Zte Corporation

Xi'an Zhongxing New Software Co., Ltd.

Hongfeng Qin

Bin Li

Ping Li

Lei Li

Shaopeng Wang

Gaocai Xiong

Xiaoxiao Liu

Yajun Zhao

Xin Hui Zhang

Yunfeng Sun

Hanqing Xu

Qian Wang

Wei Lin

Xue Wang

Chen Huang

Linmei Mo

Yujie Li

Yuting Zhang

Xin Zhang

Baoyu Sun

Zhaohua Zeng

Hongzhi Zhao

Yue Xiao

Hai Bo Jiang

Peiyan Fei

Peng Geng

Guofeng Chen

Wenfang Wang

Fan Shi

Hongfeng Yuan

Weiju Sun

Lujia Han

Jie Lei

Guomei Zhang

Dengsheng Lin

Xuelei Lv

Guobing Li

Haihong Chen

Fengqi Kang

Cunlei Bi

Yingyu Zhang

The disclosure discloses a method and device for forming a multi-cell beam. The method includes: a beam forming vector bof each coordination cell in a heterogeneous network is calculated according to a principle of maximizing a signal intensity of a coordination cell scheduling user and minimizing a weighted interference leakage of the coordination cell scheduling user to other coordination cell scheduling users; and the beam forming vector bof corresponding coordination cell is updated according to a calculation result, to enable each coordination cell to transmit data to a corresponding scheduling user according to updated beam forming vector b.

Method and device for forming multi-cell beam

A method and device for detecting a signal of an LTE uplink system in an interference condition. The method comprises: receiving baseband signals of M receiving antennas, and after fast Fourier transform, conducting demapping to obtain frequency-domain baseband signals; extracting a DMRS inserted in a received signal of each antenna, and then, calculating a channel gain hof each receiving antenna; combining the baseband signals and the channel gains of the M receiving antennas to obtain a signal matrix Yand a gain matrix H; calculating an interference noise covariance matrix Ron each subcarrier; conducting interference pre-processing on a received signal on each combined subcarrier to obtain the received signal (1) and the channel gain (2) after the interference pre-processing, where D=R; and according to (3), conducting frequency-domain balancing on the received signal after the interference pre-processing.

Method and device for detecting signal of LTE uplink system in interference condition

A coordinated beamforming method and apparatus based on partial interference alignment, the method includes: selecting an optimal partial interference alignment mode from selectable partial interference alignment modes of terminals covered by base stations in a coordinating cluster of a coordinated multiple points transmission according to a chordal distance criterion; and transmitting, by the base stations, signals to the terminals by adopting the optimal partial interference alignment mode.

Coordinated beamforming method and apparatus based on partial interference alignment

Disclosed are a multi-antenna transmission method, a terminal and a base station, wherein, an eNB sends a UE a SRS transmission mode including new SRS transmission port information and/or a signaling for instructing the UE to perform antenna group alternate transmission as well as a control signaling required by the SRS transmission mode; the UE transmits a SRS using the abovementioned SRS transmission mode, and the eNB estimates a channel information according to the SRS and calculates and transmits a precoding matrix.

Multi-antenna transmission method, terminal and base station

The present disclosure provides a method for detecting a random access signal. The method includes: determining a temporary peak detection sequence according to a received time domain random access signal; determining an interference cancellation weight for a frequency domain cyclic shift sequence corresponding to a search window in the temporary peak detection sequence, and performing interference cancellation on the temporary peak detection sequence according to the interference cancellation weight, obtaining a final peak detection sequence; and performing peak detection on the final peak detection sequence. The present disclosure discloses an apparatus and system for detecting a random access signal at the same time. According to the method, the present disclosure can eliminate the deterioration of the leak detection performance and the false detection performance caused by the interference during the random access signal detection, improve the detection accuracy and save resources.

Method, apparatus and system for detecting random access signal

A method and device for selecting a heterogeneous network serving cell based on inter-cell cooperation, which relate to the field of digital communications. The method disclosed in the embodiments of the present invention comprises: acquiring, by a central node base station in a heterogeneous network, alternative users in each cell in the heterogeneous network; and according to a pre-set alternative user selection criterion, selecting an alternative user in the entire network from the alternative users in all cells in the heterogeneous network; and if the alternative user in the entire network needs to conduct a reselection operation, initiating a cell reselection flow. Also disclosed is a device for selecting a heterogeneous network serving cell based on inter-cell cooperation corresponding to the method.

Method and device for selecting heterogeneous network serving cell based on inter-cell cooperation

A method and base station for coordinated multi point data transmission are disclosed. The method includes: a base station receiving a per-cell CQI value reported by a UE; looking up an SINR-CQI mapping table according to the per-cell CQI value, and acquiring a subband/broadband SINR value; performing CQI recalculation according to the subband/broadband SINR value, and acquiring a recalculated subband/broadband CQI value; and selecting modulation and coding according to the recalculated subband/broadband CQI value to schedule data transmission. With the method and base station of the embodiments of the present document, in a CoMP system, in a joint transmission scenario, the accuracy of the CQI value used by the BS for scheduling is improved, and the oscillation during an AMC process is reduced.

Method and base station for coordinated multi point data transmission

A random access method and random access system for a terminal in a high-speed mobile environment are provided. Wherein, the method comprises: selecting a random access preamble format according to a preset cell coverage radius target value; judging whether using a restricted set of cyclic shift quantities pre-configured satisfies a requirement of the cell coverage radius target value under the selected random access preamble format; if not satisfying, selecting a cyclic shift quantity which satisfies the requirement of the cell coverage radius target value from a unrestricted set of the cyclic shift quantities pre-configured; and generating a random access signal according to the cyclic shift quantity and a pre-configured mother code, and performing access using the random access signal. Through the above-mentioned technical scheme, the embodiment of the present document provides a more perfect random access method and random access system for a terminal in a high-speed mobile environment.

