Systems and methods related to a synchronization signal (18) particularly well suited for wireless devices (22) in an extended coverage area (16) of a cell (14) of a cellular communications network (10) are disclosed. In one embodiment, a base station (12) transmits a synchronization signal (18) including multiple repetitions of a basic synchronization block during a coherence time of a downlink channel over which the synchronization signal (18) is transmitted. The multiple repetitions of the basic synchronization block during the coherence time enable coherent combining during detection of the synchronization signal (18) at wireless devices (22) located in the cellular communications network (10). This coherent combining enables, for example, wireless devices (22) located in an extended coverage area (16) of a cell (14) served by the base station (12) to synchronize to the cell (14) using a shorter synchronization signal (18) than that which would be required if only non-coherent combining were used.

Synchronization signal design for wireless devices in a long range extension mode

Aspects of the present disclosure provide techniques for design of synchronization signals for narrowband operation, which can be used for stand-alone/inband/ guard-band deployment. An example method is provided for operations which may be performed by a base station (BS). The example method generally includes generating a primary synchronization signal (PSS) utilizing a first code sequence and a cover code applied to the first code sequence over a first number of symbols within one or more subframes, generating a secondary synchronization signal (SSS) based on a second code sequence over a second number of symbols within one or more subframes, and transmitting the PSS and the SSS in the first and second subframes to a first type of a user equipment (UE) that communicates on one or more narrowband regions of wider system bandwidth.

Design of synchronization signals for narrowband operation

Method and device for searching neighbor-cell of LTE (long term evolution) system

The invention discloses an LTE (long term evolution) system downward auxiliary synchronous signal detection method with low implementation complexity. The method includes: filtering time-domain auxiliary synchronous receiving signals through an anti-alias filter, and then downsampling to acquire time-domain auxiliary synchronous receiving signals subjected to downsampling; subjecting to the time-domain auxiliary synchronous receiving signals subjected to downsampling to FFT (fast Fourier transform) conversion to acquire frequency-domain auxiliary synchronous receiving signals; performing difference related calculation on sequences in a transcript sequence group of the frequency-domain auxiliary synchronous receiving signals and frequency-domain scrambled auxiliary synchronous signals to acquire correlation values; selecting an index maximizing the correlation values to estimate ID (identity) information of a cell group and timing information of a system frame. Compared with the prior art, the LTE system downward auxiliary synchronous signal detection method has the advantages that the method can be implemented with lower implementation complexity, calculation complexity is not added, and differential detection performance of the LTE system downward auxiliary synchronous signals is obviously improved.

LTE (long term evolution) system downward auxiliary synchronous signal detection method with low implementation complexity

The invention discloses a method for fast estimating time-frequency parameters in a TD-LTE system, and belongs to the technical field of mobile communication. According to the method, an SSS symmetric multiplication algorithm is firstly adopted to carry out timing synchronization, and the position of an SSS is confirmed in a time domain; secondly, the position of a PSS is confirmed according to the position of the SSS, and the PSS signal of a complete symbol is extracted; a correlation operation is carried out on the extracted PSS signal and a local PSS signal, an operation result is divided into a front part and a second part, a correlation operation is carried out on the two parts, and decimal frequency doubling deviation is accordingly estimated; finally, the range space where integral frequency deviation exists is confirmed according to the estimated decimal frequency doubling deviation, and the integral frequency deviation is estimated in the time domain through a twiddle factor correction method in the space. The method can precisely and fast carry out time-frequency parameter estimation, can effectively resist influences caused by large carrier frequency deviation on estimation of a timing synchronization position and resist influences brought by timing errors on integral frequency deviation estimation, and can estimate the integral frequency deviation in the time domain.

Method for fast estimating time-frequency parameters in TD-LTE system

Self-adaptive auxiliary synchronization signal detection method for TD-LTE (time division-long term evolution) system

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Self-adaptive auxiliary synchronization signal detection method for TD-LTE (time division-long term evolution) system