Modulation Identification Method of the Subcarriers with  Pilots for OFDM Signals

doi:10.13190/jbupt.201204.42.liumq

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2012, Vol. 35 ›› Issue (4): 42-45.doi: 10.13190/jbupt.201204.42.liumq

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Modulation Identification Method of the Subcarriers with Pilots for OFDM Signals

LIU Ming-qian1, LI Bing-bing1,ZHAO Lei1, ZHAO Yan2

1State Key Laboratory of Integrated Service Networks, Xidian University  2School of Information and Communication Engineering, Beijing University of Posts and Telecommunications

Received:2011-07-18 Revised:2012-04-23 Online:2012-08-28 Published:2012-07-08
Supported by:
the National Natural Science Foundation of China

Abstract

Abstract:

A new modulation recognition method of the subcarriers with pilots for orthogonal frequency division multiplexing (OFDM) signals is proposed. The method firstly identifies null subcarrier signals of the OFDM and the pure pilot subcarrier signals by combination features of higher order cumulants in the equivalent model of OFDM. Then, it recognizes the modulated subcarrier signals which are less affected by pilots using comparing the variance of sequences in the minimum ring of vectogram. Simulation shows that the proposed method is effective and feasible in the multipath channels.

Key words: modulation identification, orthogonal frequency division multiplexing, higher order cumulant, vectogram

CLC Number:

TN911.7

LIU Ming-qian, LI Bing-bing,ZHAO Lei, ZHAO Yan. Modulation Identification Method of the Subcarriers with Pilots for OFDM Signals[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2012, 35(4): 42-45.

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Modulation Identification Method of the Subcarriers with Pilots for OFDM Signals

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