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Ambient backscatter is a new technology that utilizes environmental wireless signals to enable battery-free devices to communicate with each other. In this paper, we investigate the problem of signal detection for the full duplex wireless system utilizing ambient backscatter. Since one of the key technologies of full duplex wireless system is self-interference cancellation, we first estimate the channel...
In this paper, we study a new full duplex relaying (FDR) network in which the relay has a buffer and works in decode-and-forward (DF) protocol. We investigate the performance of three models in terms of throughput, i.e., Full duplex relay without buffer-aided (conventional FDR), full duplex relay with unlimited buffer, and full duplex relay with limited buffer, respectively, and derive the closed-form...
This paper shows the system performance of time-division relaying against a blank subframe ratio (BSR) in an access link and transmission power for a relay node (RN). The average user throughput and the cell edge user throughput are described by system level computer simulation. Time-division relaying improves the average user throughput by 30% as compared to a conventional system when the transmission...
In cognitive radio networks (CRNs), secondary users (SUs) may employ network coding to pursue higher throughput. However, because SUs should not interfere with high-priority primary users (PUs), the available transmission time of SUs is usually uncertain, i.e., SUs do not know how long the idle state can last. Meanwhile, existing network coding strategies generally adopt a block-based transmission...
Unsegmented network coding (UNC) is a promising technology to overcome poor source information scheduling of segmented network coding (SNC) in large scale networks, where unresponsive feedback slacks the scheduling. However, three unsolved problems limit its applicability. First, UNC employs ACK on witness as the feedback. The frequently triggered witness-ACK will introduce considerable overhead and...
In This paper, we present a multi-core mapping implementation of 3780-point FFT as an application in DTMB system. By using SIMD commands and optimizing of specific modules, complication is decreased. Through the proper task arrangement we avoid the synchronizations and conflicts. A multi-core mapping based on multi-core processor can reach a high throughput up to 32.64 M Sample/s while the platform...
Unsegmented network coding was incorporated into opportunistic routing to improve inefficient schedule of segmented network coding due to delayed feedback. However, most unsegmented network coding schemes fail to constrain the size of decoding window. Large decoding window not only challenges limited computational ability and decoding memory in practical environments, but also introduces large decoding...
We investigate the maximum outage throughput for Orthogonal Frequency Division Multiple Access (OFDMA) systems in the presence of feedback channel capacity constraints. We attempt to establish an information-theoretic lower bound on the capacity of feedback channel and build the corresponding test channel that achieves this lower bound. Based on the derived test channel, we formulate the outage throughput...
This paper firstly introduces the compressed sensing theory that is very hot in recent research. Our research combines the compressed sensing with wireless sensor network to improve the prior classical formulas due to the great advantage of capabilities of compressing data in large scale wireless network. When the transmission data decrease sharply, the throughput increases obviously in our research...
The multi-resolution multicast service is an emerging service for future generation communication systems, supporting different service qualities for receivers with different capabilities. Under such a scenario, the radio resource arrangement becomes very complex but is important in order to enhance the overall system throughput. For multi-resolution multicast OFDM systems, we proposed an adaptive...
Based on the analysis of the node selfishness and the drawback of min-hop selection method as the unique routing selection criteria in ad hoc networks, a non-intrusive multi-metric ad hoc routing protocol-NIMR is presented. By computing and storing the node fame, NIMR greatly attenuates the influence of node selfishness; By crossing-design between MAC layer and network layer, we employ a non-intrusive...
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