66results about How to "Reduce block error rate" patented technology

To decode a representation of a codeword that encodes K information bits as N>K codeword bits, messages are exchanged between N bit nodes and N−K check nodes of a graph in which E edges connect the bit nodes and the check nodes. While messages are exchanged, fewer than E of the messages are stored, and/or fewer than N soft estimates of the codeword bits are stored. In some embodiments, the messages are exchanged only within sub-graphs and between the sub-graphs and one or more external check nodes. While messages are exchanged, the largest number of stored messages is the number of edges in the sub-graph with the most edges plus the number of edges that connect the sub-graphs to the external check node(s), and/or the largest number of stored soft estimates is the number of bit nodes in the sub-graph with the most bit nodes.

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.

The invention discloses a decoding method of wireless channel and application for it, when decoding for wireless signal, according to the output characteristics of low density parity check code LDPC decoding chooses the external code; when sending wireless signal, first codes for the signal via said external code, and then codes the signal via LDPC coding; when receiving wireless signal, first decodes it via LDPC, and the decodes according to external code. The invention also discloses a decoding device for wireless channel and the application for it, the system in invention includes: coding device and decoding device. Using the invention, it can improve the preciseness of decoding for wireless channel effectively.

The invention discloses a method and device for generating a channel quality indicator. The method includes an inner loop processing process and/or an outer loop processing process. In the inner loop processing process, a predicted value of a signal to noise ratio can be acquired according to a measured value of the signal to noise ratio and a change rule of the signal to noise ratio, and then a first CQI value can be acquired. In the outer loop processing process, a CQI offset is acquired according to the relationship between the size of an estimated value of a block error rate and the size of a threshold value of the block error rate. A second CQI value can be acquired according to the first CQI value and the CQI offset. Besides, a modulation method can be selected to finish a complete CQI report. With the method, channel quality at the moment when the CQI report becomes valid can be better matched, the block error rate can be effectively controlled, therefore, feedback gain of the CQI can be greatly improved, and the throughput rate and service delay of a terminal can be obviously improved.

The invention provides a method for determining a downlink transmission MCS (Modulating and Coding Scheme), which comprises the following steps of: A, recoding a downlink transmission result fed back by a user within a BLER (Block Error Ratio) statistical length, generating a transmission result record list for the user; B, calculating the BLER according to content recorded in the transmission result record list for the user; C, regulating the MCS according to the calculated BLER. With the technical scheme of the invention, the MCS is regulated according to a BLER value without occupying extra uplink transmission resources, and further, a uplink transmission capacity of a system is increased. Effects of fast drop and slow rise can be achieved while the MCS is regulated, thus, a lower BLER during an entire transmission process can be ensured, and the BLER is in an acceptable range. The method is suitable for the system having a slow channel change environment and a fixed terminal position.

In a pilot signal transmission method for raising the SIR measurement accuracy for transmission power control during high-speed transmission and thus reducing the block error rate and improving the throughput, a first SIR value measured by first pilot signals and second SIR value measured by second pilot signals are first compared, and the presence or absence of second pilot signals then determined in slot units based on the comparison results. When the second pilot signals exist, the second pilot signals are used in addition to the first pilot signals in the SIR measurement for high-speed closed-loop transmission power control. When the second pilot signals do not exist, only the first pilot signals are used in the SIR measurement for high-speed closed-loop transmission power control.

The embodiment of the invention discloses a method and a device which are used for obtaining symbol mapping diversity, generating a star map and modulating. The modulating method comprises the following steps: a same modulating way is adopted for modulating a bit stream which is input in each layer, thus obtaining a modulating symbol, and the bit stream is a data stream of the same business of the same user; phase deflection of the modulating symbols which are output by at least two layers is implemented according to different phase deflecting factors; and superposition of the modulating symbols of each layer, which are output after the phase deflection, is implemented. The symbol mapping diversity obtaining method comprises the following steps: feedback detecting error information of a transmission signal that is sent by a receiving terminal is received, and retransmission is launched; angle rotating superposition of the basic modulating symbol corresponding to the transmission signal is implemented according to the information, thus obtaining a retransmission signal, and the rotating superposition angle of the retransmission signal is different from the rotating superposition angle of the transmission signal; and combined treatment of the transmission signal and the retransmission signal is implemented, thus obtaining the symbol mapping diversity. The modulating method and the symbol mapping diversity obtaining method of the embodiment can decrease the block error rate of the receiving terminal and eliminate the interlayer interference during retransmission.

