Jongheon Lee

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This paper presents two channel aggregation schemes for wideband cognitive radio networks: a constant channel aggregation scheme and a variable channel aggregation scheme. In the variable channel aggregation scheme, the bandwidth of the cognitive user is aggregated with a probability distribution or aggregated on the basis of the number of the residual(More)
This paper proposes two algorithms for automatic repeat request (ARQ) feedback message transmission in IEEE 802.16m systems. The proposed algorithms determine the transmission interval of an ARQ feedback message on the basis of the number of transmitted ARQ blocks or the number of received ARQ blocks. If the receiver frequently transmits ARQ feedback(More)
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