227 results about "Millimeter wave communication systems" patented technology

An apparatus and method for full-duplex millimeter wave mobile wireless communication are provided. The apparatus includes a Spatial Division Duple (SDD) mobile communication system using millimeter waves, the SDD mobile communication system including a first wireless terminal having a first transmit antenna array having a plurality of first transmit antennas for transmitting a spatially beamformed first transmit beam, and a first receive antenna array having a plurality of first receive antennas for forming a spatially beamformed first receive beam and a second wireless terminal including a second transmit antenna array having a plurality of second transmit antennas for transmitting a spatially beamformed second transmit beam directed towards a receive beam of the first wireless terminal, and a second receive antenna array having a plurality of second receive antennas for forming a spatially beamformed second receive beam directed toward the transmit beam of the first terminal.

A single frame format is employed by a millimeter wave communication system for single-carrier and OFDM signaling. A Golay-coded sequence in the start frame delimiter (SFD) field identifies the data transmission as single carrier or OFDM. Complementary Golay codes are employed in a channel estimation field to allow a perfect estimate of the multipath channel to be made. Marker codes generated from Golay codes are inserted periodically between slots for tracking and/or for reacquiring timing, frequency, and multipath channel estimates. The length of the marker codes may be adapted relative to the multipath delay spread.

The invention provides a beam recovery method and a beam recovery device for a millimeter wave communication system. The method comprises the step of when beam failure information sent by a user sideis received, sequentially switching a current beam pair to one beam pair in a specified beam pair set, until quality of service (QoS) of the switched beam pair is higher than a preset threshold, wherein the beam pair in the specified beam pair set is acquired by screening the beam pairs in a first area and the beam pairs in an adjacent area of the first area, and the first area is the area where the user side is located before beam failure. Beam recovery can be completed by only fewer times of switching when the current beam is sequentially switched to the beam pair in the specified beam pairset; compared with a traditional recovery method based on exhaustive search, the method provided by the invention is greatly reduced in recovery delay and resource overhead needed by beam recovery.

The invention discloses a wave beam alignment method, device and system for a millimeter wave communication system. The wave beam alignment device is provided with a high-gain narrow-wave-beam directional antenna and a low-gain wide-wave-beam directional antenna, and comprises a link establishment module and a wave beam alignment module, wherein the link establishment module for establishing a control signaling link with an opposite terminal through the low-gain wide-wave-beam directional antenna, and the wave beam alignment module is used for interacting channel quality information in the different narrow-wave-beam directions with the opposite terminal through the control signaling link and performing wave beam alignment of the high-gain narrow-wave-beam directional antenna with the opposite terminal. If the device serves as a transmitting device, the opposite terminal serves as a receiving device; or if the device serves as the receiving device, the opposite terminal serves as the transmitting device. The system comprises the transmitting device and the receiving device. The wave beam alignment method, device and system can ensure continuity of a link between the transmitting device and the receiving device during wave beam direction scanning, meanwhile the total scanning times is decreased from N2 to 2N, and the time for establishing data transmission connection is greatly shortened.

A communication system providing wireless communication among wireless users through a number of cellular base stations. At least one of the base stations is a mobile base station in which low and high speed wireless transceivers are mounted on a temporarily stationary mobile vehicle such as a truck trailer or a truck. The system includes at least one connecting station with a millimeter wave wireless transceiver in communication with a fiber optic or high-speed cable communication network. The transceiver is adapted to communicate at millimeter wave frequencies higher than 60 GHz with another millimeter wave transceiver at one of the cellular base stations. Each of the base stations serves a separate communication cell. Each base station is equipped with a low frequency wireless transceiver for communicating with the wireless users within the cell at a radio frequency lower than 6 GHz and a millimeter wave wireless transceiver operating at a millimeter wave frequency higher than 60 GHz for communicating with another millimeter wave transceiver at another base station or a millimeter wave transceiver at said at the connecting station. The base stations are also equipped with data transfer means for transferring data communicated through the low frequency wireless transceiver to the millimeter wave wireless transceiver and for transferring data communicated through the millimeter wave wireless transceiver to the low frequency wireless transceiver. In preferred embodiments the system is a part of a telephone system, an Internet system or a computer network.

