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— In mobile multihop communications, diversity technique is important since the channel between mobile terminals may suffer from effects of fading and the routes between terminals are normally created through several hops. Space-time code using multiple transmit antennas is effective countermeasure for fading. For terminals which have only one antenna due(More)
This paper proposes a Multi-hop Radio Access Cellular (MRAC) scheme for achieving both high-speed/high-capacity and good area coverage in fourth generation mobile communications systems. In this scheme, we assume two kinds of hop stations, one is a dedicated repeater station installed at a good propagation location such as a rooftop, and the other is a user(More)
SUMMARY The spectral efficiency of cooperative relaying in interference-limited environments in which a given channel is spatially reused is investigated. Cooperative relaying is a promising technique that uses neighboring stations to forward the data toward the destination in order to achieve spatial diversity gain. It has been reported that by introducing(More)
SUMMARY Reliable detection of other radio systems is crucial for systems that share the same frequency band. In wireless communication channels , there is uncertainty in the received signal level due to multipath fading and shadowing. Cooperative sensing techniques in which radio stations share their sensing information can improve the detection probability(More)