53 results about "High spectral efficiency" patented technology

A near-optimal Karhunen-Loeve basis expansion modeling (KL-BEM) orthogonal time frequency space (OTFS) receiver with superimposed pilots has been proposed for high-mobility communications with Doppler spread channel. First, an initial KL-BEM channel estimation is conducted by superimposed pilots, followed by the removal of superimposed pilots from the received OTFS signal and equalisation by message passing (MP) algorithm. After that, the detected data symbols are utilized as pseudo pilots along with the superimposed pilots to refine both KL-BEM channel estimation and equalisation in an iterative manner. Simulation results confirm the superior performance of the proposed KL-BEM OTFS receiver over the prior art in terms of the mean-square-error (MSE) of channel estimation and bit error rate (BER). It also has a close BER performance to the BER lower bound obtained by assuming perfect channel estimation. It contributes to high spectral efficiency and fast convergence performance.

A precoder index is derived from a precoder codebook using a low computationally complex process. A plurality of uplink channel matrix estimates are received at a Base Station (BS) from a User Equipment (UE). The plurality of uplink channel matrix estimates are processed to determine an indicator of the precoder having a highest spectral efficiency estimate. The indicator of the precoder having the highest spectral efficiency estimate is selected for transmission by the BS.

Systems and methods are disclosed for radio resource arbitration for spectrum sharing between different Radio Access Technologies (RATs). In one embodiment, a method performed by a network node for radio resource arbitration for spectrum sharing between a first RAT and a second RAT comprises, for a non-Multicast Broadcast Single Frequency Network (MBSFN) subframe, determining whether non-latency-sensitive traffic for the first RAT can be delayed to one or more next MBSFN subframes and, upon determining that non-latency-sensitive traffic for the first RAT can be delayed, determining an amount of non-latency-sensitive traffic for the first RAT to be delayed until the one or more next MBSFN subframes. By leveraging the results of this determining, improved spectral efficiency and throughput can be achieved.

A method, a network device, and a non-transitory computer-readable storage medium are described in relation to an MIMO selection service. The MIMO selection service may include calculating MIMO configurations that include a number of layers for each MIMO configuration pertaining to a group of end devices; and identifying performance metric sensitive end devices of the group. The MIMO selection service may further include selecting for each performance metric sensitive end device, a first MIMO configuration from the MIMO configurations that has a higher number of layers relative to one or more other MIMO configurations of the MIMO configurations; and selecting for each non-performance metric sensitive end device of the group, a second MIMO configuration from the MIMO configurations that combined with the first MIMO configuration yield a highest spectral efficiency.

Systems and methods are described for generating and implementing pulse-shaping filters for efficient utilization of limited spectral resources in wireless communication systems. Wireless communication systems operating at high spectral efficiency conventionally use pulse shaping filters that rely on Nyquist waveforms for good main lobe performance with low inter-symbol interference (ISI) power. Conventional uses of non-Nyquist waveforms typically involve an orthogonalization process to convert those non-Nyquist waveforms to Nyquist waveforms for ISI free performance. Embodiments of pulse shaping filters described herein generate a non-Nyquist partial response (NNPR) transmit filter and / or matched receive filter based on applying a tunable second-weighted orthogonalization to a tunable first-weighted non-Nyquist waveform to obtain a pulse-shaping waveform with parametric control over throughput and power penalty.

The invention discloses a polarization code construction method and device for a serial cancellation list decoder. The method comprises the following steps: calculating a serial cancellation list decoding algorithm performance lower bound; and determining a polarization code information bit set according to the performance lower bound of the serial offset list decoding algorithm. According to the polarization code construction method and device for the serial offset list decoder disclosed by the invention, the polarization code can be constructed by utilizing the polarization code serial offset list decoding lower bound, the error performance of the polarization code is improved, the error rate is reduced, and the communication requirements of high reliability and high spectral efficiency are met. The method is simple and convenient to operate, is particularly suitable for being applied to an actual communication system, and has a very good practical prospect.