Methods and apparatus for establishment of a milli-meter Wave (mmW) link communication include initial selection of candidate mmW Base stations (mBs) and configuration of mmW acquisition resources and procedures, both with the assistance of the cellular network. Further methods transmit mmW acquisition beacons, process mmW acquisition beacons to achieve mmW beam alignment and timing synchronization, and uplink (UL) reporting via cellular or mmW links. In an example, a mmW wireless transmit/receive unit (WTRU) transmits millimeter wave (mmW) WTRU (mmW WTRU) information over a cellular system to a base station, receives a candidate list of candidate mmW base stations (mB) including mmW acquisition start timing information and calculates correlation values around the received mmW acquisition start timing information for the mBs in the candidate list. The mmw WTRU performs sliding window correlations by using signature sequences corresponding to mBs and beams in the candidate list.

A method includes measuring beam-formed reference signals transmitted by a plurality of mmWave transmission points (TPs), sending a cloud cell formation request including indicators associated with best mmWave TPs determined in accordance with the measured beam-formed reference signals, receiving a cloud cell formation request response including indicators associated with a subset of the best mmWave TPs selected by a central controller in accordance with selection information, where the subset of the best mmWave TPs includes a first mmWave transmission point (TP) serving as a master TP and a second mmWave TP serving as a slave TP, and establishing a cloud cell with mmWave TPs of the subset of the best mmWave TPs selected by the central controller, where a data connection is established with the slave TP and at least a control connection is established with the master TP.

Aiming at the problem of how to perform multi-user initial access in a plurality of intelligent reflection surface auxiliary millimeter wave communication systems, the invention provides an efficientbeam training mechanism which can achieve the beam alignment of multiple users at the same time with lower training overhead. At first, a wide beam pattern design based on phase adjustment is provided, and a wave width controller capable of flexibly controlling the beam width by adjusting parameters is designed based on quadratic regression; aiming at a new network architecture after introductionof a plurality of reflecting surfaces, the invention provides a beam training strategy based on space-time search, and initial access of a plurality of users can be realized at the same time with relatively low training overhead; in order to accelerate a wave beam training process, new self-adaptive layered codebooks are designed on a base station and an intelligent reflecting surfaces respectively.

The invention discloses a millimeter-wave phase-locked loop, which comprises a voltage-controlled oscillator, an orthogonal output injection locked frequency divider, a charge pump and a loop filter, wherein the voltage-controlled oscillator is used for generating an oscillating signal of a set frequency by adopting a differential input tuning way; the orthogonal output injection locked frequency divider is used for performing frequency division processing on the oscillating signal to output multiple paths of orthogonal frequency division signals; the charge pump is used for converting a pulse signal into an analog voltage signal for realizing differential output; the loop filter is connected between the charge pump and the voltage-controlled oscillator, and is used for filtering an analog voltage signal output by the charge pump to input into the voltage-controlled oscillator. The millimeter-wave phase-locked loop is used for supplying a local oscillator signal of a set frequency to a 60GHz millimeter-wave communication system. According to the structure of the differential tuning voltage-controlled oscillator in the phase-locked loop, the noise of the oscillator is optimized, and the noise optimization of the entire phase-locked loop is facilitated greatly. A differential input control voltage is provided for a differential voltage-controlled oscillator through the charge pump, so that higher phase noise performance is achieved.

A lens-based millimeter wave transceiver for use in wireless communication systems operating in the E-band spectrum consistent with the FCC rules regulating the 71-76 GHz and 81-86 GHz bands. The transceiver includes a single lens adapted for transmission of millimeter radiation to form communication beams in one band of either a band of about 71-76 GHz or a band of 81-86 GHz and for collection and focusing of millimeter wave radiation from communication beams in the other of the two bands. It includes a feed horn adapted to broadcast millimeter radiation through said single lens and to collect incoming millimeter wave radiation collected and focused by said single lens. A millimeter wave diplexer separates incoming and outgoing millimeter wave radiation.

