Method and device for coarse synchronizing sub-frame
A coarse synchronization and seeding technology, applied in the direction of DC level restoration device/bias distortion correction, communication between multiple stations, digital transmission system, etc. Improve stability and avoid the effect of AGC attempts
Active Publication Date: 2014-03-12
SANECHIPS TECH CO LTD
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[0014] The technical problem to be solved by the present invention is to provide a cell search coarse synchronization method and device, solve the problems of using AGC abnormal value, increase the probability of misjudgment, increase the correlation between modules, etc., and realize a method of subframe coarse synchronization that avoids AGC attempts and device
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[0049] The existing characteristic window method is based on the principle that the power of the synchronization code is higher than the power of the surrounding Gp segment, and the input of the soft decision must be used. The baseband signal itself of the radio frequency output is an analog signal, and the A / D (analog / digital) conversion converts it It is a multi-bit quantized digital signal. The quantization here is soft decision, which means that in addition to the sign, there is also data amplitude information. For example, 107.152 is quantized and becomes 107, and -13.87 is quantized and becomes -14.
[0050]In order to obtain a reasonably quantified downlink synchronization code signal and its nearby GP on the digital baseband, the design method of AGC trial has to be introduced, but the introduction of AGC trial has led to a series of outliers, increased probability of misjudgment, and increased correlation between modules. New problems make the system quite sensitive to...
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The present invention discloses a method and device for coarse synchronization of a sub-frame, and includes: a terminal samples digital baseband signals, and performs the hard decision to the sampled signals to get the sign bits of the sampled signals; the terminal intercepts a virtual sub-frame from the sign bits of the sampled signals, performs the differential operation to the adjacent sampled signals points of each intercepted virtual sub-frame, and gets the differential hard decision virtual sub-frame data; the terminal accumulates several differential hard decision virtual sub-frame data, and removes the sign bits of each sampled signals point of the accumulation result; the terminal searches the position which has the characteristics of the downlink synchronization code from the accumulation result. The present invention is based on the hard decision data accumulation design, avoids the automatic gain control (AGC) attempt, introduces the differential operation to eliminate the effect of the phase and channel, and thus eliminates the dependence of the cell search coarse synchronization on many factors, for example a radio frequency device, the bit width of an analog to digital converter, and the dynamic range of the downlink signal, and improves the stability of the cell search coarse synchronization process obviously.
Description
technical field [0001] The present invention relates to a time division synchronous code division multiple access (Time Division-Synchronized Code Division Multiple Access, TD-SCDMA) system, in particular to a method and device for coarse subframe synchronization. Background technique [0002] TD-SCDMA is one of the three mainstream standards of 3G (third generation mobile communication technology), and has broad application prospects. [0003] In the TD-SCDMA system, the terminal (UE) needs to search for possible existing cells after initial power-on, and select a suitable cell to log in. Only after the UE logs in to the cell, can it obtain more detailed information about the cell and obtain neighboring cells Only after logging in to the cell, can you monitor paging or initiate a call. Usually, the process from power-on search to logging in to a suitable cell is defined as the initial cell search process, or ICS for short. [0004] The initial search process of TD-SCDMA ce...
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IPC IPC(8): H04B7/26H04L25/02H04L25/06
CPCH04L27/2656H04L27/2676
Inventor 邱宁李强曾文琪于天昆刘中伟邢艳楠梁立宏李立文林峰褚金涛
Owner SANECHIPS TECH CO LTD