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LDPC (Low Density Parity Check) is widely used in many telecommunication systems due to its excellent performance. However, real-time LDPC decoder in virtual radio system is difficult to realize. Taking CMMB (China Mobile Multimedia Broadcasting) for instance, this paper proposes a method to achieve high throughput decoder based on x86 processors which support SIMD (Single Instruction Multiple Data)...
The TCP flow fairness problem in 802.11 based multihop ad hoc networks was studied in this paper. Firstly, a probability model was established to describe the TCP flow fairness, and its rationality was verified by simulation; Then, a new MAC layer scheme with low overhead cost was proposed, in which the backoff window at MAC layer was controlled by detecting the basic factors that lead to the TCP...
EPCglobal Gen2 for passive RFID system uses probabilistic slotted ALOHA with Q algorithm, which is a kind of dynamic framed slotted ALOHA (DFSA), as the tag anti-collision algorithm. In this paper, we analyze the performance of Q algorithm used in Gen2 and compare the tag estimation methods for DFSA. We also propose a new hybrid anti-collision Q algorithm, which combines the conventional Q algorithm...
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