A cell search method in a communication system
A cell search and communication system technology, applied in the field of communication, can solve the problem of position deviation of the strongest correlation peak, reducing the accuracy of cell group ID, symbol interference, etc.
Inactive Publication Date: 2017-06-30
POTEVIO INFORMATION TECH CO LTD
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Problems solved by technology
[0005] During the cell search process, whether in the channel estimation process of the first synchronization signal or in the calculation of the second synchronization sequence, the timing error of the Orthogonal Frequency Division Multiplexing (OFDM) symbol will cause inter-symbol interference, and then Causes a deviation in the position of the strongest correlation peak, reducing the accuracy of cell group ID detection
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[0019] In order to make the object, technical solution and advantages of the present invention more clearly, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0020] In the embodiment of the present invention, firstly, the intersymbol interference between OFDM symbols of the first synchronization signal is eliminated, and the intersymbol interference between the second synchronization signals is eliminated. In the process of determining the ID of the cell group, due to the elimination of intersymbol interference and the reduction of errors during channel estimation and calculation of the second updated synchronization signal sequence, the position of the strongest correlation peak can be more accurately located, and the cell group can be determined more accurately ID.
[0021] See attached figure 1 It is a schematic flow diagram of a method for cell search in a communication system, specif...
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A method for cell search in a communication system, the method comprising: eliminating intersymbol interference between orthogonal frequency division multiplexing (OFDM) symbols in a first synchronization signal to obtain a first update synchronization signal, and eliminating OFDM in a second synchronization signal The intersymbol interference between symbols is used to obtain the second updated synchronization signal; the starting position of the first updated synchronization signal is detected by symbol timing, and the channel estimation is performed jointly with the local first synchronization signal to obtain the channel estimation value of the first updated synchronization signal; according to the first updated synchronization signal Calculating the starting position of the second updated synchronization signal from an updated synchronization signal, and obtaining a second updated synchronization signal sequence in combination with the channel estimation value of the first updated synchronization signal; using an ergodic algorithm to calculate the synchronization signal correlation value cyclically based on the second updated synchronization signal sequence, And determine the cell group ID according to the position of the strongest correlation peak. After applying the embodiment of the present invention, the interference between OFDM symbols can be eliminated, and then the cell group ID can be accurately determined.
Description
technical field [0001] The present application relates to the field of communication technologies, and more specifically, relates to a method for cell search in a communication system. Background technique [0002] The authorized frequency points of the power communication network are discretely distributed in the frequency band of 223.525MHz to 231.65MHz, a total of 40, each with a bandwidth of 25KHz, called physical sub-bands. Three of them are used as synchronization subbands, and a synchronization signal is sent every other radio frame for cell search, and the remaining 37 frequency points are used as service subbands. Every 40 wireless frames is a period, and one frame is used as a synchronization frame. Synchronization signals are sent on all service subbands to maintain downlink synchronization, and the remaining 39 wireless frames are used for services. [0003] In the current power communication system, the synchronization channel is composed of a first synchroniza...
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IPC IPC(8): H04J11/00H04L27/26H04B1/7083H04L25/03
Inventor 龚秋莎王单
Owner POTEVIO INFORMATION TECH CO LTD