Spreadtrum Communications (shanghai) Co., Ltd.

Xiaojian Dong

Xuqiang Shen

Qiang Cao

Yongfang Zhou

Fajun Yan

Yu Dong

Baikui Xu

Dian Xu

An initial cell searching method includes: receiving at least one frame data sequence including synchronization channel signals; performing a correlation process between all synchronization sequences stored in user equipment and the received at least one data sequence to obtain correlation sequences, and calculating correlation power sequences corresponding to each of the correlation sequences; searching a highest peak and a secondary peak for each of the correlation power sequences, and recording the highest peak and corresponding position and the secondary peak and corresponding position; and determining a target cell ID based on a first target sequence. which corresponds to a synchronization sequence corresponding to a correlation power sequence of which a relative distance between the corresponding position of the highest peak and the corresponding position of the secondary peak meets a condition, and the highest peak of the correlation power sequence has a maximum peak value among highest peaks of all the correlation power sequences.

User equipment, initial cell searching method and apparatus thereof

The method includes receiving communication signals in a time domain and to aa frequency domain, providing resource blocks in the frequency domain including a first and second resource block, selecting first pilot signals from first resource block and second pilot signals from second resource block, calculating a first average value based on the first pilot signals, calculating a second average value, determining a phase difference between the first and second pilot signals using the first and second average values, adjusting a first phase of first resource block using the phase difference, providing a first waveform using the first resource block with adjusted the first phase and the second resource block, applying a smoothing filter against the first waveform to generate a second waveform, generating a third waveform using at least the first and third set of phase and amplitude differences, and converting third waveform from frequency domain to time domain.

Method of channel estimation by phase rotation in an orthogonal frequency division multiplexing (OFDM) system

A mobile communication method based on a mobile communication terminal is provided, wherein a communication unit of the mobile communication terminal is adapted to working in at least two communication modes, and an antenna assembly of the mobile communication terminal is adapted to selectively working in different communication modes or in a combination of different communication modes. The method includes: selecting, based on a communication mode and a service type of the mobile communication terminal, a coupling relationship between the antenna assembly and the communication unit, so that the mobile communication terminal can work in various working modes; and if the communication mode and/or the service type of the mobile communication terminal changes, adjusting the coupling relationship between the antenna assembly and the communication unit based on the change. The mobile communication terminal using the method has characteristics of small size, low cost and less difficulty to design.

Mobile communication method

A method of processing communication signals, is described. The method includes receiving a communication signal in a time domain, converting the communication signal to a frequency domain, providing resource blocks, the resource blocks including a first resource block and a second resource block, the first resource block having a first boundary and a second boundary, the first boundary being adjacent to the second resource block, the second boundary being non-adjacent to other resource blocks, the first resource block including pilot signals, generating a third resource block based on the one or more pilot signals, providing a first waveform based on the resource blocks and the third resource block, applying a smoothing filter against the first waveform to generate a second waveform, and converting the second waveform from the frequency domain to the time domain.

Orthogonal frequency division multiplexing (OFDM) channel estimation to improve the smoothing process

Methods and communication terminals for determining rank indication in a multicarrier communication system, wherein communication in the multicarrier communication system is carried out over a plurality of subcarriers, wherein the communication terminal communicates with an interface station within a cell in a multiple-input-multiple-output (MIMO) configuration. In particular, multicarrier symbols are received including pilot signals from the interface station, wherein the pilot signals contain pilot data, and channel properties are estimated based on the received multicarrier symbols, wherein the channel properties include channel properties of at least one subcarrier carrying one of the pilot signals. The pilot data are equalized based on the channel properties for determination of at least one pilot power and at least one interference power based on the equalized pilot data, and a rank indication is determined based on the at least one pilot power and the at least one interference power.

Communications terminal, apparatus, and method for detecting rank indication

An OFDM communication system, a method and a device for transceiving signal are provided. The method includes: dividing M transmitting antennas into one or more groups to form U transmitting ports, wherein transmitting antennas in different groups are uncorrelated, and M is greater than or equal to U; forming P data flows using a Multiple-Input Multiple-Output (MIMO) mode, wherein P=U/2, and P is less than or equal to a number of receiving ports; and mapping a group of 2P modulation symbols, including two modulation symbols of each data flow, to a resource element pair to form Space Frequency Block Code (SFBC) coding relationships with each other, and transmitting the group of 2P modulation symbols on the U transmitting ports. The data transmission performance can be improved.

OFDM communication system, method and device for transceiving signal

A method and device for detecting DCI are provided. The method includes: obtaining intermediate data in DCI blind detection, the intermediate data including descrambled data, decoded data and detected RNTI values; determining data to be processed from the decoded data based on a matching result of the detected RNTI values and configured RNTI values; performing encoding, rate matching and modulation on the data to be processed to obtain modulated data; calculating confidence levels of the configured RNTI values based on the modulated data and the descrambled data; and when a maximum confidence level of the configured RNTI value is greater than a predetermined threshold of confidence level, determining that the data to be processed contains detected DCI. The probability of DCI misdetection may be reduced, and further the accuracy of uplink and downlink data on a mobile terminal and system stability may be ensured.

Method and device for detecting downlink control information

Methods and communication terminals for estimating noise in a multicarrier communication system, where multicarrier symbols are received that include pilot signals, channel properties are estimated based on the received multicarrier symbols, wherein the channel properties include channel properties of a subcarrier carrying one of the pilot signals, and the channel properties of the subcarrier carrying one of the pilot signals are mixed with the corresponding pilot signal to calculate a noise power for the corresponding subcarrier.

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Shanghai, China

Xiaojian Dong