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In this paper we build a Software Defined Radio (SDR) testbed for the mobile broadcast system which using hierarchical modulation based on the USRP (Universal Software Radio Peripheral) platform. In hierarchical modulation, two separate data streams are modulated into one single stream. One stream, called the "High Priority" (HP) stream is embedded within a "Low Priority" (LP)...
Hybrid automatic repeat request (HARQ) protocol typically operates in multi-process stop-and-wait (SAW) mode to fully utilize channel capacity. A prior packet, due to retransmission(s), may arrive at the receiving side later than the packets that follow it but use other HARQ processes, thus leading to out-of-order reception. Medium access control (MAC) layer is responsible for packet reordering operations...
We develop and analyze an ARQ (Automatic Repeat reQuest) initialized transmit diversity protocol for cooperative communications. Medium access control (MAC) layer packet retransmission limit (similar to aShortRetryLimit or aLongRetryLimit in 802.11-1997) has been used as an actuator for transmit cooperative diversity initialization. We take the channel state information (CSI) as a function of retransmission...
This paper proposes an functional architecture supporting wireless mesh networks (WMNs) for IEEE 802.16 standard. Three essential techniques: collision avoiding, packet scheduling and wireless routing are intensively investigated. Based on the mesh extension of IEEE 802.16 medium access control (MAC) layer protocol and the relay-based characteristic of WMNs, the algorithms concerning with those three...
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