The invention discloses an intelligent wave beam training method and a precoding system in millimeter wave communication, and the intelligent wave beam training method determines a codebook interval where an optimal wave beam is located through sensing the change of an environment by utilizing the space-time correlation of a channel. Specifically, a Markov decision process (MDP) is used for modeling a problem; solution is carried out based on deep reinforcement learning, a graphical state space is innovatively constructed to effectively utilize structural information of a channel beam space, and a differentiated action space is provided to improve learning efficiency and convergence speed. The change rate of the environment can be sensed, and the beam training interval is adaptively adjusted, so that the beam training overhead is reduced, and meanwhile, the throughput of the system is effectively improved.

According to one of the exemplary embodiments, the proposed network entry method is applicable to a user equipment and includes: receiving, within an mmWave band, Q scan beams which have Q IDs over M mmWave time units as each mmWave time unit includes a payload region and a BF header region that includes N BSSs with each of the BSSs corresponding to a different one of the Q scan beams, wherein M, N, and Q are integers greater than 1 and M*N=Q; determining a best beam of the UE based on the BSSs of the Q scan beams; determining a best scan beam of the Q scan beams based on the BSSs of the Q scan beams after determining the best beam of the UE; and transmitting, within the mmWave band, a random access preamble (RAP) by using the best beam of the UE.

The invention provides a novel signal detection scheme aiming at a 60GHz millimeter wave non-linear communication system, wherein the scheme is based on the Bayesian statistical inference mechanism, and capable of effectively solving the problems of system nonlinear distortion and frequency selective multipath fading, and achieving united blind estimate of channel gains and source signals. The method of the detection of the signal of the 60GHz millimeter wave communication system designs an important function applied to the nonlinear system and therefore overcomes the limits of the nonlinear characteristics to the traditional bayes method, further approaches an actual probability distribution function (PDF) through a series of dispersed particles with weights based on the thoughts of the Monte Carlo sequential importance sampling (MC-SIS), and finally utilizes the particle filtering technology to achieve real-time estimating and multi-channel iteration replacement of code element signals (shown in a attached diagram). The method and the device of the detection of the signal of the 60GHz millimeter wave communication system can be applied to the detection of signals of the nonlinear system, improve transmission performance of the system, need no training sequence, and at the same time can achieve the real-time estimating and detection of the signals.

The invention discloses a virtual array antenna based angle estimation method for improving accuracy. The virtual array antenna based angle estimation method is used for a large-scale uniform linear array based millimeter wave communication system, and the sparse characteristics of millimeter wave channels and a compressing reconstruction algorithm are utilized to estimate an antenna transmitting angle and an arrival angle of each channel of multiple channels by adding a plurality of virtual array elements on antenna arrays at the receiving end and the transmitting end. By means of the virtual array antenna based angle estimation method, the angle estimation accuracy can be improved, pilot frequency sequence expenditure can be reduced, and antenna array hardware change is not needed.

The present invention provides a continuous distribution-based angle estimation method and device for improving estimation precision, and belongs to the broadband wireless communication technology and multi-antenna technology field. The device comprises a sending terminal codebook design module, a reception terminal codebook design module and a channel estimation module, and the channel estimation module comprises a pre-processing module and an angle iteration estimator. The pre-processing module decomposes the continuously distributed angle information into the integer multiple sampling angles and the decimal multiple sampling angles in an angle domain, and the angle iteration estimator uses the Turbo decoding principle for reference to realize the angle estimation. The angle estimation method comprises the sending terminal codebook design, the reception terminal codebook design and the channel estimation. The continuous distribution-based angle estimation method and device for improving the estimation precision of the present invention can realize the high-precision angle estimation on a smaller antenna number condition, enables the antenna deployment cost to be reduced greatly, and the algorithm complexity of the angle estimation and the processing time of a reception terminal to be reduced, is suitable for a single-diameter millimeter wave communication system under a large-scale antenna array, and has the very good popularization and application prospect.

Methods, systems, and devices are described for dynamic directional synchronization signal signals in a millimeter wave communication system. A base station may determine a narrowband signal component and a wideband signal component of a synchronization signal for millimeter wave communications. The base station may identify network characteristic(s) of the millimeter wave communication network and adjust parameter(s) of the narrowband signal and/or the wideband signal components of the synchronization signal. The parameters may include a transmission power split or ratio, a bandwidth, a tone selection, or combinations thereof.

