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Downlink frequency deviation estimation method based on IEEE (Institute of Electrical and Electronics Engineers) 802.16e communication standard

A frequency offset estimation and downlink technology, which is applied in the communication between multiple stations, multi-frequency code systems, baseband system components, etc. , to achieve the effect of low complexity and prevent performance degradation

Inactive Publication Date: 2012-07-04
XI AN JIAOTONG UNIV
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Problems solved by technology

[0026] Since the time-domain signal of the frame header sent by the sending end is not strictly periodic, and after passing through the channel, the signal received at the receiving end does not have strict periodic repetition characteristics, so the conventional frequency offset estimation algorithm is applied in the IEEE 802.16e standard will cause large errors and seriously affect the performance of the system

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  • Downlink frequency deviation estimation method based on IEEE (Institute of Electrical and Electronics Engineers) 802.16e communication standard
  • Downlink frequency deviation estimation method based on IEEE (Institute of Electrical and Electronics Engineers) 802.16e communication standard
  • Downlink frequency deviation estimation method based on IEEE (Institute of Electrical and Electronics Engineers) 802.16e communication standard

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Embodiment Construction

[0049] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation examples.

[0050] image 3 It is a flow chart of the frequency offset estimation method of the present invention.

[0051] The IEEE 802.16e standard supports 2048-point, 1024-point, 512-point and 128-point FFT, and the present invention will be described in detail below by taking 512-point FFT as an example.

[0052] (a) The frequency domain sequence of the frame header preamble transmitted by the base station is X(n). After FFT transformation, the frame header time domain sequence s(n) can be obtained. s(n) has the characteristics of three pseudo-periodic repetitions. The pseudo-period T=[N / 3] of the head, in the present embodiment, when N=512, by rounding T=171, the first segment sequence and the second segment sequence are pressed Carry out a correlation operation, and use the phase of this correlation value as the transmission...

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Abstract

The invention discloses a downlink frequency deviation estimation method based on an IEEE 802.16e communication standard, wherein a frequency deviation value can be more accurately obtained by comparing the phase position of a receiving-end pseudo-repetitive sequence correlation value with the phase position of a transmitting-end pseudo-repetitive sequence correlation value; meanwhile, the invention is insensitive to timing synchronism deviation and prevents the performance decrease of a frequency deviation estimation algorithm caused by imprecise timing synchronism. In the invention, the influence of a channel response (multidiameter delay) on the frequency deviation estimation algorithm is eliminated by adopting an iterative algorithm, and under a general condition, a stable and accurate frequency deviation estimation value can be obtained by only adopting iteration for one time, and the complexity is not high.

Description

technical field [0001] The invention relates to a downlink frequency offset estimation method based on the IEEE 802.16e communication standard. Background technique [0002] Today, with the rapid development of mobile communications, WiMAX (Worldwide Interoperability for Microwave Access) technology, as a broadband wireless access technology for metropolitan area networks, is attracting more and more attention from the industry. [0003] WiMAX technology is based on IEEE's 802.16 series standards. According to different frequency bands, there are different physical layer technologies corresponding to it, namely SC (Signal Carrier, single carrier), OFDM (Orthogonal Frequency Division Multiplex, Orthogonal Frequency Division Multiplexing) And OFDMA (Orthogonal Frequency Division Multiple Access, Orthogonal Frequency Division Multiple Access). Because OFDM and OFDMA have high spectral efficiency, and have good ability to resist multipath effect, frequency selective fading and ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/02H04B7/26
Inventor 穆鹏程殷勤业王文杰薛立昌任畅锐
Owner XI AN JIAOTONG UNIV
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