A method, a network device, and a non-transitory computer-readable storage medium are described in relation to an MIMO selection service. The MIMO selection service may include calculating MIMO configurations that include a number of layers for each MIMO configuration pertaining to a group of end devices; and identifying performance metric sensitive end devices of the group. The MIMO selection service may further include selecting for each performance metric sensitive end device, a first MIMO configuration from the MIMO configurations that has a higher number of layers relative to one or more other MIMO configurations of the MIMO configurations; and selecting for each non-performance metric sensitive end device of the group, a second MIMO configuration from the MIMO configurations that combined with the first MIMO configuration yield a highest spectral efficiency.

A method, a network device, and a non-transitory computer-readable storage medium are described in relation to an MIMO selection service. The MIMO selection service may include calculating MIMO configurations that include a number of layers for each MIMO configuration pertaining to a group of end devices; and identifying performance metric sensitive end devices of the group. The MIMO selection service may further include selecting for each performance metric sensitive end device, a first MIMO configuration from the MIMO configurations that has a higher number of layers relative to one or more other MIMO configurations of the MIMO configurations; and selecting for each non-performance metric sensitive end device of the group, a second MIMO configuration from the MIMO configurations that combined with the first MIMO configuration yield a highest spectral efficiency.

Systems and methods for early Channel State Information (CSI) feedback in New Radio (NR) are provided. In embodiments of the disclosure, CSI reporting is performed during a random access procedure to provide early CSI feedback and enable more efficient data transmission with higher spectral efficiency in earlier communications. In some examples, CSI reporting can be reported on Message 3 of the random access procedure after measuring channel and / or interference on a CSI Reference Signal (RS) (CSI-RS) during the random access procedure. The proposed solution allows early CSI to be triggered when a User Equipment (UE) performs initial access to a serving cell. With the early CSI acquired, the network can perform proper link adaptation including Multiple Input Multiple Output (MIMO) precoding, and ensure efficient data transmission without having to wait until connection setup and configuration of the CSI framework is established.

The application relates to the field of optical communication technology, and provides a four-level modulation receiving device and method based on double-polarization double-binary superposition, which comprises a transmitting module, a transmission link and a receiving module; the transmitting module is used for outputting a first binary baseband signal, outputting a first three-level double-binary electrical signal, outputting a second binary baseband signal, outputting a second three-level double-binary electrical signal, performing polarization orthogonal superposition on the first three-level double-binary electrical signal and the second three-level double-binary electrical signal, and outputting one superimposed optical signal; the transmission link is used for transmitting the one superimposed optical signal; and the receiving module is used for receiving the one superimposed optical signal and restoring the one superimposed optical signal into the first binary baseband signal and the second binary baseband signal. The application realizes effective unification of high dispersion tolerance and high spectral efficiency by superimposing two double-binary signals on orthogonal polarization states.

The present invention discloses a high spectral efficiency and low power consumption joint channel coding modulation optical communication method and system, and relates to the field of high-speed optical fiber communication technology. It includes a data acquisition step, a symbol multiplexing joint channel coding modulation step, a signal light transmission step, a channel equalization step, and a symbol demultiplexing step. The present invention aims to improve the problems of relative independence of forward error correction channel coding FEC and high-order modulation function modules in optical transmission, dependence on FEC long code length, limited spectrum efficiency improvement under the limitation of optical fiber nonlinear effects, and high FEC decoding delay and power consumption, which is beneficial to improving the spectrum efficiency and capacity of coherent optical transmission systems and optimizing system delay and power consumption.

This invention discloses an HPAM-DMT-NOMA method based on time-domain preprocessing, comprising: At the transmitting end, PAM modulation is performed on the input user transmission bits to generate PAM symbols; after power superposition, serial-to-parallel conversion, and Hermitian symmetry, the symbols are allocated to two signal components for HPAM-DMT transmission; the frequency domain signals of PAM-DMT and RPAM-DMT are calculated; an IFFT operation is performed to obtain the time domain signal; the time-domain preprocessed signal is calculated; the RPAM-DMT time domain signal is calculated and superimposed on the clipped PAM-DMT signal for synchronous transmission to obtain a mixed signal; a reconstructed signal is introduced, processed, and input to drive an LED for illumination; at the receiving end, the received signal is processed to generate a frequency domain signal, and finally, the multi-user signal is recovered. This scheme eliminates clipping noise interference between the mixed signal components, avoids error propagation problems, and achieves high spectral efficiency and power efficiency.

