On the Design of Frequency-Domain Receivers for SFN Where the Transmitters Have Different CFO
On the Design of Frequency-Domain Receivers for SFN Where the Transmitters Have Different CFO, Proc IEEE Military Communications Conf. - MILCOM, Baltimore, MD, United States, Vol. -, pp. - - -, November, 2011.
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In SFN (Single-Frequency Network) the terminals can received the same signal from different transmitters. This is especially interesting for broadcast and multicast systems since we can have full coverage without the need for different bands for different transmitters (i.e., we can have a frequency reuse factor of 1). Since the equivalent channel is the sum of the channels associated to each transmitter, the channel impulse response can be very long. For this reason, block transmission schemes such as OFDM (Orthogonal Frequency Division Multiplexing) and SC-FDE (Single-Carrier with Frequency-Domain Equalization) are usually employed in SFN. However, when we have different CFO (Carrier Frequency Offset) between the local oscillators at each transmitter and the local oscillator at the receiver we cannot compensate simultaneously the different CFO at the received signals, with can lead to significant performance degradation. In this paper we consider SFN and we study the impact of different CFO for different transmitters on the performance of block transmission schemes. We also present frequency-domain receivers suitable for the case where different transmitters have different CFO. Our performance results show that the proposed receivers are robust against different CFO at each transmitter.