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This paper studies the performance of a superposition based approach for multi-user access in the uplink of a wireless cell. The approach uses non-orthogonal signaling and multi-user detection on top of an orthogonal multiple-access method like OFDMA. Path losses depending on the distance between a terminal and the base station and cancellation errors during multi-user detection are taken into account...
As the traffic grows rapidly in wireless communication, the spectrum becomes scarce. The current inefficient fixed spectrum allocation schemes will not satisfy the growing spectrum demand. This paper proposes a double auction based dynamic spectrum sharing scheme for multiple operators adopting OFDMA in the downlink. More specifically, this scheme allows free subcarriers trading between operators...
In current wireless standards like 3GPP LTE or IEEE 802.16 / WiMAX multiple access is based on orthogonal signalling using single-carrier frequency-division multiple access (SC-FDMA) or orthogonal frequency-division multiple access (OFDMA). Links between a base station and different terminals use mutually orthogonal radio resources. This paper studies potential gains in average cell throughput by...
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