The invention provides a method for designing an eight-antenna codebook based on an LTE-Advanced system, comprising the following steps: determining codon quantity of a codebook which comprises 16 codons under the condition of each order; reusing an LTE R8 four-antenna HH codebook and obtaining a pre-encoder matrix by carrying out kcronecker product on the codons in the codebook and a unitary matrix and working out an LTE-Advanced eight-antenna codebook of an even order by transmitting power of the pre-encoder matrix; and deleting a row of column vectors in the even order codons, generating a pre-encoder matrix, carrying out normalization of emitted energy on the pre-encoder matrix and obtaining an LTE-Advanced eight-antenna codebook of an odd order. The invention not only keeps LTE-Advanced backward compatibility, but also naturally inherits a plurality of excellent characters of the LTE R8 codebook by reusing the LTE R8 four-antenna HH codebook, thereby effectively reducing CQI calculation of a terminal side and complexity of codon selection and avoiding unbalance of the transmitting power.

The invention provides a resource allocation method for channel condition optimization in NOMA of a low-density code and belongs to the field of wireless communication. According to the method, a resource allocation method capable of maximizing the system sum rate is provided to match the phenomenon that different channel conditions exist between users; that is, through the channel condition information of the user obtained by a base station, the optimization problem of maximizing the sum rate is established under the condition that the sparsity constraint and the power constraint are guaranteed; the non-convex optimization problem is converted into a series of convex problems, which are solved through an iterative algorithm; and an approximate optimal RE mapping and power distribution scheme is obtained. Compared with an existing resource allocation method, the sum rate of the low-density code NOMA system is improved; and the block error rate (BLER) performance is improved.

The method comprises: 1) the receiving end uses the constellation diagram to make the mapping for the received signals to get the final symbol, and makes the final symbol saturation operation for the final symbol; 2) confirming each level of preset threshold of soft bits demodulation modulated by M-ary of orthogonal amplitude modulation; according to the final symbol after confirming the threshold and completing the saturation operation, calculating each bit of the final symbol. The invention solves the issue of low data transmission efficiency caused by the increasing of block-missed rate at receiving end and by making complex calculation at receiving end.

Provided in an embodiment of the present invention are a data packet transmission method and system, user equipment (UE) and eNB, the method comprising: the UE receives the process configuration message of a first process transmitted by the eNB; according to the process configuration message, bundling the first process with at least one second process; and transmitting the same data packet on the first process and the at least one second process. The technical solution employed in the embodiment of the present invention increases the processes transmitting the same data packet, reduces the block error rate of an eNB during uplink data packet reception, and further enhances uplink coverage especially in the edge area of an LTE system by reducing the block error rate of the uplink data packet.

The invention provides a channel and interference measurement method and device. The method comprises the following steps: receiving a first group of reference signal resources; and measuring a channel and interference corresponding to at least one first reference signal resource in the first group of reference signal resources. The channel and the interference corresponding to the first referencesignal resource are measured based on the quasi-common-site QCL information of the first reference signal resource. According to the method and the device, a measurement result capable of better reflecting the signal quality of a beam corresponding to the first reference signal resource can be obtained, so that the network device selects the ideal beam for sending the signal or the channel to theUE, the throughput rate is improved, and the block error rate is reduced.

Embodiments of the invention relate to the technical field of communication, and specifically relates to coding and decoding methods and apparatuses of a polar code. The coding method includes steps:segmenting a to-be-coded information sequence according to a segmentation policy confirmed by both transmitting and receiving parties, and generating I segmentation sequences mi; for any segmentationsequence mi, generating a first verification sequence according to the segmentation sequence mi and a first encoder corresponding to the segmentation sequence mi, and combining the segmentation sequence mi and the first verification sequence to form a first code word sequence; and combining I first code word sequences to obtain a second code word sequence, and performing polar code coding on the second code word sequence. Any segmentation sequence mi is verified during decoding, the decoding is terminated if the verification is not passed, the verification is not performed after the whole information sequence is obtained through decoding, the false alarm rate and the block error rate can be reduced, and the time delay of decoding can be reduced.

The invention relates to a power control method based on zero-approach judgment feedback check, wherein it is characterized in that: under the rule of minimize block error rate, calculating power distribution matrix, via part feedback signal channel that only feedbacks power information, decomposing the multiple between signal channel matrix and the power matrix into one unitary matrix and one upper triangle matrix; using power matrix weighted to send signal, to make the decomposed upper triangle matrix with constant diagonal line, and optimizing the check sequence and check property of zero-approach judgment feedback check, to reduce the average bit error rate and the block error rate. The invention can reduce the complexity, the average bit error rate and block error rate.

