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Improved pilot-frequency-based SIM-OFDM channel estimation method

A technology for channel estimation and pilot location, which is applied in the field of SIM-OFDM channel estimation, and can solve problems such as difficulty in implementing channel estimation.

Inactive Publication Date: 2015-07-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] The present invention aims at the technical problem that the channel estimation of the existing SIM-OFDM communication method is difficult to implement, and proposes a method for inserting arbitrary energy pilot sequences on silent subcarriers to complete channel estimation

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Embodiment Construction

[0020] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments.

[0021] The present invention is based on the existing SIM-OFDM system, and is different from the existing SIM-OFDM system in that the transmitting end pilots the sequence on the silent subcarrier, and then the receiving end uses a special detection method to detect where the pilot is located. The position is detected to complete the channel estimation, and the SIM modulation, transmission and reception processing involved are the same as the existing SIM-OFDM system.

[0022] Take (n,k)=(2,1), the total number of subcarriers N=1024, cyclic prefix CP=64, modulation symbols using QPSK (4-QAM), using ZF equalization, LMMSE channel estimation as examples to introduce Specific embodiments of the present invention.

[0023] Sending end:

[0024] Step 1-1: Determine the parameters ...

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Abstract

The invention discloses an improved pilot-frequency-based SIM-OFDM channel estimation method and belongs to the technical field of communication anti-interference. The method of finishing channel estimation by inserting a low-energy pilot frequency sequence to a silent subcarrier is provided for solving the technical problem that channel estimation is implemented difficultly through an existing SIM-OFDM communication method. According to the method, a receiving end inserts a pilot frequency sequence with any energy to a silent subcarrier; the receiving end conducts unified processing on a plurality of received signals, the average channel frequency domain response is obtained based on the formula shown in the specification, the primary channel estimation values of the received signals are obtained based on the average channel frequency domain response, balancing is conducted on the received signals based on a current channel estimation value, pilot frequency position detecting is conducted, and then channel estimation is updated according to the pilot frequency position, pilot frequency data, frequency domain receiving signals at the pilot frequency position. The method is used for channel estimation in an SIM-OFDM system and data demodulation of the frequency domain receiving signals, the advantages of the SIM-OFDM system are remained, channel estimation can be conducted through the pilot frequency, and a basis is provided for a final detecting algorithm.

Description

Technical field [0001] The invention belongs to the technical field of communication anti-interference, and specifically relates to a pilot-based SIM-OFDM channel estimation method. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) technology is a high-speed transmission technology for wireless communication. Its basic principle is to decompose the high-speed data stream into many low-rate sub-data streams, that is, divide the signal into many orthogonal sub-carriers, and use these mutual Orthogonal sub-carriers are simultaneously transmitted. This technology uses sub-carriers to modulate the data, expands the pulse width of the symbol, can effectively resist Inter-Symbol Interference (ISI), and improves the performance against multipath fading. Compared with traditional frequency division multiplexing (FDM), OFDM does not require a dedicated guard band. Although there will be overlap between the frequency spectrum, the various carriers are orthogo...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26
Inventor 但黎琳彭雨晨马千里孙兆杰肖悦郭万曹
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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