Random access method and random access system for terminal in high-speed mobile environment

A method for acquiring a format of a random access subframe and a receiver are provided. The method includes: according to a cell radius supported currently and a cell coverage radius decided by the length of ZC sequence and the size of Ncs, a receiver determining the length of preamble sequence in an extended random access subframe; according to the cell radius supported currently and a cell coverage radius decided by the length of GT, determining the lengths of CP and GT in the extended random access subframe; according to sampling rates of a system where the receiver is located and the lengths of the preamble sequence and CP and GT, respectively calculating the numbers of sampling points of preamble sequence and GT and CP; based on the above numbers of sampling points, calculating the length of extended random access subframe, and determining the format of extended random access subframe.

Method for acquiring format of random access subframe and receiver

The embodiments of the present document provide a random access method and a receiver, wherein, the random access method includes: after starting up, a receiver performing cell search and downlink synchronization to obtain a time reference; the receiver obtaining a distance between itself and a base station; the receiver selecting a random access format according to parameters and a load condition of the system where it is located; the receiver obtaining a cell radius supported by the selected random access format, and calculating a line-of-sight transmission time delay if the cell radius is less than the distance; and based on the time reference, the receiver transmitting a random access subframe the line-of-sight transmission time delay in advance.

Random access method and receiver

Disclosed are a method and device for estimating a channel in a multiple-receiving antenna system. The method comprises: a channel estimation is performed on a received pilot signal by using a least square channel estimation algorithm to obtain an estimation value H; an N'-dimensional channel autocorrelation matrix formula (I) and a channel frequency domain autocorrelation matrix Rfrom a transmitting antenna i to any receiving antenna are acquired, and a weight matrix W which is descrambled and denoised is calculated, wherein i=1, 2, . . . , N, and Nis the number of antennae at a transmitting end; the estimation value His corrected by using the weight matrix W to obtain a corrected estimation value H. The method and device of the disclosure may obtain the performance as close as possible to the LMMSE technology through less prior statistic information, and have a simple implementation manner.

Method and device for estimating channel in multiple-receiving antenna system

Provided is a processing method and apparatus for performing space-time decoding on MIMO signals. The method includes: performing QR decomposition on a channel matrix H with a size of N&#xd7;Nin a MIMO system and performing an initialization operation, wherein Nis the number of transmitting antennas and Nis the number of receiving antennas; enumerating candidate constellation points of transmitting signals at each level of transmitting antennas according to an input parameter M=[M, M, . . . , M], a receiving signal y and a result of QR decomposition of H, wherein M is the number of the numerated candidate constellation points at each level, y=Hs+n; calculating increments of a Euclid distance due to addition of selection of a candidate constellation point at present level according to obtained candidate constellation points; and deciding and outputting space-time decoding according to the sum of calculated increments of Euclid distances of candidate constellation points at all levels.

Processing method and device for performing space-time decoding on MIMO signal

The present invention provides a pilot-based timing offset estimation apparatus and method. The timing offset estimation apparatus includes: a pilot bit channel estimation module, configured to acquire pilot bit frequency-domain channel estimation values of target users through calculation on respective sub-carriers of the target users according to received frequency-domain demodulation reference symbols and local frequency-domain demodulation reference symbols; and a timing offset estimation module, configured to respectively perform timing offset estimation for each target user by using phase differences among the pilot bit frequency-domain channel estimation values on the respective sub-carriers. The present invention performs timing offset estimation for multiple users on the basis of the received pilot sequences, therefore provides more accurate measurement values for timing offset compensation and timing offset reporting, so as to reduce the influence of the timing offset on the receiver performance.

Pilot-based time offset estimation apparatus and method

A frequency offset estimation and correction method in an orthogonal frequency division multiplexing (OFDM) system is disclosed in present invention, including: obtaining a pilot frequency domain channel estimation value of a target user, and smoothing the channel estimation value in frequency domain; obtaining the link quality state of a receiver; adopting a history smoothing algorithm or a multi-branch attempt algorithm to perform frequency offset estimation and frequency offset compensation, performing frequency domain demodulation for the data for which frequency offset compensation has been performed, and outputting a link quality state parameter; and updating the link quality state of the receiver according to the link quality state parameter, determining the output value of this frequency offset estimation and outputting a history frequency offset value required by next frequency offset estimation according to the determined output value of this frequency offset estimation. A corresponding apparatus is also disclosed in the present invention.

Method and apparatus for frequency offset estimation and correction in orthogonal frequency division multiplexing system

A baseband processing method based on double sampling, including: subjecting a received signal to root raised cosine-filtering process; sampling said signal; conducting channel estimation for every user based on the sampled data; and conducting multi-user joint detection and demodulation for said data. Wherein, the step of sampling said signal includes the following steps: conducting double sampling for said signal, and the interval of the sampling being &#xbd; chip; each chip selecting the average value of two sampling values as the sampling value of the chip; assembling the sampling value of every chip into a data stream. According to the present invention, in the case that the complexity of computation is not increased and only the memory space is doubled, the gain of the received signal in the system is improved effectively, especially when the synchronization of signals is bad, relatively large gain of the signals can be obtained, the system delay is reduced, and the real-time property of signal processing is improved. The method according to the present invention is suitable to the mobile communication system in a bad communication environment.

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Shenzhen, China

Hongfeng Qin