The invention provides a method and a device for updating a channel quality indicator. The method for updating the channel quality indicator mainly comprises the following steps: confirming an assessment valve of an inter-cell interference power corresponding to a user experience (UE) according to a channel state information (CSI) feedback by the UE and a precoding matrix of a collaborative cell, wherein the assessment valve of the inter-cell interference power corresponding to the UE is greater than or equal to a true valve of the inter-cell interference power corresponding to the UE; confirming a signal power corresponding to the UE according to the CSI feedback by the UE; carrying out channel quality indicator updating according to the assessment valve of the inter-cell interference power corresponding to the UE and the signal power corresponding to the UE; and carrying out user scheduling for the UE according to the updated channel quality indicator. According to the method for updating the channel quality indicator, phenomenon that the channel quality indicator of the UE is over estimated is effectively avoided, so that the block error rate in data transmission is greatly reduced.

The present invention discloses a method for signal transmission and a user equipment (UE), wherein said method comprises: user equipment UE calculating an MSE of a first layer of signal and an MSE of a second layer of signal; the UE selecting a pre-coding matrix from a plurality of pre-coding matrices according to the sum of the MSE of the first layer of signal and the MSE of the second layer of signal; and the UE informing a base station to use the selected pre-coding matrix to transmit signals. By way of the present invention, the correct transmission of signals is ensured, the block error rate of the system is reduced, and the throughput of the system is improved.

According to some embodiments, a method performed by a wireless device for polar encoding payload bits comprises: identifying payload bits of a data channel that have known values; placing a first subset of the known payload bits at input positions of a polar encoder that correspond to the earliest decoding bit positions of the polar encoder; placing a second subset of the known payload bits at input positions of the polar encoder that correspond to the least reliable decoding bit positions of the polar encoder after placement of the first subset of the known payload bits; and transmitting the polar encoded payload bits to a wireless receiver. The first subset of the known payload bits are placed in earliest decoding bit positions to improve early termination gain. The second subset of the known payload bits are placed in least reliable decoding bit positions to enhance error performance.

The invention relates to the technical field of wireless communication, in particular to a method and a device for allocating physical resource blocks. The device and the method are used to solve the problems of increase in an error block rate of data at a receiving terminal and reduction in the resource utilization rate and user capacity of the communication system of a cell, which are caused by the high multi-access interference generated by the method for allocating the physical resource blocks in the prior art under the influence of a smart antenna. The method of the embodiment of the invention comprises: determining the region of a cell of a terminal according to the directional angle of an incoming wave of a terminal, wherein the region is one of the plurality of regions of cells; determining the physical resource block corresponding to the terminal according to a preset mapping relationship between region identifiers and physical resource blocks; and sending the parameters of the determined physical resource block to the terminal. The method of the embodiment of the invention can reduce multi-access interference in the same cell and the error block rate of the receiving terminal and improve the resource utilization rate and user capacity of the communication system.

The invention discloses a multi-path tracking method and device. The method comprises the steps of searching the positions of multiple paths and expanding a certain number of paths in front of and behind the positions of the multiple paths, acquiring the signal to interference ratio of each expanded path and selecting paths needing to be combined according to the signal to interference ratio of each path, carrying out maximal-ratio combining on the symbol level data of the selected paths needing to be combined, and taking the positions of the selected paths needing to be combined as the multi-path tracking positions. According to the multi-path tracking method and device, the problem that multiple path position searching carried out according to correlation technique is high in error is solved, multiple path position searching accuracy is higher, the block error rate of large transmission blocks is reduced, the peak rate of uplink transmission is increased, and extra gain of multiple path combination is obtained.

The invention discloses a DCI transmission and reception method and a device, a storage medium, a base station and a terminal, and the method comprises the steps: obtaining a to-be-transmitted codeword, and enabling the to-be-transmitted codeword to be correlated with DCI; dividing the code words according to the number of the PDCCHs to obtain a plurality of sub-code words, the number of the sub-code words being equal to the number of the PDCCHs, and the sub-code words being in one-to-one correspondence with the PDCCHs; and for each sub code word, mapping the sub code word to the correspondingPDCCH. According to the scheme of the invention, the DCI can be transmitted by fully utilizing channel conditions of different PDCCHs, so that the BLER performance of PDCCH decoding is better reduced, the decoding gain is improved, the decoding correctness is improved, and the requirement of URLLC on reliability is better met.