Near-optimal joint antenna selection for amplify-and-forward relay networks
This paper considers a joint antenna selection method in amplify-and-forward (AF) relay networks where the source, relay and destination terminals are all equipped with multiple antennas. The fact that the system's full diversity can be maintained by ...
Integration interval determination algorithms for BER minimization in UWB transmitted reference pulse cluster systems
A recently proposed transmitted reference pulse cluster (TRPC) structure contains compactly spaced reference and data pulses, and enables a low complexity, robust and practical auto-correlation detector to be used at the receiver. Previous research ...
Analysis of a simple recruiting method for cooperative routes and strip networks
The opportunistic large array (OLA) is the basis for a simple cooperative transmission protocol that is suitable for broadcasting in wireless sensor networks and in which every node transmits once per broadcast. OLA with transmission threshold (OLA-T) ...
Joint channel and network coding for cooperative diversity in a shared-relay environment
In this paper we propose a cooperative diversity scheme for the communication model of two sources sharing a single relay. The scheme uses algebraic code superposition relaying in the multiple access fading channel to create spatial diversity under the ...
Transmit beamforming with power adaptation in downlink multi-user systems
This paper addresses power adaptation in the context of beamforming in the downlink of a cellular system. Specifically, we consider a system consisting of a base station (BS) with multiple antennas and multiple users each with a single antenna, in which ...
A low-complexity scheme for frequency estimation in uplink OFDMA systems
Frequency estimation in the uplink of an orthogonal frequency-division multiple-access system is a challenging task due to the presence of multiple carrier frequency offsets. Many existing solutions are too complex for practical implementation, while ...
A novel multistage group detection technique and applications
In this letter, a multistage group detection (MSGD) approach to nonlinear equalization is proposed. At each stage, symbols are divided into groups, and maximum-likelihood detection (MLD) within the group is performed. The MLD process identifies a number ...
Distributed multicell-MISO precoding using the layered virtual SINR framework
In this letter, we address the problem of distributed multi-antenna cooperative transmission in a cellular system. Most research in this area has so far assumed that base stations not only have the data dedicated to all the users but also share the full ...
MIMO broadcast channels with spatial heterogeneity
We develop a realistic model for multiple-input multiple-output (MIMO) broadcast channels, where each randomly located user's average SNR depends on its distance from the transmitter. With perfect channel state information at the transmitter (CSIT), the ...
A reduced-complexity PTS-based PAPR reduction scheme for OFDM systems
In this paper, a reduced-complexity partial transmit sequences (PTS) scheme is proposed to resolve the intrinsic high peak-to-average power ratio (PAPR) problem of orthogonal frequency division multiplexing (OFDM) systems. In the proposed PTS scheme, a ...
Performance of optimum combining in a Poisson field of interferers and rayleigh fading channels
This paper studies the performance of antenna array processing in distributed multiple access networks without power control. The positions of nodes are determined by a Poisson point process. Desired and interfering signals are subject to both path-loss ...
An optimized iterative (turbo) receiver for OFDM systems with type-I hybrid ARQ: clipping and CFO cases
An optimized iterative (Turbo) receiver for Orthogonal Frequency Division Multiplexing (OFDM) transmission is proposed for improved performance when used with type-I hybrid Automatic Repeat Request (ARQ) protocols. The proposed receiver is a Maximum ...
End-to-end average BER in multihop wireless networks over fading channels
This paper addresses the problem of finding an analytical expression for the end-to-end Average Bit Error Rate (ABER) in multihop Decode-and-Forward (DAF) routes within the context of wireless networks. We provide an analytical recursive expression for ...
Malicious user detection in a cognitive radio cooperative sensing system
Reliable detection of primary users (PUs) is an important task for cognitive radio (CR) systems. Cooperation among a few spectrum sensors has been shown to offer significant gain in the performance of the CR spectrum-sensing system by countering the ...
Low complexity pre-equalization algorithms for zero-padded block transmission
The zero-padded block transmission with linear time-domain pre-equalizer is studied in this paper. A matched filter is exploited to guarantee the stability of the zero-forcing (ZF) and minimum mean square error (MMSE) pre-equalization. Then, in order to ...