The invention discloses an index modulation method based on orthogonal time-frequency-space and related equipment, and belongs to the technical field of communication. The method comprises the following steps: a transmitting end divides a bit stream to be transmitted into a plurality of groups of bits; performing index modulation on each sub-block according to an index bit and an information bit, assembling each sub-block into a large time delay Doppler domain block, performing orthogonal time frequency air conditioning on the time delay Doppler domain block, and transmitting the time delay Doppler domain block to a channel; after a receiving end receives the signal, orthogonal time-frequency-space demodulation is carried out, and a time delay Doppler domain block obtained through demodulation is split into a plurality of sub-blocks; the method comprises the following steps of: judging an index mode of a sub-block to obtain an index bit of the sub-block, adjusting the sub-block according to the index mode, demodulating a symbol into an information bit to obtain all bits of the sub-block, and finally combining the bits of all the sub-blocks to obtain a complete bit stream. According to the method, relatively low error rate performance can be realized while relatively high spectral efficiency is maintained, and the method is more suitable for underwater acoustic communication with requirements on reliability and spectral efficiency.

The invention discloses a high-spectral-efficiency transmission method suitable for a star-sky cognitive network forward link, which comprises the following steps of: selecting two gateway stations with the best channel quality from a plurality of independent and unrelated gateway stations on the ground to carry out Alamouti space-time coding in a satellite and high-altitude platform frequency spectrum sharing scene, and communicating with a stationary orbit satellite by utilizing a terahertz frequency band. And the satellite determines a decoding sequence according to the channel state information of the user, and a robust beam forming scheme based on a virtual signal to interference plus noise ratio criterion is completed only under the imperfect CSI condition of the known high-altitude platform user. NOMA user combination is dynamically optimized through beam forming processing and a multi-user feedback mechanism, and time-frequency resource multiplexing maximization is achieved. According to the invention, aiming at a forward link of a starry sky cognitive network, space-time coding and a non-orthogonal multiple access technology are combined, so that spectrum coexistence of a satellite network and a high-altitude platform network is realized, and the spectrum efficiency of the system is remarkably improved.

The invention discloses an optical fiber sensing integrated system based on a phase coding optical carrier. The optical fiber sensing integrated system is composed of an optical path detection part and a circuit demodulation part. The whole system is composed of a continuous wave laser, an optical fiber coupler, an acousto-optic modulator, a multi-phase coding generator, a polarization controller, an intensity modulator, a communication signal generator, an optical fiber amplifier, a dispersion compensation module, an optical fiber circulator, an optical fiber, a photoelectric detector, a data acquisition module, a data processing module and a high-sensitivity coherent receiver. The system is simple, only one single-wavelength laser is adopted as a light source, and the system is highly integrated, simple, easy to implement and easy to adjust; the whole system adopts a common time frequency integrated signal to realize a communication sensing integrated system, and has high spectrum efficiency; the whole system can flexibly adjust the system communication and distributed sound wave sensing performance only by adjusting the carrier signal power ratio, the flexibility of the system is improved, and more application scenes are covered.

This invention belongs to the field of wireless communication technology and discloses a selection method for a high-spectrum-efficiency R16QAM (Rateless 16QAM) structured bit selector. First, N information bits are encoded using a 1 / 3 code rate Turbo code to obtain a 3N-length coded bit block to be transmitted. Then, the coded bit block is progressively selected in a structured manner according to the symbol transmission order, and finally transmitted and received in a rateless manner. Specifically, bits are extracted from multiple candidate sub-blocks and recombined to generate structured bit sub-blocks. Multiple bit sub-blocks constitute a single bit block, and different bit blocks are progressively generated. This structured "bit sub-block-bit block-progressive bit block" construction method reintegrates the entire coded bit block to be transmitted into a hierarchical structured block, providing the receiver with iteratively demodulated and decoded multi-dimensional correlation observation information.

