An Integrated Broadcast-Broadband System That Merges ISDB-T With HbbTV 2.0

Robust Blind Detection of Integer Carrier Frequency Offset for Terrestrial Broadcasting Systems Using Band Segmented Transmission

“…Immediately, one can see that the trend of the curves is similar to that in Figure 3. Regardless of the ISDB-T mode, it is observed that the detection capability of the conventional IFO estimation methods (6) and (9) do not change. The reason for this is that its performance depends on the ratio of the number of data and null subcarriers.…”

“…This is mainly because the performance of (14) is affected by the ICI only, whereas the performance of (10) is dependent on both the ICI and phase rotation caused by f . When f = 0, the probability of erroneous detection of the blind estimation schemes (6) and (9) approaches zero when the SNR tends to infinity, whereas the probability of erroneous detection of the other schemes suffers from error floors. Due to the limited number of TMCC subcarriers in 2k mode, the blind estimation scheme (9) outperforms the proposed estimation scheme, whereas this phenomenon is reversed as N t grows in 4k mode.…”

“…More interestingly, the increased frequency selectivity gives rise to the performance degradation for all IFO estimators, when compared to the case of the flat fading channel. This phenomenon is more pronounced in the case of the blind estimation schemes (6) and (9). Due to its high vulnerability to frequency selectivity and residual FFO, there are some limitations to applying the conventional schemes (6) and (9) to the ISDB-T system.…”

“…This phenomenon is more pronounced in the case of the blind estimation schemes (6) and (9). Due to its high vulnerability to frequency selectivity and residual FFO, there are some limitations to applying the conventional schemes (6) and (9) to the ISDB-T system. In Figure 5, the probability of erroneous estimation of the IFO estimation methods for the ISDB-T 4k mode is illustrated as a function of f when SNR = 6 dB is fixed.…”

“…One special feature in the ISDB-T system is the combination of band segmented transmission (BST) and OFDM, which is known as BST-OFDM. Using different modulation and coding schemes (MCS) in one or more OFDM segments forms the basis of hierarchical transmission [4][5][6]. With the use of the segmented structure and hierarchical partition, different modulation modes, such as coherent and differential modulation, can be applied to different OFDM segments.…”