Huawei Technologies Co., Limited

Yunbao Zeng

Liangliang Zhang

Hui Zhao

Wei Zhu

Ting Li

Jingxin Wei

Long Zhao

Jianhua Qin

Chengquan Huang

Junshi Chen

The present invention discloses a preamble sequence generating method and device, which are used to avoid a problem, caused by damages to a preamble sequence resulting from interference in an NB-PLC system, that it is difficult for a receive end to correctly perform timing synchronization. The method includes: determining a quantity m of orthogonal frequency division multiplexing OFDM symbols that constitute a single pattern in a preamble sequence, where m is not less than 2; and generating a preamble sequence according to m, so that every m OFDM symbols that are in the generated preamble sequence and consecutive in a time domain constitute a single pattern, and the generated preamble sequence includes at least two patterns, where the patterns are different from each other. Embodiments of the present invention further provide a timing synchronization method and device.

Preamble sequence generating method, timing synchronization method, and device

A power adjusting method and apparatus provided by embodiments of the present invention relate to the field of communications. The power adjusting method of this embodiment includes: receiving a signal from a sending end, where the signal includes a cyclic prefix (CP) signal; detecting and acquiring first receiving power and second receiving power of the CP signal, where the first receiving power is average power of N sampling points of the CP signal, and the second receiving power is average power of M sampling points of the CP signal; after determining that a ratio of the first receiving power to target power is greater than a first preset threshold, adjusting signal power magnification; and after determining that the ratio of the second receiving power to the target power is greater than a second preset threshold, adjusting the signal power magnification again.

Power adjusting method and apparatus

The present invention relates to the field of communication technologies and discloses a method and an apparatus for auto gain control (AGC) in a radio receiver, which can ensure that a radio frequency device, an analog device, and various nodes in a digital domain are non-saturated and that useful signal power is adjusted to a certain power level. According to the present invention, total signal power on an air interface is subtracted from a preset first target power to obtain an analog auto gain control (AAGC) gain, and then a second target power is subtracted from an interference signal power in a digital baseband to obtain a digital auto gain control (DAGC) gain.

Method and apparatus for auto gain control in radio receiver

A method, system and device for MS handover are provided in an embodiment of the present invention. The method includes: receiving the handover-assisting information from the RS by the serving MR-BS; determining whether to recommend the RS to the MS as the target station according to the handover-assisting information by the serving MR-BS. The embodiments of the present invention enable the serving MR-BS to obtain related information from the RS and the serving MR-BS of the MS to better ascertain the potential target station and related information to be recommended to the MS. This helps improve the handover performance of the MS and reduce the failure rate.

Method, system and device for mobile station handover

A method and a device for correcting In-phase/Quadrature (IQ) imbalance in baseband signals of a wireless communication receiver are disclosed. The method includes the following: the receiver receives Radio Frequency (RF) signals, and processes the signals to generate In-phase (I) signals and Quadrature (Q) signals; the receiver calculates to obtain an autocorrelation value E(|I|) of the I signal, an autocorrelation value E(|Q|) of a current Q signal, and a cross-correlation value E(IQ) of the I signal and the current Q signal; the receiver computes E(|I|), (|Q|) and E(IQ) through arithmetical operations to obtain an estimate value &#xc2;of a current amplitude imbalance calibration factor and an estimate value {circumflex over (P)}of a current phase imbalance calibration factor; and the receiver corrects the current Q signal according to &#xc2;and {circumflex over (P)}. The embodiments reduce operations.

Method and device for correcting IQ imbalance of baseband signals in wireless communication receiver

A tail-biting decoding method and device are provided, so as to improve accuracy of backtracking state determination and decrease decoding delay. The method includes the following steps. Survivor paths of a training system are acquired. The training system is formed of a first transport block and a second transport block connected in series. The number of the survivor paths passing through each first state of the second transport block is counted. A first state having a maximum number of the survivor paths may be selected as a backtracking state of the second transport block. Backtracking decoding is performed on the second transport block by using the survivor paths on the backtracking state, so as to obtain a decoding result.

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Shenzhen, China

Yunbao Zeng