A carrier residual frequency deviation tracking method based on OFDM system

A residual frequency offset and carrier technology, applied in the field of carrier residual frequency offset tracking, can solve problems such as implementation complexity, and achieve the effect of reducing the amount of calculation, reducing the impact, and reducing the variance of tracking

Inactive Publication Date: 2007-11-28
TIMI TECH
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Problems solved by technology

[0004] In the usual residual frequency offset estimation algorithm, it is necessary to calculate the phase rotation value of the continuous pilot symbols in the OFDM symbol first, and then average or filter the specific

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  • A carrier residual frequency deviation tracking method based on OFDM system
  • A carrier residual frequency deviation tracking method based on OFDM system
  • A carrier residual frequency deviation tracking method based on OFDM system

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specific Embodiment 1

[0036] In an OFDM-based digital broadcasting system with a signal bandwidth of 8MHz, an OFDM symbol consists of a cyclic prefix (CP), a symbol body, and a front and back guard interval (GD). The OFDM symbol length is 409.6us, the cyclic prefix length is 51.2us, and the front and rear guard intervals are 4.4us. The system sampling rate is 10MHz.

[0037] OFDM symbols transmit three types of signals, namely continuous pilot, scattered pilot and data, a total of 3076 subcarriers (0-3075), the distribution of which is shown in Figure 2.

[0038] Among them, the use of continuous pilots is 0, 32, 86, 184, 324, 380, 424, 544, 564, 600, 650, 720, 832, 990, 1044, 1096, 1164, 1232, 1292, 1352, 1444, 1498 , 1510, 1537, 1538, 1564, 1576, 1630, 1722, 1782, 1842, 1910, 1978, 2030, 2084, 2242, 2354, 2424, 2474, 2510, 2530, 2650, 2694, 2750, 2912, 2988, 3042 , 3075 subcarriers, a total of 48.

[0039] The length of each time slot is 20ms, adopting the same structure (beacon+42 OFDM symbol...

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Abstract

The invention discloses a tracing method of residual frequency deviation based on OFDM system carrier to proceed dynamic compensation for the evaluated value of residual frequency deviation, which comprises the following steps: evaluating the residual frequency deviation; tracing the step-length to select; compensating the frequency deviation dynamically; avoiding to count the specific value of phase rotation of continual frequency symbol in the OFDM symbol; reducing the counting quantity greatly; finishing the weighted mean with low tracing variance; setting the transformation criterion between big and small step lengths flexibly; fitting for mobile broadcast of satellite, wireless broadcast of ground and so on widely.

Description

technical field [0001] The invention relates to a carrier frequency offset tracking method, in particular to a carrier residual frequency offset tracking method of an OFDM-based digital broadcasting system. Background technique [0002] In addition to wide coverage and large program capacity, digital broadcasting is characterized by broadcasting, one-to-multipoint, one-to-one, and the cost of broadcasting information has nothing to do with the number of users. Therefore, as an important part of the information communication industry, digital broadcasting plays an important role in the construction of national information infrastructure, the realization of universal service and the national information security strategy. [0003] In an OFDM system, the carrier frequency deviation between transceivers not only attenuates the effective signal, but also produces serious inter-carrier interference (ICI), resulting in a serious loss of system signal-to-noise ratio. In order to co...

Claims

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Application Information

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IPC IPC(8): H04L27/227H04L27/26H04H1/00H04H20/00
Inventor 刘斌彬葛启宏陶涛
Owner TIMI TECH
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