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MIMO-OFDM system frequency deviation estimation method

A technology of MIMO-OFDM and system frequency, which is applied in the field of frequency deviation estimation when receiving similar 802.11n frame structure signals, and can solve problems such as the influence of MIMO-OFDM system decoding performance

Inactive Publication Date: 2016-01-13
中科威发半导体(苏州)有限公司
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Problems solved by technology

Usually, the IEEE802.11n system uses the short training sequence and long training sequence data of the preamble field to estimate the frequency offset. The residual frequency offset of this frequency offset estimation based on the time domain is already very small, but most of the residual frequency offset is still larger than the carrier spacing. 1% of the MIMO-OFDM system still has a certain impact on the decoding performance, and a new method is needed to further improve the accuracy of frequency offset estimation

Method used

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  • MIMO-OFDM system frequency deviation estimation method
  • MIMO-OFDM system frequency deviation estimation method

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Embodiment 1

[0033] Embodiment 1: The three PPDU signal frame formats of 802.11n are as attached figure 1 As shown, all of them include short training sequence STF, long training sequence LTF and SIG sequence. In the 802.11n HT_Mixed format signal frame, the SIG sequence after the short training sequence STF and the long training sequence LTF includes three SIG fields: L_SIG, HT_SIG1 and HT_SIG2. The method for estimating the frequency offset of the MIMO-OFDM system will be described in detail below by taking receiving the HT_Mixed format signal as an example.

[0034] Step 1: Calculate the coarse frequency deviation Δf using the short training sequence STF of the received signal sts .

[0035] The short training sequence STF includes several consecutive repetition fields STS, and the signal received by each receiving antenna is calculated by using the continuous repetition field STS

[0036] R _ s t s _ r ...

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Abstract

The invention relates to an MIMO-OFDM system frequency deviation estimation method. The method is used for performing frequency deviation estimation on signals which contain a short training sequence, a long training sequence and an SIG sequence and are received by a plurality of receiving antennas of the receiver of an MIMO-OFDM system. The method of the invention includes the following steps that: coarse frequency deviation is calculated through utilizing the short training sequence of the signals; long training sequence frequency deviation is calculated through utilizing the long training sequence of the signals; time-domain residual carrier frequency deviation is calculated through utilizing the SIG sequence; and the coarse frequency deviation, the long training sequence frequency deviation and the time-domain residual carrier frequency deviation are summated, and a summation result is adopted as the estimation result of carrier frequency deviation. The method has the advantages of high frequency deviation estimation accuracy and wide application range.

Description

technical field [0001] The invention relates to a method for a MIMO-OFDM system receiver to use a training sequence and a SIG sequence to estimate carrier frequency deviation, and is especially suitable for a method for estimating frequency deviation when receiving similar 802.11n frame structure signals. Background technique [0002] In an OFDM system, the carrier frequency deviation will cause the frequency domain sampling value of the received signal to shift. Moreover, if the carrier frequency deviation is not an integer multiple of the subcarrier spacing, there will be energy "leakage" between the subcarriers, resulting in the destruction of the orthogonality between the subcarriers and the introduction of inter-subcarrier interference (ICI). ICI directly affects the results of channel estimation and receiving demodulation, and the receiving packet error rate of the overall system increases. Compared with single-antenna systems, the interference between spatial data st...

Claims

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Application Information

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IPC IPC(8): H04L27/26
CPCH04L27/2659H04L27/266H04L27/2672H04L27/2682
Inventor 周立国颜峻崔秀伶彭锦
Owner 中科威发半导体(苏州)有限公司
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