Choosing the parameters of multiple-repetition strategies

The class of multiple-repetition strategies is known to achieve capacity for specific discrete memorylesschannels with noiseless feedback. We show, given an arbitrary discrete memoryless channel with noiselessfeedback, that the repetition parameters should be chosen close to the self information of a transmissionerror to maximise the...

Downlink resource allocation in beyond 3G OFDMA cellular systems

Orthogonal Frequency Division Multiplex (OFDM) based wireless communication is becoming a standard for providing broadband wireless services. OFDM is already deployed in various WLAN systems such as 802.11 a/g/e and in the mobile WiMAX systems (802.16e). The OFDM physical layer is also considered by 3GPP for the Long Term Evolution (LTE) of UMTS...

Performance modelieg of a bottleneck node in an IEEE 802.11 ad-hoc network

The IEEE 802.11 MAC-protocol, often used in ad-hoc networks, has the tendency to share the capacity equally amongst the active nodes, irrespective of their loads. An inherent drawback of this fair-sharing policy is that a node that serves as a relay-node for multiple flows is likely to become a bottleneck. This paper proposes a flow-level...

Bandwidth, Efficiency and Directivity Enhancement of Printed Antenna Performance Using Planar Circularly Symmetric EBGs

Planar Circularly Symmetric (PCS) Electromagnetic Band-Gap (EBG) substrates have been recently proposed to suppress the surface waves in printed technology [1] [2]. The major advantage of the PCS-EBGs with respect to structures based on vertical pins [3] [4] is the fabrication simplicity since the dielectric slabs do not need to be perforated....

Shallow-water acoustic communication with high bit rate BPSK signals

BPSK signals have been defined for transmission through a shallow-water acoustic communication channel. The signals were accompanied by two displaced carriers to facilitate carrier recovery. To correct for the adverse effects of time spreading, a pseudo-random learning sequence was transmitted ahead of the communication signal. The signal...