1151 results about "Modulation coding" patented technology

A rate-adaptive method of communicating over a multipath wireless communication system uses multiple links such that each end of a link uses multiple transmit and receive antennas. A number of independent streams that are to be transmitted for each link is determined based on an overall system performance measure. In addition, the system may also jointly determine the best modulation, coding, power control, and frequency assignment for each link, based on an overall system performance measure. In OFDM systems, the number of independent streams, as well as the modulation, coding, and power control, may be determined on a tone-by-tone basis based on an overall system performance measure.

A digital broadcast transmitting and receiving system and a signal processing method thereof that improves the receiving performance of the system. A digital broadcast transmitter can include a randomizer to receive and randomize a data stream into a specified position of which stuff bytes are inserted, a stuff-byte exchange unit to generate known data having a predefined pattern and insert the known data into the specified position of the data stream into which the stuff bytes are inserted, an encoder to encode the data stream output from the stuff-byte exchange unit for an error correction, and a modulator and RF converter to modulate the encoded data stream, RF-convert the modulated data stream and transmit the RF-converted data. The digital broadcast receiving performance can be improved even in an inferior multi-path channel by detecting the known data from the received transmission and using the known data for synchronization and equalization in a digital broadcast receiver.

The invention relates to a DCI (Downlink Control Information) sending method, system and device as well as an transmission uplink method, system and device, relating to the technical field of wireless communication and aiming at solving the problem that a network side is difficult to dispatch a user terminal to carry out uplink transmission because the traditional DCI does not support an LTE-A (Long Term Evolution-Advanced) system in the prior art. The DCI sending method disclosed by the embodiment of the invention comprises the following steps that: the network side generates the DCI used for dispatching the uplink transmission; the network side sends the generated DCI, wherein the DCI comprises the following information: resource indication information, modulation indication information, data indication information, mapping indication information and precoding indication information, wherein the resource indication information is used for indicating the positions of allocated resources; the modulation indication information is used for indicating a modulation coding order of a transmission block; the data indication information is used for indicating whether the transmission block transmits new data or not; the mapping indication information is used for indicating the corresponding relationship of the transmission block and a code word; and the precoding indication information is used for indicating the size of an uplink transmission order and an index of a used precoding code word. The DCI sending method can be used for enhancing the efficiency of the uplink transmission.

An apparatus and method for determining a modulation order of packet data to be transmitted through a subcarrier in a transmission apparatus. In the apparatus and method, transmitter physical channels encode and modulate data to transmit the user data with OFDM symbols. A controller outputs packet data to the transmitter physical channels, and determines the number of transmission slots, the number of OFDM symbols, the number of subchannels, and a size of an encoder packet. A modulation order and code rate decider receives, from the controller, the number of transmission slots, the number of OFDM symbols, the number of subchannels, and a size of an encoder packet, calculates a Modulation order Product code Rate (MPR), determines a modulation order according to the MPR, and outputs the determined modulation order to a corresponding physical channel.

The present description relates to a method for a terminal to transmit uplink (UL) data in a wireless access system, comprising the following steps: receiving uplink resource allocation information for uplink data transmission from a base station via a downlink control channel, wherein the uplink resource allocation information includes resource block allocation information for each slot of a subframe and modulation and coding scheme (MCS) information; receiving, from the base station, sequence information allocated to each terminal so as to transmit uplink data through a code division multiplexing (CDM) scheme in cooperation with other terminals in a resource block pair region of the subframe; and transmitting uplink data to the base station through the resource block pair region in accordance with the received sequence information.

The embodiment of the invention discloses a method and equipment for determining multi-cell channel information. Multi-cell channel quality information fed back by a terminal, channel state information between each cell and the terminal and interference information of each cell to the resource information distributed by the terminal are utilized in a base station, and then user scheduling, interference coordination and modulation and coding mode selection are performed so as to improve the throughput and processing efficiency of multi-cell combined processing.