The invention is a system that regulates spectrum access by predicting the interference intent of neighboring networks in 6G shared spectrum use. The system consists of a spectrum monitoring module (1), a behavior analysis and prediction unit (2), an interference intent scoring engine (3), a dynamic spectrum access controller (4), an adaptive resource allocation unit (5), and a network coordination interface (6). By analyzing the spectrum usage habits of neighboring networks, the system detects potential interference risks in advance and takes adaptive measures accordingly. In this way, uninterrupted communication, high spectral efficiency, and low latency are ensured in 6G networks.

The application discloses a coherent optical communication system and a sequence detection method based on LUT soft decision output, wherein at the sending end of the coherent optical communication system, binary bit stream original data is first mapped into QPSK symbols, the original QPSK signal is filtered through a narrow-band digital filter to obtain a narrow-band filtered QPSK signal, then the pre-filtered QPSK signal is Nyquist sampled to obtain a digital signal to be sent, after the sending end DSP is completed, the digital signal to be sent needs to be converted into an analog signal through a digital-to-analog converter, the analog signal is optically modulated through an optical modulator to obtain an optical domain sending signal, the optical domain sending signal is transmitted through an optical fiber to reach a receiving end, coherent optical reception is realized through a coherent receiver, a digital signal is obtained through an analog-to-digital converter, a series of receiving end DSP pretreatments are carried out, finally, a BCJR algorithm based on LUT is used to perform sequence detection on the pretreated signal to recover original data. The system can realize long-distance coherent optical communication with high transmission rate and high spectral efficiency.

A system comprises a decision logic module, a payload IC, an optical transceiver, a mmWave transceiver, and an antenna array. The decision logic module evaluates channel conditions and selects one of four transmission modes based on a signal quality indicator. The payload IC generates baseband data and receives demodulated data. The optical transceiver, coupled to the decision logic and payload IC, transmits and receives optical signals via a free-space link using either a first or second modulation format. The optical array handles optical signal emission and reception. The mmWave transceiver, coupled to the decision logic and payload IC, transmits and receives mmWave signals via a free-space mmWave link using a third or fourth modulation format. The antenna array supports mmWave emission and reception. The first modulation format offers higher spectral efficiency than the second. The third provides a higher data rate than the fourth under favorable signal-to-noise conditions.

A system for satellite communications includes a decision logic module, a payload integrated circuit, an optical transceiver, an optical array, a millimeter wave transceiver, and an antenna array. The decision logic module evaluates channel conditions and selects one of four transmission modes based on a signal quality metric. The payload integrated circuit generates outbound baseband data and receives demodulated data. The optical transceiver is coupled to the decision logic module and transmits and receives optical signals over a free space link using a first or second modulation format. The optical array is responsible for optical signal transmission and reception. The millimeter wave transceiver is coupled to the decision logic module and transmits and receives millimeter wave signals over a free space millimeter wave link using a third or fourth modulation format. The antenna array supports millimeter wave transmission and reception. The first modulation format requires a higher signal-to-noise ratio and provides a higher spectral efficiency than the second modulation format, and the third modulation format requires a higher signal-to-noise ratio and provides a higher data rate than the fourth modulation format.

This invention discloses a method for achieving highly spectrally efficient secure transmission. First, legitimate transceivers share chaotic sequence initial values ​​and employ the same chaotic mapping method, thereby sharing a set of chaotic sequences. Secondly, a secure mapping method is designed based on the chaotic sequences, linking information bits with constellation pattern indices and modulation symbols. Because an unauthorized eavesdropper cannot obtain the chaotic sequence initial values, and because the chaotic mapping method is sensitive to these initial values ​​and exhibits aperiodicity, even if they know the secure mapping method, they would be unable to correctly decode legitimate signals. The physical layer security technology proposed in this invention offers both high security and high spectral efficiency.