The relay selection and transmission trade-off in cooperative communication systems
A common and practical paradigm in cooperative communication systems is the use of a dynamically selected 'best' relay to decode and forward information from a source to a destination. Such systems use two phases - a relay selection phase, in which the ...
Adaptive modulation for MIMC) systems with channel prediction errors
The performance of multiple-input multiple-output (MIMO) systems using spatial multiplexing is analyzed under channel prediction errors. We derive exact closed-form expressions for the conditional and average bit error rate (BER) for both fixed and ...
Multiuser cooperative multiplexing with interference suppression in wireless relay networks
In this paper, we consider multiuser cooperative multiplexing schemes in cellular networks with fixed relays and address the problem of inter-user interference. We propose two schemes to mitigate the effect of the interference: an interference ...
Pilot-aided multicarrier channel estimation via MMSE linear phase-shifted polynomial interpolation
Current wireless multicarrier systems commonly adopt pilot-aided channel estimation, for which a simplest and least restrictive technique is polynomial interpolation in the frequency domain. For channels with large delay spreads, however, the ...
Combination of MRC and distributed space-time coding in networks with multiple-antenna relays
Distributed space-time coding (DSTC) is a cooperative scheme for wireless relay networks that achieves full diversity without channel information at the relays. In this paper, the use of maximum-ratio combining (MRC) at multiple-antenna relays in ...
How much coherent interval should be dedicated to non-redundant diagonal p1recoding for blind channel estimation in single-carrier block transmission?
Transmit precoding is a key technique for facilitating blind channel estimation at the receiver but the impact due to precoding on the channel capacity is scarcely addressed in the literature. In this paper we consider the single-carrier block ...
Dynamic spectrum access using a network coded cognitive control channel
In this paper we propose a Dynamic Spectrum Access scheme which allows the users to opportunistically and efficiently access the channels available for communications. It addresses the following important aspects of opportunistic spectrum access: 1) ...
On the cyclostationarity of OFDM and single carrier linearly digitally modulated signals in time dispersive channels: theoretical developments and application
Previous studies on the cyclostationarity aspect of orthogonal frequency division multiplexing (OFDM) and single carrier linearly digitally modulated (SCLD) signals assumed simplified signal and channel models or considered only secondorder ...
Congestion-based pricing resource management in broadband wireless networks
Supporting the diverse QoS requirements of multimedia applications is an essential requirement for broadband wireless access (BWA) networks. Due to the projected dynamics in traffic patterns, more capable resource management functionalities are needed. ...
A game theoretical approach to distributed relay selection in randomized cooperation
In this paper, the problem of node management in the presence of randomized cooperation is tackled. First, game theory is exploited to model the problem of setting up a cluster of cooperative nodes in a wireless network as a multiplayer noncooperative ...
Maximizing multicast call acceptance rate in multi-channel multi-interface wireless mesh networks
In this paper, we consider the problem of constructing bandwidth-guaranteed multicast tree in multi-channel multiinterface wireless mesh networks. We focus on the scenario of dynamic multicast call arrival, where each call has a specific bandwidth ...
Cooperative decode-and-forward ARQ relaying: performance analysis and power optimization
In this paper we develop a new analytical methodology for the evaluation of the outage probability of cooperative decode-and-forward (DF) automatic-repeat-request (ARQ) relaying under packet-rate fading (fast fading or block fading) channels, where the ...
Key infection, secrecy transfer, and key evolution for sensor networks
Sensor networks are composed of a large number of low power sensor devices. For secure communication among sensors, secret keys are required to be established between them. Considering the strict resource constraints of sensors, key infection has been ...
Cellular systems with non-regenerative relaying and cooperative base stations
In this paper, the performance of cellular networks with joint multicell processing and dedicated relay terminals is investigated. It is assumed that each relay terminal is capable of full-duplex operation and receives the transmission of relay ...
A new queueing model for QoS analysis of IEEE 802.11 DCF with finite buffer and load
Quality of Service (QoS) and queue management are important issues for IEEE 802.11 systems. However, existing 2-dimensional (2-D) Markov chain models of 802.11 systems are unable to capture the complete QoS performance and queueing behavior due to the ...