The invention discloses an interference measurement signaling notification method which comprises the following steps: a network side notifies M subframes information contained in a subframe set of interference measurement or a channel quality measurement subframe set to a terminal. The invention discloses an interference measurement method which comprises the following steps: the terminal receives an notification of subframe set of interference measurement or channel quality measurement subframe set information sent by the network side, carries out interference measurement on each subframe in the subframe set of interference measurement or channel quality measurement subframe set, and calculates an average interference value; the terminal determines CQI (channels quality indication) information according to the average interference value, and sends the interference value back to a base station. The invention discloses a channel quality information feedback method which comprises the following steps: the terminal appoints a subframe to carry out interference measurement at the base station, determines CQI according to a measurement result, and sends the CQI back to the base station. The invention discloses apparatuses for realizing the above methods. In the invention, the base station can accurately determines a modulation coding mode of the terminal according to the interference measurement result, and data transmission efficiency is raised.

Coordination and synchronization is performed between two or more wireless network managers (e.g., access points (APs)). A first wireless network manager supports first communications with first other wireless communication devices, and a second wireless network manager supports second communications with those first and / or second other wirelessly case devices. The first and second wireless network managers also support communications with one another to coordinate the first and second communications supported with the first and / or second other wireless communication devices. Examples of coordination include selection of which other wireless communication devices are serviced or in communication with which of the first and second wireless network managers, selection of operational parameters (e.g., modulation coding set (MCS), beamforming, frequency band assignment, channel assignment, scheduling information, transmit power, etc.) for the first and second wireless communication devices, synchronization to a common clock (e.g., using timing synchronization function (TSF)).

The application discloses a mobile communication system and a terminal direct unicast transmission control method. The method includes the following steps: a first terminal sends a first type of sub-link control signaling, including a first terminal identifier, a second terminal identifier, a resource allocation identifier and a modulation and coding identifier; a second terminal receives a sub-link data signal, and generates a channel quality indicator and re-transmission request information; the second terminal sends a second type of sub-link control signaling to the first terminal, including the second terminal identifier, the first terminal identifier, the channel quality indicator and the re-transmission request information; the first terminal receives the second type of sub-link control signaling, and identifies the second terminal identifier, the first terminal identifier, the channel quality indicator and the re-transmission request information; and the modulation and coding identifier is determined according to the channel quality indicator, and the sub-link data signal is re-transmitted. The mobile communication system includes a base station and at least two terminals. Compared with the prior art, by adopting the scheme of the invention, the transmission reliability can be ensured, the data rate can be increased, and the communication efficiency and security can be improved.

The invention discloses a multi-input multi-output system, a data transmission method and a data transmission device thereof, which are used for improving the throughput of uplink data transmission inthe multi-input multi-output system. The method comprises that: a user terminal side performs corresponding modulation and coding on a data stream to be transmitted according to received modulation and coding scheme MCS information determined by a base station side, and inserts a user dedicated demodulation reference signal into each data stream to be transmitted respectively; downlink channel estimation is performed, and according to downlink channel information obtained by the estimation, eigenvalue decomposition is performed to obtain a corresponding pre-coding matrix which is used as an uplink pre-coding matrix; and the uplink pre-coding matrix is adopted to pre-code the data stream inserted with the user dedicated demodulation reference signal, and then the pre-coded data stream is transmitted to the base station side. The method and the device fully utilize uplink channel state information to obtain the spatial diversity gain of a plurality of antennae and improve the throughputof the uplink data transmission.

Variable modulation within combined LDPC (Low Density Parity Check) coding and modulation coding systems. A novel approach is presented for variable modulation encoding of LDPC coded symbols. In addition, LDPC encoding, that generates an LDPC variable code rate signal, may also be performed as well. The encoding can generate an LDPC variable code rate and / or modulation signal whose code rate and / or modulation may vary as frequently as on a symbol by symbol basis. Some embodiments employ a common constellation shape for all of the symbols of the signal sequence, yet individual symbols may be mapped according different mappings of the commonly shaped constellation; such an embodiment may be viewed as generating a LDPC variable mapped signal. In general, any one or more of the code rate, constellation shape, or mapping of the individual symbols of a signal sequence may vary as frequently as on a symbol by symbol basis.