The application discloses a mirror suppression mixing device with in-band self-interference cancellation capability, wherein a central station comprises a signal processing module, a 90-degree electrical coupler a, a photodetector x, a photodetector y, a polarization beam splitter and an optical power amplifier; a transmission medium is a single-mode optical fiber; a remote base station comprises a laser, a polarization controller, a polarization multiplexing-double drive-Mach-Zehnder modulator, an optical filter, a receiving antenna, a transmitting antenna, a direct current source x, a direct current source y, an electrical beam splitter a and an electrical beam splitter b, an electrical beam combiner a and an electrical beam combiner b, a 90-degree electrical coupler b, a local oscillator signal generator, an electrical attenuator and an electrical delay line. The application also provides a mirror suppression mixing method with in-band self-interference cancellation capability. The application not only can play the high spectral efficiency advantage of the in-band full duplex system, but also is not affected by the dispersion-induced power periodic fading phenomenon caused by optical fiber transmission, can effectively eliminate self-interference signals under the in-band full duplex system, and can effectively suppress the mirror interference caused by the open channel reception.

Embodiments of the present application provide a beam search method, device, system, electronic equipment and readable medium. The method comprises selecting a terminal radio frequency link from a plurality of terminal radio frequency links as a selected terminal radio frequency link, selecting a plurality of first point columns in a preset terminal beam grid, and receiving a reference signal transmitted by a base station in an omnidirectional manner using a communication beam corresponding to the first point column; determining the average spectral efficiency of the communication beam corresponding to the first point column; determining a terminal high spectral efficiency region in the terminal beam grid based on the difference in average spectral efficiency between the first point columns; determining a target communication beam corresponding to the selected radio frequency link in the terminal high spectral efficiency region; and selecting a communication beam with a direction close to that of the target communication beam as a target communication beam corresponding to other terminal radio frequency links in the plurality of terminal radio frequency links except the selected terminal radio frequency link. The embodiments of the present application effectively reduce the beam search complexity and shorten the time for determining the preferred communication beam.

Systems and methods are described for generating and implementing pulse-shaping filters for efficient utilization of limited spectral resources in wireless communication systems. Wireless communication systems operating at high spectral efficiency conventionally use pulse shaping filters that rely on Nyquist waveforms for good main lobe performance with low inter-symbol interference (ISI) power. Conventional uses of non-Nyquist waveforms typically involve an orthogonalization process to convert those non-Nyquist waveforms to Nyquist waveforms for ISI free performance. Embodiments of pulse shaping filters described herein generate a non-Nyquist partial response (NNPR) transmit filter and / or matched receive filter based on applying a tunable second-weighted orthogonalization to a tunable first-weighted non-Nyquist waveform to obtain a pulse-shaping waveform with parametric control over throughput and power penalty.

The invention provides a self-adaptive multi-level coding transmission method and device and electronic equipment. Multi-level coding modulation is carried out at a transmitting end based on a modulation coding scheme identifier according to a pre-constructed offline parameter table. And demodulating and decoding at a receiving end according to the same modulation coding scheme identifier and the corresponding multi-level coding modulation structure. On one hand, the structure retains the capability of an MLC coding modulation structure for finely distributing code rates to match channels, and can realize higher spectrum efficiency compared with a BICM coding modulation architecture. And on the other hand, when a receiving end demodulates and decodes, the multi-level coding structure has the characteristic of local parallelism, so that the time delay of demodulation and decoding can be reduced, and the defect of low throughput rate of an MLC coding modulation structure is improved to a certain extent.

The present invention belongs to the field of wireless communication technology, and specifically relates to a signal receiving and transmitting method of an OFDM symbiotic wireless communication system. The method proposed in the present invention uses a comb pilot to estimate the synthetic channel symbol by symbol in the process of receiving and demodulating the main signal, so that the main signal demodulation does not need to know the secondary information symbol. Compared with the traditional demodulation method, the method proposed in the present invention decouples the demodulation process of the primary and secondary signals, which greatly reduces the calculation complexity, and also reduces the changes to the OFDM main system caused by the introduction of the secondary system. At the same time, in the case where the direct link is very bad or even blocked, compared with the traditional method that cannot decouple the primary and secondary signals multiplied in the reflection link, the method proposed in the present invention can smoothly estimate and demodulate the primary and secondary signals, significantly expanding the application scenarios of OFDM symbiotic wireless communication. The present invention can achieve high-speed mobile communication performance improvement and high-spectral efficiency and high-energy efficiency low-speed Internet of Things communication, and has important application value and development potential.

