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In vehicular communications, the channel estimation is critical to compensate signal distortion due to wireless channel in high mobility scenario. To improve the error performance of vehicular communications, we proposed the midamble-based channel estimation scheme. Based on the proposed scheme, we investigate the effect of midamble insertion on the system performance. With various midamble insertion...
Cooperative networks have been considered for their spatial diversity benefit in wireless communications. The signal in the cooperative networks can be transmitted by a repetitive manner or using space-time codes. For both transmission schemes, we consider the error performance and resource allocation employing differential modulation which bypasses the channel estimation at the transceiver. We derive...
We introduce vehicle multi-hop communication (VMC) project in Korea, which provides vehicle to vehicle and vehicle to Infra communications. At first, technical issues such as high mobility, low packet latency and high density are discussed. And we propose Mid-amble based channel estimation and hybrid MAC for vehicle safety and traffic information applications. Mid-amble based channel estimation is...
Rapid frequency and frame synchronization scheme is proposed to minimize channel switching time and improve the synchronization performance during channel switching in IEEE 802.11p standard. As a measure of performance, theoretical formula for false alarm and detection probability is derived. It is shown that optimal threshold value is less than 0.5 dB and overall performance gain is given by the...
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