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A novel belief propagation algorithm with gradual edge removal (ERBP) is proposed for Raptor codes over additional white gaussian noise (AWGN) channel. Specifically, the variable nodes with sufficiently high confidence and the corresponding edges are removed gradually from the Tanner graph during the BP iterations so as to reduce the decoding complexity. Then considering the intrinsic nature of incremental...
A new bit-interleaved polar coded modulation (BIPCM) scheme is proposed. To reduce the construction complexity, the simplest kernel matrix for channel polarization is adopted. And auxiliary virtual channels with zero-capacities are introduced to adapt different modulation orders. The underlying polar codes are efficiently constructed by calculating the Bhattacharyya parameters of equivalent binary-input...
In this paper, we investigated the cooperative sensing in a heterogeneous cognitive radio (CR) network scenario, where each secondary user (SU) may be equipped with different number of receive antennas and have different signal processing capacity, e.g., sampling rate. By considering the discrepancy in sensing reliability of different SUs, we extended the existing researches to propose an optimal...
Noncoherent pulse-position modulation (PPM) with simple channel codes has the potential to realize ultra-low power (ULP) wireless design. In this paper, we develop a Wagnerlike decoding rule for single-parity-check and high-rate Reed-Solomon (RS) coded PPM schemes by simply ‘flipping’ the most unreliable received PPM symbol(s) to obtain a good balance between performance and coding complexity. The...
Emerging two-path successive relaying protocols generally rely on error-free source-relay channels and/or interference-free inter-relay channels to achieve high-rate and full-diversity. In this paper, by removing these optimistic assumptions, a novel two-path successive relaying scheme that benefits from relay selection and distributed space-time block coding (STBC), and transfers the data from the...
The design of energy-efficient communication strategies is needed to extend the lifetime of Machine-to-Machine low power devices operating in realistic wireless fading and shadowing channels. In this paper, we assess the suitability of using cooperative and duty-cycled retransmissions (CDC-ARQ) in realistic low power networks to improve their energy-efficiency. A CDC-ARQ scheme achieves this goal...
In this paper, a novel parameter named cross-tier interference to signal ratio (CISR) is defined to characterize cross-tier interference in the co-channel deployed two-tier macro and femto networks. Cross-tier interference to signal budget (CISB) is derived to characterize the tolerance of cross-tier interference for given per-tier downlink signal to interference ratio (SIR) targets and outage probability...
Cognitive Radio (CR) has emerged as the promising technology to address spectrum scarcity issues. One of the challenging tasks in CR networks is to agree on a common control channel to advertise the free channel list (FCL) amongst the participating CR nodes for co-operative communication. In this paper, a CR MAC protocol for searching, scanning, and accessing the control channel is proposed. The protocol...
Wireless sensor networks (WSNs) have strict energy consumption requirements. Moreover, the complexity constraints of the nodes and the wireless dynamics must be considered in real life implementations. CTP (Collection Tree Protocol) is a state-of-the-art routing protocol that considers the main issues that arise in practical WSN applications. Nowadays, commercial wireless sensors can adjust their...
Disjoint multipath routing is an attractive approach for improving the reliability of data delivery in wireless sensor networks. Recently, the issue for maintaining the robustness and efficiency of the disjoint multipath routing against network failures such as network holes are being studied. Several protocols have been proposed to handle the network failures. However, they cause the large performance...
Cooperative spectrum sensing is employed in Cognitive Radio (CR) networks to reliably detect Primary User (PU) transmissions by fusing the sensed data of multiple Secondary Users (SUs). The local detection reliability of an individual SU is closely related to its channel condition. In this paper, we propose a scheme that uses SNR to evaluate the reliability of each individual SU's local decision....
To support long-term pervasive healthcare services, communications in Wireless Body Area Networks (WBANs) need to be both reliable and energy-efficient. As a cooperative transmission method, relay transmission scheme works effectively in resisting shadowing effect and improving reliability in WBANs. However, the extra energy consumption introduced by relay transmission is very high, which can shorten...
A wireless Body Area Network (BAN) consists of multiple radio-enabled wearable and implantable sensor nodes for use inside or in proximity to the human body. BANs are expected to balance requirement for reliable communication of their nodes with a need for battery energy conservation to ensure their longevity. The main challenge in managing this tradeoff is the inability of interfering BANs to explicitly...
To increase cognitive radio operation efficiency, this paper proposes a new knowledge management functional architecture, based on the fittingness factor concept, for supporting spectrum management in non-stationary environments. It includes a reliability tester module that detects, based on hypothesis testing, relevant changes in suitability levels of spectrum resources to support a set of heterogeneous...
In this paper, we consider relay-aided wireless multicasting where one source transmits the same information to multiple destinations. We assume that there is a half-duplex regenerative relay station (RS) which may cooperatively assist the source. Our underlying problems are two-fold: when and how should the source and the RS cooperate to improve the multicast rate? Firstly, we show the required conditions...
With the increasing demand for traffic safety and efficiency and constant search for innovative solutions within the automotive market coupled with supporting initiatives from regulatory domains, the potential of Intelligent Transportation Systems (ITS) is immense. Basic vehicle and roadside infrastructure collaboration allows an increase in efficiency and safety and acts as the foundation for an...
Through the wide deployment of high-speed rails around the world, multimedia services on high-speed trains will be highly demanded in the near future. However, network round trip time and packet loss rate for high-speed rail reception are much higher and also of high variance. To facilitate the delivery of a live video streaming service, our previous research suggests that the video streaming service...
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