The invention discloses a non-cellular large-scale MIMO system signal detection method based on a GSIC algorithm, and belongs to the technical field of wireless communication. The method comprises the following steps: constructing a quantization system model; grouping all the user equipments, the groups being continuously detected, and simultaneously detecting the user equipments within the same group; constructing a grouping SIC signal detection algorithm GSIC; detecting the received signal matrix by using an MRC-GSIC or ZF-GSIC algorithm to obtain a sending signal estimated value of the user equipment; an ideal ADC system is compared with an ADC quantized system through a simulation experiment, a simulation result shows that the spectral efficiency can be improved along with the increase of the number of groups, and the system can achieve high spectral efficiency and high energy efficiency close to SIC detection under the condition of fewer groups, so that the system has high application value. However, the calculation complexity is greatly reduced, so that the hardware cost and the energy consumption can be greatly reduced.

The invention belongs to the technical field of wireless communication, and discloses a selection method of a high-spectrum-efficiency R16QAM (Radio 16QAM) structured bit selector, which comprises the following steps of: firstly, coding an information bit with the length of N through a Turbo code with a 1 / 3 code rate to obtain a to-be-transmitted coded bit block with the length of 3N, and then, carrying out structured progressive selection on the coded bit block according to a symbol transmission sequence to obtain a coded bit block with the length of 3N; and then sending and receiving in a rateless manner. Specifically, bits are extracted from a plurality of candidate sub-blocks and recombined to generate structured bit sub-blocks, a plurality of bit sub-blocks form a bit block, and then different bit blocks are generated progressively. According to the construction method of the structured'bit sub-block-bit block-progressive bit block ', the whole coding bit block to be transmitted is re-integrated into a hierarchical structured block, and multi-dimensional related observation information capable of iteratively demodulating and decoding is provided for a receiving end.

In order to improve high-reliability data transmission performance in a high spectral efficiency scene, the invention provides a 4096QAM probability shaping coding modulation method used under a Rayleigh fading channel, according to the method, through average mutual information AMI theoretical analysis and frame error rate simulation verification, when the spectral efficiency is 9.60 bit / s / Hz, compared with a traditional equal-probability rule 4096QAM coding modulation scheme, the probability shaping coding modulation method has the advantages that the probability shaping coding modulation efficiency is greatly improved, and the probability shaping coding modulation efficiency is greatly improved. A 4096 QAM probability shaping coding modulation scheme under a Rayleigh fading channel is provided, so that a simulation gain of 1.35 dB can be obtained; when the spectral efficiency is 10.00 bit / s / Hz, compared with a traditional equal-probability rule 4096 QAM coding modulation scheme, the provided 4096 QAM probability shaping coding modulation scheme under the Rayleigh fading channel can obtain the simulation gain of 11.30 dB, and compared with the traditional equal-probability rule 4096 QAM coding modulation scheme, the reliable transmission performance of the system can be improved.

The invention discloses an efficient retransmission scheduling method and system in a time division multiple access (TDMA) system, and relates to the technical field of wireless communication. The method is dominated by a network coordinator (AP), and a superframe is divided into a main time division multiple access (TDMA) period and a shared retransmission time slot period sounding reference signal (SRS). In the main TDMA period, if no data is sent in the allocated uplink time slot, the device STA must send the NULL frame, so that the AP can reliably detect the uplink failure. And the AP detects a transmission failure event in real time when the TDMAP is carried out, incrementally constructs a retransmission scheduling table, immediately broadcasts an SRS-MAP frame after a main TDMA period is ended, and intensively executes conflict-free retransmission in an SRS period. According to the invention, the contradiction between the resource efficiency and the retransmission delay of the traditional TDMA system is solved, and the beneficial effects of high spectrum efficiency, low retransmission delay, reliable failure detection and self-adaption to network change are realized.