The present invention relates to a method of determining a Modulation and Coding Scheme (MCS) feedback in a Wireless Local Area Network (WLAN) system, including an MCS FeedBack (MFB) responder receiving a first frame, including a request message requesting to send the MFB, from an MFB requester and the MFB responder sending the MFB, including a recommended MCS value, to the MFB requester. The recommended MCS value is derived with reference to at least one of unsolicit type information indicative of a type of the MFB, transmit type information indicative of a transmission type of data, coding type information indicative of a coding scheme applied to the data, a group ID indicative of a group of target stations (STAs) to which the data will be transmitted, and MFB bandwidth information indicative of a bandwidth of a channel.

The embodiment of the invention discloses selection method and device of a modulation encoding mode, wherein the method comprises the following steps: selecting object primary transmission block errorrate (IBLER) from a layer-two system level according to the combined gain of a hybrid automatic retransmission request (HARQ); obtaining an SINR adjusted quantity by a signal-to-interference and noise ratio (SINR) correction algorithm according to the object IBLER; utilizing the SINR adjusted quantity to adjust the original SINR to obtain a modified SINR; and selecting a modulation code combination MCS corresponding to an SINR operation interval into which the modified SINR falls. The spectrum effectiveness for receiving a signal can be improved according to the embodiment of the invention.

The invention discloses a downlink data transmission method, a downlink data transmission system and downlink data transmission equipment, which relate to the field of wireless communication and are used for improving data transmission reliability and saving air-interface resources. The method comprises that: a base station allocates physical resource blocks (PRB) to a terminal according to channel quality indicator (CQI) information reported by the terminal and the current volume of downlink data to be transmitted; the base station determines a first modulation and coding scheme (MCS) level, wherein the first MCS level is lower than a second MCS level which is an MCS level determined according to signal-to-interference and noise ratios (SINR) on each PRB allocated to the terminal; the base station searches for an MCS form and a transport block size (TBS) form to obtain a TBS corresponding to the first MCS level and the total number of the PRBs allocated to the terminal; and the base station transmits the downlink data of the TBSs to the terminal by utilizing the PRBs allocated to the terminal. By the method, the system and the equipment, the data transmission reliability can be effectively improved, the repeat probability of a hybrid automatic repeat request (HARQ) can be reduced, and the wasting of air-interface resources can be effectively reduced.

A method of improving sound quality of audio signals that are digitally processed includes steps of extracting amplitude and frequency modulations from one or more narrow bands of the audio signal, and filtering and compressing those modulations to produce amplitude and frequency modulated audio signals that are digitally processed to provide an acoustic signal similar to the original audio signal. The methods may be used in auditory prostheses and telecommunication systems.

The invention discloses an uplink power control method and an uplink power control system. The method comprises that: a base station configures a target received power parameter and a path loss compensation factor parameter corresponding to a reference service rate, regulates a power transmission enabling parameter (deltaMCS) according to the grade of a modulation and coding scheme (MCS) and transmits the deltaMCS to a terminal; and the base station subtracts target received power and path loss compensation from a transmitted power limit of the terminal to obtain power allowance, determines an available MCS grade of the terminal according to the power allowance and transmits the determined available MCS grade to the terminal. In the method and the system, the base station is supported to adaptively select an MCS grade suitable for user equipment (UE), and effective control over the uplink transmitted power of the UE is realized.

A power controllable wireless mobile communications system using an adaptive modulation and coding scheme includes a signal-to-noise ratio (SNR) extracting unit which extracts a SNR from a received signal that is processed using a predetermined first modulation and coding scheme; a modulation and coding scheme determining unit which compares the extracted SNR with a first requested SNR for the received signal and determines a second modulation and coding scheme; a power control value determining unit which compares the extracted SNR with a second requested SNR for a signal of the second modulation and coding scheme and determines a power control value; and a signal generating unit which inserts a field indicating the second modulation and coding scheme and a power control command field for the power control value, into data to be transmitted, processes a resulting signal according to the second modulation and coding scheme, and generates a transmission signal.

