Receiver of OFDM system and moving speed estimation method thereof

A technology of moving speed and receiver, applied in the directions of multi-frequency code systems, baseband system components, etc., can solve problems such as performance degradation, and achieve the effect of simple method, easy implementation, and improved estimation accuracy

Inactive Publication Date: 2010-08-18
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the channel becomes a Rice channel or the moving speed exceeds 200km / h, the performance of the existing moving speed estimation methods will drop significantly

Method used

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  • Receiver of OFDM system and moving speed estimation method thereof
  • Receiver of OFDM system and moving speed estimation method thereof
  • Receiver of OFDM system and moving speed estimation method thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0051] Example 1: In this example, F is obtained by looking up the table method 2 (·) instance.

[0052] Select the frequency domain channel response H of continuous M OFDM symbols from the channel frequency domain response output by the frequency domain channel response variation estimation module 1 , H 2 ,...,H M , using the function F 1 One form of ( ) is:

[0053] F 1 ( H 1 , H 2 , . . . , H M ) = 1 M - 1 Σ k = 1 M - 1 | H k ...

example 2

[0060] Example 2: In this example, F is obtained by the formula method 2 (·) instance.

[0061] During the coherence time, arbitrarily select the frequency domain channel response of M OFDM symbols from the channel frequency domain response output by the frequency domain channel response variation estimation module m∈N, for the convenience of writing, the m∈N, M is an odd number at this time. function F 1 The expression of (·) is:

[0062] F 1 ( H 1 , H 3 , . . . H 2 * m + 1 , . . . H M ) = 1 M - 1 ...

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Abstract

The invention relates to a receiver of an OFDM system and a moving speed estimation method thereof, belonging to the field of wireless communication. The method comprises the following steps: 1) leading the receiver to convert a time domain OFDM signal r(n) to a frequency domain OFDM signal R(n); 2) leading the receiver to carry out channel estimation on the frequency domain OFDM signal R(n) and obtaining frequency domain channel response Hi of each OFDM symbol; 3) leading the receiver to calculate the change value delta H of the frequency domain channel response between the different OFDM symbols according to the obtained frequency domain channel response; and 4) leading the receiver to estimate the current moving speed of the receiver according to the change value delta H; and the system comprises a fast Fourier transform module, a channel estimation module, a frequency domain channel response change estimation module and a moving speed estimation module of the receiver. The moving speed estimation method of the receiver is simple, rapid and easy to implement and is not only applicable to Rayleigh channels, but also applicable to Rician channels; furthermore, the estimation precision is high.

Description

Technical field: [0001] The present invention relates to OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology in the field of wireless communication, in particular to an OFDM system receiver and a method for estimating its moving speed. Background technique: [0002] OFDM is a very promising multi-carrier modulation technology in the field of wireless communication. At present, this technology has been widely used in IEEE 802.11a, HIPERLAN / 2WLAN (Wireless Local Area Network, wireless local area network) and 3GPP LTE (third generation wireless Communication system long-term evolution) and other broadband wireless communication systems. [0003] In an OFDM system, the movement of the receiver will cause Doppler dispersion, which will destroy the orthogonality between subcarriers of the received signal and bring difficulties to signal demodulation. Especially when there is multi-path transmission in the wireless channel, the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/02
Inventor 周舒张小欣赵玉萍赵婷婷
Owner PEKING UNIV
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