A frequency domain channel estimation method for OFDM multiplex system

An orthogonal frequency division and frequency domain channel technology, which is applied in the field of frequency domain channel estimation and can solve the problems of sensitivity, pilot subcarrier position sensitivity, and large computational load.

Inactive Publication Date: 2008-09-17
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0009] Among them, the implementation complexity of method (1) is small, but the noise is not suppressed, and the performance is relatively poor
Method (2) can effectively suppress the influence of noise and interference through time-domain filtering. The algorithm has low complexity and is suitable for hardware implementation. However, the algorithm is very sensitive to the position of the pilot subcarrier, and the change of the position of the pilot subcarrier will cause Rapid deterioration of channel estimation performance
Method (3) is to solve the problem that method (2) i

Method used

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  • A frequency domain channel estimation method for OFDM multiplex system
  • A frequency domain channel estimation method for OFDM multiplex system
  • A frequency domain channel estimation method for OFDM multiplex system

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Embodiment Construction

[0028] The specific implementation examples of the present invention are given below. It should be noted that the parameters in the examples do not affect the generality of this patent.

[0029] 1. Transmitter and receiver

[0030] The binary information bits are digitally modulated according to figure 1 Subcarrier allocation is performed, IDFT is performed, cyclic prefix (CP) is added, and transmission is performed from the transmitter.

[0031] The receiving antenna receives the signal, completes the removal of the cyclic prefix, DFT transformation, separates the data of the pilot subcarrier and the data subcarrier, and recovers the information bits sent by the transmitter after demodulation through channel estimation and equalization.

[0032] Two, examples

[0033] Assuming an OFDM system, the total number of subcarriers is N=1024, the serial number of subcarriers is 0~1023, and the length of the cyclic prefix is ​​selected as L cp =216, the signal modulation method is Q...

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Abstract

The invention provides a frequency domain channel estimation method for an orthogonal frequency division multiplexing system, characterized in that a pilot frequency sub-carrier phase is compensated at a receiving terminal. According to the invention, the effect of pilot frequency sub-carrier position offset to channel estimation accuracy is eliminated, which exists DFT interpolating estimating algorithm with noise suppression function and frequency domain channel estimating algorithm for the OFDM system, and the implementing complexity is low, making the method suitable for hardware implementation.

Description

technical field [0001] The invention belongs to the field of mobile communication, and mainly relates to frequency-domain channel estimation technology of an Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) system. Background technique [0002] Orthogonal Frequency Division Multiplexing is a special multi-carrier transmission scheme. It divides a wideband channel into a plurality of mutually orthogonal narrowband flat fading sub-channels to transmit data simultaneously, which is beneficial to overcome the frequency selective fading of wireless channels. In practical applications, OFDM system demodulation can be divided into coherent demodulation and differential demodulation. When using differential demodulation, the receiver does not need to perform channel estimation, which can simplify the complexity of the receiver, but compared with coherent demodulation, the performance of differential demodulation is 3dB worse. For cohere...

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Application Information

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IPC IPC(8): H04L27/26H04J11/00H04L1/00
Inventor 雷霞王晨唐万斌李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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