Modified type LS channel estimation method for OFDM system

A channel estimation and improved technology, applied in the field of communication, can solve the problems of poor bit error performance, low complexity, and high computational complexity, and achieve the effects of simple channel estimation method, low computational complexity, and low time consumption.

Inactive Publication Date: 2008-01-30
XIDIAN UNIV
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Problems solved by technology

[0006] The purpose of the present invention is to overcome the defects of high computational complexity and poor bit error performance in the above-mentioned prior art under low SNR, and provide an improved LS channel estimation method for OFDM system, which can be used in low SNR The impulse response of the channel can be estimated more accurately, and the complexity is not high

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  • Modified type LS channel estimation method for OFDM system
  • Modified type LS channel estimation method for OFDM system
  • Modified type LS channel estimation method for OFDM system

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Embodiment Construction

[0025] With reference to Fig. 1, it is the flowchart that the present invention realizes, can find out clearly that the concrete implementation step of this method is as follows from the flowchart:

[0026] 1. At the transmitting end, add a frame synchronization header and two consecutive OFDM training symbols and the cyclic prefix of the OFDM training symbols known to both the receiving and transmitting ends before the OFDM symbol to be sent to form a complete burst packet frame, and transmit machine sent out.

[0027] When the transmitter needs to transmit data, it first performs serial-to-parallel conversion on the binary information to be transmitted; modulates the parallel binary information after the serial-to-parallel conversion, and the modulation can use QPSK or QAM modulation; N data are divided into one group, and N-point IFFT is performed on each group of data to obtain an OFDM data symbol, and then a cyclic prefix of the OFDM data symbol is added in front of the O...

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Abstract

The invention discloses an improved LS channel estimating method used in OFDM system, and relates to the communication technical field with the purpose of overcoming the deficiencies of high computation complexity and poor error performance of the prior art in low SNR situation. By adopting the method, the shock responses of channels can be more accurately estimated in low SNR situations, and the computational complexity is not high. The realization process of the method uses the LS algorithm to estimate the frequency domain responses of the channels, which then are converted to time domain; the limitation of channel pulse responses in the time domain is used for getting rid of part of noise interference; and new channel pulse responses are acquired, which are converted again to the frequency domain to replace the channel frequency domain responses estimated with LS algorithm, to channel-equalizing received data, and coherent-demodulate the equalized data. The invention is applicable to OFDM modulating burst-mode wireless communication systems.

Description

technical field [0001] The invention belongs to the technical field of communication and relates to communication signal processing technology, in particular to an improved LS channel estimation method for OFDM system, which can be used for OFDM modulation burst wireless communication system. Background technique [0002] Orthogonal frequency division multiplexing OFDM is a multi-carrier modulation technology, which converts high-speed data streams into low-rate parallel sub-data streams through serial-to-parallel conversion, and then modulates them onto mutually orthogonal sub-carriers, and finally parallelizes them. transmission. OFDM divides channelization into multiple sub-channels, each sub-channel is kept orthogonal, and the spectrum overlaps with each other, thereby reducing inter-symbol interference, improving spectrum utilization, and strong resistance to narrow-band interference, so it is suitable for wireless multipath frequency selectivity Channel, OFDM modulati...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 李维英李建东李红艳杨胜陈东庞继勇
Owner XIDIAN UNIV
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