A transceiver design of VHF band standardized broadband mobile communications systems

This paper evaluates BER performance of VHF band broadband mobile communication systems standardized as ARIB STD-T103 mode1. The ARIB STD-T103 mode 1 is based on IEEE 802.16-2009 standard with OFDMA because of its easy implementation. The IEEE 802.16-2009 based system is originally expected to operate in microwave bands such as 2.5 GHz with 512 FFT based OFDM in 5 MHz channel. However, the ARIB STD-T103 based system should tune the radio parameters of IEEE 802.16-2009 to suit for VHF band propagation characteristics because many multipath waves with long delay path are received in the VHF band. The ARIB STD-T103 mode 1 adopts OFDMA with 1024 FFT in 5 MHz channel and convolutional Turbo coding to cope with long delay multipath environments in VHF band such as IEEE 802.22 Profile A model. However, the BER performance in the environments has never been evaluated. This paper evaluates the BER performance with conventionally proposed receiving scheme by computer simulation. However, the performances of UL and DL with 64QAM do not achieve the required BER of ARIB STD-T103. To improve the BER performance this paper proposes three channel estimation schemes for DL. Although the BER performance with the schemes are not improved drastically, it is clarified that one of the proposals is expected to reduce size of storage in comparison with the conventional estimation schemes. With the estimation scheme and maximum ratio combined diversity achieves the required BER in both UL and DL.