The invention provides a high-gain dielectric resonator antenna applied to a 60 GHz millimeter wave communication system, belongs to the technical field of electromagnetic propagation and receiving and provides a high-gain dielectric resonator antenna based on an H-shaped slot fractal uniplanar compact electromagnetic bandgap (HSF-UC-EBG) structure. The specific implementation is that a circle of HSF-UC-EBG structure is loaded around a radiating main body of a dielectric resonator antenna; and the high-gain dielectric resonator antenna is characterized in that the gain in a working frequency range of the antenna is effectively improved under the conditions of keeping size and section of the dielectric resonator antenna unchanged. The designed high-gain HSF-UC-EBG dielectric resonator antenna can be used in the 60 GHz millimeter wave communication system and provides guidance for designing a high-gain antenna which works in a high-frequency system.

The invention discloses a beam allocation method, device and system for a multi-user millimeter wave communication system, and belongs to the technical field of wireless communication. The beam allocation device includes a beam search module, an initialization selection module, a path number determination module, a single path priority determination module, a beam allocation module, a single path user beam allocation module, an adjustment update module, and a circulation termination determination module. The method makes full use of multipath information when different users communicate with a base station and performs beam allocation to users through the base station so that a maximum number of users can be served simultaneously when the base station can allocate mutually different transmission codewords to all service users, and the user rate is greatly increased.

An antenna element includes an antenna radiator, an antenna dielectric substrate, a grounded metal plate, and a feed structure. The antenna radiator consists of several metal sheet units. The coupled slots between the adjacent metal sheet units form radiation slots and the grounded metal plate has a feed slot which is fed by the feed structure and the radiation slot is fed by the feed slot through coupling. This disclosure also provides an antenna packaging structure. An EBG is deployed as part of the radiator to improve the problems of high profile and narrow bandwidth of the traditional antennas. The EBG radiator also achieves low profile, broadband and high gain characteristics that is very suitable for millimeter wave band AiP and is also suitable for mass production at low cost, and therefore it can be widely used in 60 GHz WiFi system and a 5G millimeter wave communication system.

The invention discloses a millimeter wave communication system hybrid precoding method based on zero forcing. The method comprises the steps of establishing a zero forcing precoding matrix according to a channel matrix; decomposing the zero forcing precoding matrix into a product of a unitary matrix and an upper triangular matrix through QR decomposition; matching the unitary matrix in the step 2 through utilization of an array manifold vector and establishing an analog end precoding matrix, wherein elements in the matrix have constant modulus characteristics; obtaining a digital end precoding matrix through utilization of the analog end precoding matrix and the zero forcing precoding matrix, wherein a final hybrid precoding matrix represents the product of the analog end precoding matrix and the zero forcing precoding matrix. In a millimeter wave downlink system of which the number of transmitting antennas is greater than that of receiving antennas, the number of radio frequency links required by the method is the same to that of the receiving antennas. Compared with the traditional ZF precoding of which number of radio frequency links is the same to that of the transmitting antennas, the method has the advantage that the number of the radio frequency links is fewer, so the hardware cost and extra hardware device power cost of the system are reduced.

According to one embodiment of the present specification, a method by which a base station transmits a signal for removing phase noise in an mmWave communication system can be provided, wherein the method for removing phase noise can comprise the steps of: generating a shared PTRS for phase noise of a downlink signal; transmitting, to a terminal, shared PTRS pattern information on the shared PTRS through downlink signaling; and transmitting, to the terminal, the shared PTRS on the basis of the shared PTRS pattern information transmitted to the terminal.

The invention discloses a millimeter waves (MMW) indoor communication system capable of flexibly configuring a guard interval and provides a novel data format modulated by a single carrier. A main principle is that a guard interval pseudorandom sequence substitutes for a data cyclic prefix of a conventional single carrier communication system. Compared with the single carrier communication system using the data cyclic prefix, the system using the data format may prevent a transmitting end from caching data blocks so as to reduce data processing time delay at the transmitting end. Further, the pseudorandom sequence is known data and has good correlation so as to be capable of being used for channel tracking estimation, clock error tracking estimation, and carrier error tracking estimation. In addition, guard interval pseudorandom sequences with different lengths are used for guaranteeing high transmission performance and transmission efficiency of the MMW communication system in different communication environments.