The present application relates to the field of wireless communications, and in particular, to an indication method and device for a modulation coding scheme. It is for solving the problem that in an existing LTE / LTE-A system, a higher-order modulation scheme cannot be supported, thereby limiting the further improvement of throughput in an application scenario of a high signal-to-noise ratio. The method of the embodiments of the present application includes: according to the channel quality and a first MCS table, a network side determining an MCS level corresponding to a channel scheduled for a UE; and by means of first indication information, notifying the UE of the determined MCS level, so as to indicate to the UE to determine a modulation scheme and code rate for the channel scheduled therefor according to the MCS grade, wherein there are at least corresponding entries of MCS indexes and TBS indexes corresponding to modulation schemes at higher modulation orders than 6 in the first MCS table. The embodiments of the present application introduce a higher-order modulation scheme into an existing LTE / LTE-A system, improving the spectrum efficiency.

The embodiment of the invention discloses a method of reporting feedback information, which comprises the following steps: user equipment UE reports channel quality indicator CQI feedback value to a base station, the CQI feedback value is carried by enhanced specialized transmission channel media access control protocol data unit MAC-i PDU or high speed downlink shared channel specialized physical control channel HS-DPCCH. By the embodiment of the invention and the CQI feedback value carried by MAC-i PDU or HS-DPCCH and reported to the base station by UE, the CQI feedback value can be rapidly and directly reach the base station, thereby saving the processing resources of RNC and transmission resources of IUB port and the base station can timely and accurately determine downlink modulation coding mode and transmitting power according to the CQI feedback value.

The invention discloses an uplink power control method and a system of an LTE (Long Term Evolution) system, wherein the method comprises the following steps: the average interference lower limit M of user equipment on a neighbor area is determined by a base station, the average interference upper limit M' of the user equipment on the neighbor area is allocated by the base station, and then a link loss compensation coefficient beta of the base station is determined according to the average interference upper limit and the average interference lower limit of the user equipment on the neighbor area and the link loss of the user equipment; power authorized delta'TF(i) on a unit resource block when the neighbor area is interfered is computed and considered by the base station according to the link loss compensation coefficient beta, and then resource block number MPUSCH(i) occupied by a physical uplink shared channel (PUSCH) and a modulation coding mode are obtained according to the power authorized delta'TF(i); the difference f(i) of the resource block number, the modulation coding mode, the actual signal to interference and noise ratio and the target signal to interference and noise ratio is issued to the user equipment through uplink authorization, the deltaTF(i) is obtained through computation and lookup by the user equipment according to the resource block number and the modulation coding mode, and then the transmission power is adjusted by the user equipment according to the deltaTF(i), the f(i) and the MPUSCH(i).

Disclosed is a method to operate an orthogonal frequency duplex multiplexing (OFDM) communications system, and an OFDM system that operates in accordance with the method. The method includes, when transmitting data over a plurality of OFDM sub-channels from an OFDM transmitter (12A) to an OFDM receiver (12B) through a channel (24), operating an adaptive learning automaton (50) to adjust values of modulation coding scheme (MCS) switching thresholds so as to maximize at least one selected performance criterion; based on the values of the switching thresholds, selecting a MCS and modulating data with the selected MCS and transmitting the modulated data over at least some of the sub-channels. The method further includes receiving the data at the OFDM receiver and demodulating the received data using a demodulator that corresponds to the selected MCS.

