee when a channel is degraded or interference is enhanced by constructing an environment and task joint matrix and quantifying transmission urgency. The method comprises the following steps: firstly, designing a dynamic efficiency threshold and a hierarchical strategy pool to effectively reduce the interruption risk of a key task, secondly, designing a dynamic efficiency threshold and a hierarchical strategy pool to realize real-time screening and parameter adjustment of a coding strategy, so that a system can be adaptive to channel fluctuation and interference intensity change, and stiffness of a traditional static strategy is avoided; and finally, the self-evolution mechanism of the strategy pool continuously eliminates low-efficiency strategies and generates new strategies, so that the continuous optimization capability of the coding transmission system of the unmanned aerial vehicle in the inspection task is ensured, and the support is provided for the efficient and stable operation of the inspection of the unmanned aerial vehicle.

Methods, systems, and devices for wireless communications are described. A wireless device may perform a probabilistic shaping procedure using a shaping rate that is selected in accordance with a rule associated with a target spectral efficiency value, a modulation order, or both. Similarly, the wireless device may perform a channel coding procedure whose coding rate is selected in accordance with the rule. The rule may correspond to a relationship between the coding rate and the shaping rate. In some cases, the wireless device may select the shaping rate and the coding rate to be predefined values based on a target spectral efficiency value. In some examples, the wireless device may select the shaping rate and the coding rate based on a threshold coding rate, a quantity of punctured nodes used in the channel coding procedure, a quantity of layers corresponding to a multi-layer transmission, or any combination thereof.

The present invention discloses a blind estimation method, system and medium for the carrier frequency offset of FSK based on the L&R algorithm. The method includes the following steps: conjugately multiplying each local modulation sequence with the baseband signal of the FSK signal respectively to obtain corresponding first signals, the number of local modulation sequences corresponding to the modulation order of the FSK signal, and the local modulation sequences being different from each other; low-pass filtering and accumulating all the first signals to obtain a second signal with the modulation information eliminated; discretizing the second signal and then calculating the accumulated sum of the second signal, and substituting the accumulated sum of the second signal into the L&R algorithm to obtain the frequency offset estimation value of the FSK signal. The present invention can perform frequency offset estimation without prior information and has strong practicability.

The invention relates to the technical field of signal analysis and processing, in particular to an FSK signal blind demodulation method and system in underwater acoustic communication signal analysis and processing, and the method comprises the steps: carrying out the coarse estimation of the bandwidth and carrier frequency of an underwater acoustic FSK signal; performing symbol rate estimation and timing synchronization based on an enhanced digital phase-locked loop; down-converting the received signal to zero intermediate frequency; carrying out discrete short-time Fourier transform to obtain a time-frequency domain distribution matrix of the signal; extracting time-frequency domain distribution in a time dimension by taking a symbol period as an interval, and taking out a frequency point with the strongest power at a corresponding moment to obtain a time-frequency distribution sequence of the signal; clustering the time-frequency distribution sequence by using K-means clustering, and judging the modulation order M of the FSK signal according to the contour value; and clustering the time-frequency distribution sequences into M classes, simultaneously obtaining the class to which the frequency corresponding to each sampling point in the sequences belongs, and judging the class as an M-system symbol until the blind demodulation is finished. According to the invention, blind demodulation of FSK signals with guard intervals and without guard intervals can be realized.

The present application discloses an encoding method, a decoding method, and an apparatus. The encoding method comprises: on the basis of a first MCS, a first SNR, a first modulation order, or a first encoding rate, determining a bit rate of a component code corresponding to at least one stage in multi-stage encoding of information bits; on the basis of the bit rates of the component codes corresponding to respective stages in the multi-stage encoding, performing the multi-stage encoding on the information bits to obtain encoded bits; and outputting the encoded bits. Because the first MCS, the first SNR, the first modulation order, or the first encoding rate is a parameter related to a channel condition, in embodiments of the present application, the bit rates of the respective stages in the multi-stage encoding are dynamically configured in consideration of the channel condition, thereby reducing decoding complexity of the multi-stage encoding and also improving encoding / decoding performance of the multi-stage encoding.

The embodiment of the invention relates to a communication method and device. The communication method comprises the steps that indication information is sent, the indication information is used for indicating a waveform adopted by a first signal, and a corresponding relation exists between the waveform and at least one of a code rate, a modulation order and a bandwidth; and transmitting the first signal. In this way, the waveform adopted by the signal can be indicated by the indication information, and the perception performance or communication performance of the first signal is improved.