Abstract
In this paper, an improved frequency offset estimation algorithm is proposed. It can effectively utilize pilot symbols in orthogonal frequency division multiplexing (OFDM) signals based on the Digital Radio Mondiale (DRM) system. In order to reduce the computational difficulty, the difference values of adjacent pilot symbols in the DRM system are sequentially combined into a pilot difference set. The pilot difference set is analyzed by inductive statistics so that the frequency offset estimator has higher calculation efficiency and accuracy. Through the induction statistics of multiple groups of symbols, the contingency of results can be effectively avoided. By comparing the performance of the proposed frequency offset estimator with that of the traditional estimators, the proposed algorithm has higher frequency offset estimation accuracy.
Highlights
The system named as Digital Radio Mondiale (DRM) originally mainly used a digital radio broadcasting specification below 30 MHz [1]
service description channel (SDC) is the channel for the multiplexed data stream that provides information for decoding and the services contained in the multiplex
0, where r represents the number of the transmission frame, s indicates the orthogonal frequency division multiplexing (OFDM) symbol number, and as,k is the amplitude, which selects one ofpthffiffie following values based on the robust mode adopted, f1, 2, 2g
Summary
The system named as Digital Radio Mondiale (DRM) originally mainly used a digital radio broadcasting specification below 30 MHz [1]. FAC is the channel for multiplexing data stream that contains the information which begins decoding the multiplex and is necessary to find the services. Aiming at the OFDM system of frequency-selective fading channels, Jiang et al proposed a frequency offset estimator based on a frequency-domain training sequence [10]. Under the frequency-selective fading channel, the problem of sampling frequency offset estimation based on the OFDM broadcasting system was proposed by Jung and You [12]. The residual carrier frequency offset estimation scheme of the OFDM broadcasting system based on cyclic delay diversity was proposed by Shin and You [14]. In this paper, based on the received audio data, the method of estimating the integer frequency offset by using an inductive method and calculating the fractional frequency offset by using the correlation of the pilots has been presented. Based on theoretical analysis and simulation, the proposed scheme is verified and it is proven that compared with the original methods, the calculation difficulty in this paper is significantly reduced and the accuracy is higher
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