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OFDM symbol and frequency synchronization and channel style estimating method

A channel type and frequency synchronization technology, applied in the direction of multi-frequency code system, baseband system components, etc., can solve the problems of long synchronization time, large amount of calculation, and large amount of calculation of integer frequency offset estimation, so as to achieve guaranteed effect and improve synchronization Efficiency and the effect of reducing the number of cross-correlation operations

Inactive Publication Date: 2007-08-15
新奇点智能科技集团有限公司
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Problems solved by technology

[0016] The disadvantages of the above methods for realizing OFDM symbol and frequency synchronization and channel type estimation are that the amount of calculation is large and the synchronization time is long; especially when there is a huge frequency deviation between the transmitter and the receiver, the calculation amount of the integer frequency offset estimation is very large, so that sync time is long

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  • OFDM symbol and frequency synchronization and channel style estimating method
  • OFDM symbol and frequency synchronization and channel style estimating method
  • OFDM symbol and frequency synchronization and channel style estimating method

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Embodiment Construction

[0048]The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. In the instructions below, is the smallest integer greater than x, and x is the largest integer smaller than x.

[0049] OFDM symbol and frequency synchronization and channel estimation method, as shown in Figure 2, comprise the following steps:

[0050] Step 1, rough OFDM symbol position and fractional frequency offset estimation. Assuming that the length of the time-domain training sequence is L sampling points, and the interval of the time-domain training sequence is D sampling points, the received signal r(t) is first down-sampled by N times to obtain the down-sampled received signal r d (t)=r(Nt), where N is an integer, and L + D N is an integer; at this time The correlation length of Then use the window length equal to L N The sliding wi...

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Abstract

The disclosed method for synchronizing OFDM signal frequency and estimating channel type comprises: obtaining the coarse position and decimal frequency-offset estimation for OFDM signal; correcting the frequency-offset; reordering local or received frequency-domain training sequence; searching the coarse integer frequency-offset; fine searching the integer frequency- offset to obtain the integer frequency-offset estimation, OFDM signal position estimation, and the effective channel position. This invention reduces search operation time, and can ensure synchronization effect.

Description

technical field [0001] The invention relates to symbol and frequency synchronization and channel type estimation methods, in particular to a method for realizing Orthogonal Frequency Division Multiplexing (OFDM) symbol and frequency synchronization and channel type estimation by using a special training sequence. Background technique [0002] OFDM technology is widely used in the fourth-generation communication system 4G (Fourth-Generation Cellular Mobile PhoneSystems) and digital broadcasting systems because of its advantages of high spectrum efficiency and low channel equalization processing complexity, such as digital TV terrestrial broadcasting systems, mobile Multimedia Broadcasting System (STIMI), etc. [0003] In an OFDM system, symbol synchronization errors and frequency asynchrony between the transmitter and receiver will introduce inter-symbol interference (ISI) and inter-subcarrier interference (ICI), resulting in reduced reception performance. Because the OFDM s...

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Application Information

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IPC IPC(8): H04L27/26H04L25/02
Inventor (要求不公开姓名)
Owner 新奇点智能科技集团有限公司
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