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Hybrid ARQ (HARQ) and link adaptation (LA) are two powerful techniques to improve the data throughput in wireless communication systems. However, when integrated with LA, conventional HARQ does not provide much gain over LA without significantly increasing the number of retransmissions and initial coding rate. In this paper, we explore the feasibility of achieving high throughput by combining HARQ...
In this paper, we are interested in the optimal redistribution of the available budget in average transmit power per packet among potential packet transmission attempts for improved Automatic Repeat reQuest (ARQ) protocol. A conventional ARQ protocol was combined in [5], with both Adaptive Modulation and Coding (AMC) and Power Control (PC) to improve spectral efficiency, while satisfying an average...
This paper comprehensively studies the secure decode-and-forward (DF) relaying transmission in slow fading channels. To maximize the secrecy throughput under a secrecy outage probability constraint, we propose three adaptive transmission schemes (ATSs) with different complexity and flexibility, and design system parameters according to the instantaneous channel state information of the legitimate...
The secrecy outage of a two-user slow fading broadcast channel is studied in this paper. We consider the scenario where independent and confidential messages are transmitted to each user using superposition coding in the presence of an external eavesdropper. We assume the instantaneous channel state information (CSI) of the eavesdropper's channel is not available and the secrecy outage can be claimed...
Nowadays, LTE-based femtocell technology is a promising solution offering high-speed services, enhanced indoor coverage and increased system capacity. In such multi-user wireless communication systems, intelligently allocating resources is the substantial aim towards interference mitigation and enhancing power and spectral efficiencies. In this paper, we propose a joint power and channel allocation...
Intra-flow network coding was proposed in recent years as a way of enhancing TCP performance over wireless networks. Transmission reliability is improved by sending redundant coded packets instead of retransmitting data packets. In this paper, we discuss the complex issue of TCP interaction with network coding and identify how network coding hides indistinctively link and congestion losses from TCP...
Recently, LTE-based femtocell system has received significant attention as a promising solution offering high-speed services, enhanced indoor coverage and increased system capacity. Intelligently allocate resources in multi-user OFDMA-based network is the substantial aim towards interference mitigation and enhancing power and spectral efficiencies. In this paper, we propose a downlink joint resource...
In this paper we propose a new cooperative video multicast strategy, the so called Coordinated Multiple Relays (CoMR). The strategy is based on an efficient one-to-many resource sharing technique which exploits the space diversity of the two hop topology. The proposed scheme ensures a) significant gain in terms of coverage provided by relay deployment, b) boosted Signal to Interference and Noise Ratios...
Resource allocation for a downlink orthogonal frequency division multiple access (OFDMA) system ensures that capacity and throughput are maximized. In the literature, either channel coding is not considered or only a fixed code rate is specified. To overcome this problem, an optimized cross-layer resource allocation strategy that distributes the user, bit and power optimally has been proposed for...
In 802.16m network, mobile station can choose different transmission schemes: direct transmission, cooperative transmission, or cooperative network coding transmission. Different transmission scheme has different effects on network performance. Particularly relay selection method affects network throughput and the amount of network resource for cooperative transmission and cooperative network coding...
This paper proposes a downlink mapping algorithm for two-level requests in Orthogonal Frequency Division Multiple Access based IEEE 802.16e systems under the Adaptive Modulation and Coding (AMC) mode by which the modulation and coding scheme (MCS) of a user may be different for available subchannels. Given a set of requests each with two priorities, the proposed algorithm efficiently allocates a two-dimensional...
With rapid growing of wireless data service, heterogeneous network (HetNet) has evolved as an spectrum and energy efficient cellular network architecture. However, the inter-cell interference (ICI) between the macro-cell and small cells is complicated. Due to the transmit power difference between various nodes and the randomness of user locations, the network may work in strong, mixed or weak interference...
Collision Resistant Multiple Access (CRMA) to conduct multiple access problems is a new kind of spectrum shared protocol by the network coding. The virtual flow technology is the key technology of CRMA and contributes mostly to the high performance of the network. However, the efficiency of virtual flow technology drops with increase of physical flow caused by decoding failure and incomplete code...
In this paper, we consider scalable video multicast to LTE-A user groups. We focus on the problem in accommodating the varying channel conditions amongst group members to adaptively select modulation schemes that meet the desired QoS objectives for the bitstream layers. We envision a fair provisioning of the base layer to ensure baseline quality to all users and an opportunistic provisioning of the...
Network coding is a new data transmission method which is different from the traditional storage and forwarding routing technology. By using network coding, it can improve the throughput of the media multicast network. This paper study the layer rate allocation optimization problem based on network coding for media multicast network. By optimal allocating layer rate, the total rate of all receiving...
In conventional multicast scheme (CMS), the total throughput of multicast group is constrained by the user with the worst channel quality. In order to overcome this problem of limited throughput, we consider a resource allocation algorithm based on layered coding, when a limited feedback scheme is considered. A novel subcarrier and power algorithm is exploited for targeting the maximum throughput...
Ideally, the throughput of a Multipath TCP (MPTCP) connection should be as high as that of multiple disjoint single-path TCP flows. In reality, the throughput of MPTCP is far lower than expected. This is fundamentally caused by the fact that a sub flow with high delay and loss affects the performance of other sub flows, and thus becomes the bottleneck of the MPTCP connection and significantly degrades...
In video streaming, user-perceived quality is more important rather than user-receiving data rate, as well as fairness of user satisfaction should be considered. In cooperation with the adaptive modulation and coding schemes, a layered video multicast transmission may provide an efficient way to handle receiver heterogeneity and wireless channel heterogeneity, since different modulation and coding...
An adaptive coding scheme for spectral efficiency improvement in eigen-MIMO is presented. It uses Reed-Solomon (RS) codes with non-adaptive QAM. Non-adaptive modulation is of interest since it reduces the high complexity - in both the electronics and the protocol - required for deploying the more commonly treated adaptive modulation. RS codes have practical advantages in terms of their algorithmic...
We study a cooperative communication system consisting of two users in half duplex mode communicating with one destination over additive white Gaussian noise (AWGN). Cooperation is performed between the two users by partial decode-forward relaying over 3 time slots with variable duration. During the first two slots, each user alternatively transmits and partially decodes while during the last time...
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