In digital radio broadcasting systems, long delays are incurred in service start time when tuning to a particular frequency because several synchronization steps, such as symbol timing synchronization, frame synchronization, and carrier frequency offset and sampling frequency offset compensation are...
In digital radio broadcasting systems, long delays are incurred in service start time when tuning to a particular frequency because several synchronization steps, such as symbol timing synchronization, frame synchronization, and carrier frequency offset and sampling frequency offset compensation are necessary. Therefore, the operation of the synchronization blocks causes delays ranging from several hundred milliseconds to a few seconds until the start of the radio service after frequency tuning. Furthermore, if spectrum inversed signals are transmitted in digital radio broadcasting systems, the receivers are unable to decode them, even though most receivers can demodulate the spectral inversed signals in analog radio broadcasting systems. Accordingly, fast synchronization techniques and a method for spectral inversion detection are required in digital radio broadcasting systems that are to replace the analog radio systems. This paper presents a joint detection method of frame, integer carrier frequency offset, and spectrum inversion for DRM Plus digital broadcasting systems. The proposed scheme can detect the frame and determine whether the signal is normal or spectral inversed without any carrier frequency offset and sampling frequency offset compensation, enabling fast frame synchronization. The proposed method shows outstanding performance in environments where symbol timing offsets and sampling frequency offsets exist.
In digital radio broadcasting systems, long delays are incurred in service start time when tuning to a particular frequency because several synchronization steps, such as symbol timing synchronization, frame synchronization, and carrier frequency offset and sampling frequency offset compensation are necessary. Therefore, the operation of the synchronization blocks causes delays ranging from several hundred milliseconds to a few seconds until the start of the radio service after frequency tuning. Furthermore, if spectrum inversed signals are transmitted in digital radio broadcasting systems, the receivers are unable to decode them, even though most receivers can demodulate the spectral inversed signals in analog radio broadcasting systems. Accordingly, fast synchronization techniques and a method for spectral inversion detection are required in digital radio broadcasting systems that are to replace the analog radio systems. This paper presents a joint detection method of frame, integer carrier frequency offset, and spectrum inversion for DRM Plus digital broadcasting systems. The proposed scheme can detect the frame and determine whether the signal is normal or spectral inversed without any carrier frequency offset and sampling frequency offset compensation, enabling fast frame synchronization. The proposed method shows outstanding performance in environments where symbol timing offsets and sampling frequency offsets exist.
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제안 방법
The number of observed symbols is 40 (the number of symbols for one frame). In these simulations, the starting point of the FFT window is estimated by using the guard interval based OFDM symbol timing synchronization, which means that there are some symbol timing offsets in the FFT process depending on the path values of the multipath channel. The solid lines show the performances of the proposed method, and the dotted lines represent the performances of the conventional method.
In this paper, we propose a joint detection method for frame, integer carrier frequency offset, and spectrum inversion for DRM Plus digital broadcasting systems using the difference among reference cells of the first OFDM symbol in the transmission frame. The auto-correlation is taken by using the received reference cells and their phase differences.
In this paper, a joint method for fast initial synchronization – transmission frame detection and integer carrier frequency offset estimation – and spectrum inversion detection in DRM Plus systems was suggested. Simulation of the proposed method showed outstanding detection performance due to robustness to the initial (residual) symbol timing offset and the sampling frequency offset.
In this paper, a joint method for fast initial synchronization – transmission frame detection and integer carrier frequency offset estimation – and spectrum inversion detection in DRM Plus systems was suggested. Simulation of the proposed method showed outstanding detection performance due to robustness to the initial (residual) symbol timing offset and the sampling frequency offset. The receiver structure for the proposed method was also presented.
The receiver structure for the proposed method was also presented. The proposed method enables fast frequency tuning of the DRM Plus receiver since the time consuming compensation techniques for symbol timing offset and sampling frequency offsets are not needed. This means that the receiver can offer faster audio service through the proposed joint detection method in a real environment because the estimation and compensation for the sampling frequency offset is not needed in the initial synchronization but only in the tracking stage.
They examined the effect of sampling frequency offset on the frequency-domain frame detection performance under the assumption of a fixed initial symbol timing offset (< the sampling period).
This paper also shows the relationship between symbol timing offset in finding FFT window point within sampling frequency offset and detection performance, suggests the receiver’s structure with the proposed method.
대상 데이터
The subcarrier spacing is 444 4/9 Hz, and there are 213 subcarriers.
이론/모형
DRM Plus receivers have to find OFDM symbol timing for FFT windowing first. The guard-interval correlation method is used to find the FFT windowing point [9]. To find the OFDM symbol timing, 80 OFDM symbols (200 ms) are used.
성능/효과
6% detection probabilities at 10ppm sampling frequency offset in urban, rural and terrain, respectively. However, the proposed method yields 95%, 97%, and 91.2% detection probabilities in the same environments.
The reference cells’ subcarrier index term of α is more diffused than that of β. Therefore, the performance of the proposed method is relatively better than that of the conventional method, and fast detection without high-precision compensation is possible.
참고문헌 (17)
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