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Present day secure speech communication mainly deals with providing maximum security at the cost of minimum complexity. While doing so, they are mainly looking forward to the speech coders for compressing the speech signal thus minimizing the complexity. In this paper an algorithm is proposed that aims at exploiting the basic characteristics of speech signal, while designing such system with reduced...
Bluetooth is a low cost, low power; short-range radio technology intended to transfer data between cell phones, PDAs and other portable devices. Bluetooth is also used as a medium for voice communication between cell phones. This paper aim is to develop an application that allows a user to make use of mobile phones enabled with Bluetooth and PC's connected over local area network (LAN) in order to...
Multicast transmission enables a sender to distribute data to multiple intended receivers simultaneously. However, the multicast transmission should be reliable in erasure channel. Forward Error Correction (FEC) enables the lost packets to be recovered from some extra redundant packets without any retransmission. In this paper, we propose a new FEC codes, called Polynomial Interpolation codes (PI...
Different propagation mechanisms of the transmitted signal take place from the surrounding objects in an indoor scenario. The prediction of the reflection phenomenon is one of the important parameter of the ultra wideband (UWB) channel modeling. This paper presents a model of wave propagation in indoor environments for multiple reflections of UWB signal inside the building wall. The main objective...
We propose a transceiver structure that can effectively improve BER (bit error rate) performance for TR-UWB (transmitted reference-ultra wide band) systems based on impulse radios. Unlike coherent UWB systems that are too complex for practical implementation while having good BER performances, the complexity of the TR-UWB systems is quite low since they transmit data with the corresponding reference...
Wireless ad hoc networks are a type of wireless network that can be easily created without the need of network infrastructure or central administration. Unfortunately, wireless ad hoc networks suffer from some limitations related to the bandwidth leakage. So a proper data flow mechanism should be used to save the bandwidth consumption. So we proposed an XCAST based routing protocol (P-XCAST) to be...
We propose a spectrum sharing policy based on signal-to-interference-noise ratio (SINR) at a primary receiver. Contrast to the conventional spectrum sharing policy based on full channel state information (CSI) feedback, in our spectrum sharing policy, a secondary link can share the primary user's spectrum only using a binary state feedback for the interference link between a secondary transmitter...
Closed-form expressions for the capacity of dual-selection combining and maximal-ratio combining diversity systems over slowly varying correlated Hoyt fading channels has been presented. Different power and rate adaptation techniques available in the literature has been considered for the capacity analysis. A study on the effects of correlation and fading parameters on the channel capacity of the...
Application layer multicast is an alternative to network layer multicast. The existing application layer multicast approaches are focus on single source multicast and insufficient in supporting distributed applications that require multi-source and fast recovery abilities with dynamic membership. This paper proposes a novel application layer multicast and its proactive recovery approaches for multi-source...
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