The invention provides a method for solving uplink power control aiming at an uplink adopting MIMO transmission mode. The uplink transmitting power depends on the size of transmission block (or modulation coding scheme MCS), path loss, precoding vector type, bandwidth and base station expected receiving power (or signal to noise ratio) and the like. Uplink multi-antenna transmission is utilized, so that the base station obtains certain array gain and user equipment can correspondingly reduce uplink transmitting power; each transmission block of uplink transmission can share the same MCS parameter, the same array gain parameter or the same power adjusting parameter, or each transmission block has respective MCS parameter, array gain parameter and power adjusting parameter; under the conditions that the uplink adopts space multiplexing and CMP precoding vector is utilized, the actual transmitting power of antenna depends on the transmitting power of the layer where the antenna is transmitted; under the conditions that uplink adopts space multiplexing and CMF precoding vector is utilized, the transmitting power of antenna depends on the sum of transmitting powers of each layer where the antenna is transmitted actually, and the base station configures maximum transmitting power of each layer in a semi-static or dynamic way.

Apparatus, and an associated method, for facilitating transmission of block-formatted data by an EDGE-capable mobile station. When the mobile station is instructed to use an MCS-8 modulation coding scheme, in initial transmission of the data, the mobile station determines the amount of data that is to be transmitted. If only a single RLC block is to be transmitted at MCS-8, MCS-6 is instead utilized. And, padding bytes are added to the MCS-6 data blocks.

An adapting method of channel includes carrying out estimation on state of current channel by user terminal for obtaining CQI data, adjusting CQI data according to preset revision parameter and sending adjusted CQI data to base station, selecting modulation coding mode by base station according to adjusted CQI data and send data to user end. The device used for realizing said method and another adapting method of channel are also disclosed.

A mobile communications system can easily set the optimum threshold for use in selecting a modulation-coding mode depending on a link condition. A selection control unit compares the reception quality of a common pilot signal detected by a mobile station with a plurality of thresholds stored in a threshold table, determines a modulation-coding mode to be selected, and outputs the determination result as a switch instruction. A threshold variable control unit variably controls the threshold level indicating the range of the link quality corresponding to the currently used modulation-coding mode based on the contents of the reception error notification from the mobile station.

The invention discloses a data processing method, a base station and a terminal. The data processing method comprises the steps that: the base station determines to use an unauthorized carrier to carry out data transmission and notifies scheduling information to UE; further, the UE judges that the base station pre-schedules the UE, the UE carries out modulation coding according to the scheduling, and meanwhile, the base station preempts an unauthorized carrier resource; and the UE sends data with modulation coding finished on the preempted unauthorized carrier resource. By adopting the data processing method provided by the technical scheme of the invention, when the base station determines to carry out the data transmission on the unauthorized carrier, and if the unauthorized carrier is not preempted temporarily, when preempting the unauthorized carrier, the UE carries out the modulation coding according to the scheduling, in this way, after the unauthorized carrier resource is preempted, a data transmission process on the unauthorized carrier resource can be carried out immediately or soon, so that the limited occupation time of an unauthorized frequency spectrum is fully used, and the utilization rate of the preempted unauthorized carrier resource is improved.

The invention provides a downlink self-adaptive method; wherein, a resource block group (RBG) corresponding to a sub-band channel quality indicator (CQI) of good quality is used for sending data scheduled to UE. When the RBG corresponding to the sub-band CQI does not meet the requirement of data amount, the RBGs corresponding to the sub-band CQI and a part of broad band CQI are jointly used for sending the data scheduled to the UE; however, when both the RBG corresponding to the sub-bond CQI and the RBG corresponding to the broad band CQI do not meet the requirement of the data amount, the sub-band CQI and all RBGs corresponding to the broad band CQI are used for sending a part of the data scheduled to the UE. Furthermore, when the TBz can be sent by the RBG corresponding to the sub-bond CQI is less than the TBz can be sent by the RBG corresponding to the broad band CQI, the RBG corresponding to the sub-bond CQI is used for sending the data scheduled to the UE. Under the feedback of UE selective sub-band CQI, the method of the invention not only adopts a single code modulation mode for each data stream, but also obtains comparatively high downlink throughput rate.