M. El-Tokhy

Optimization of Bluetooth Frame Format for Efficient Performance

This paper presents a modification for Bluetooth frame structure to improve its performance over both Additive White Gaussian Noise (AWGN) and fading channels. The paper investigates the effect of using different block codes on the performance of the Bluetooth system. Both Hamming and BCH codes with different lengths are studied as error control codes for the Bluetooth frame. Experimental results reveal that shorter Hamming codes have a better performance in AWGN channels. Also, the BCH (15, 7) code has a better performance for interleaved channels. All this work is devoted to Bluetooth 1.1 version.

Performance of the audio signals transmission over wireless networks with the channel interleaving considerations

This article studies a vital issue in wireless communications, which is the transmission of audio signals over wireless networks. It presents a novel interleaver scheme for protection against error bursts and reduction the packet loss of the audio signals. The proposed technique in the article is the chaotic interleaver; it is based on chaotic Baker map. It is used as a randomizing data tool to improve the quality of the audio over the mobile communications channels. A comparison study between the proposed chaotic interleaving scheme and the traditional block and convolutional interleaving schemes for audio transmission over uncorrelated and correlated fading channels is presented. The simulation results show the superiority of the proposed chaotic interleaving scheme over the traditional schemes. The simulation results also reveal that the proposed chaotic interleaver improves the quality of the received audio signal. It improves the amount of the throughput over the wireless link through the packet loss reduction.

Image transmission over mobile Bluetooth networks with enhanced data rate packets and chaotic interleaving

Bluetooth is a wireless personal area network. This type of networks is widely used for image communication. This paper presents a study for the transmission of images over mobile Bluetooth networks. It presents a novel chaotic interleaving scheme for this purpose. In this scheme, the chaotic Baker map is used for bit interleaving and enhanced data rate packets are used for data transmission. In the proposed scheme, the chaotic interleaver can be applied on the whole bit stream or on a packet-by-packet basis. The proposed scheme is applied with 2DH1, 2DM1, 3DH5, and 3DM5 packets. A comparison study between the proposed scheme and the traditional interleaving schemes for image transmission over correlated and uncorrelated fading channels is presented. The simulation results show the superiority of the proposed scheme over the traditional schemes. The proposed scheme also adds a degree of security to data transmission.

JPEG image transmission over mobile network with an efficient channel coding and interleaving

This article studies improving of coloured JPEG image transmission over mobile wireless personal area network through the Bluetooth networks. This article uses many types of enhanced data rate and asynchronous connectionless packets. It presents a proposed chaotic interleaving technique for improving a transmission of coloured images over burst error environment through merging it with error control scheme. The computational complexity of the used different error control schemes is considered. A comparison study between different scenarios of the image transmission is held in to choose an effective technique. The simulation experiments are carried over the correlated fading channel using the widely accepted Jakes’ model. Our experiments reveal that the proposed chaotic interleaving technique enhances quality of the received coloured image. Our simulation results show that the convolutional codes with longer constraint length are effective if its complexity is ignored. It reveals also that the standard error control scheme of old Bluetooth versions is ineffective in the case of coloured image transmission over mobile Bluetooth network. Finally, the proposed scenarios of the standard error control scheme with the chaotic interleaver perform better than the convolutional codes with reducing the complexity.

Bluetooth performance improvement over different channels through channel coding

It is known that Bluetooth systems employ a Hamming (15, 10) code for error correction. In this paper, we propose different error correction coding schemes for this purpose. A comparison study between the Hamming (7, 4), the cyclic (15, 11) and the BCH (15, 7) codes is held in the paper to choose an alternative to the Hamming (15, 10) code. The simulation experiments are held over both an Additive White Gaussian Noise (AWGN) channel and a Rayleigh fading channel. The experimental results reveal the superiority of the BCH (15, 7) code to all other coding schemes if a large redundancy is accepted. If the issue of redundancy is of major concern, the Hamming (7,4) code is the best.

Switched-capacitor filter based on unity gain buffer for high speed analog signal processing applications

In this paper a new voltage buffer to realize high speed and low power dissipation switched-capacitor filters is proposed. The drain-follower achieves 300MHz bandwidth with 2pF load; DC gain of 0.993V/V, 1mV offset voltage, −60 dB total harmonic distortion at 0.4 VPP output voltage and 58.5µW power dissipation from 1.5V supply. A unity-gain buffer switched-capacitor biquad filter has been implemented in 0.5µm CMOS technology. The circuit has been sending for fabrication. Simulation results of the biquad filter indicate operation at 100 MHz with 6mW power consumption from a 1.5 V supply can be achieved.

Enhancing the Image Transmission over Wireless Networks through a Novel Interleaver

With increasing the using of wireless technologies in essential fields such as the medical application, this paper proposes different scenarios for the transmission of images over wireless networks. The paper uses the IEEE ZigBee 802.15.4 for applying the proposed schemes. It is a Wireless Personal Area Network (WPAN). This paper presents a novel chaotic interleaving scheme against error bursts. Also, the paper studies the proposed interleaver with the convolutional code with different constraint lengths (K). A comparison study between the standard scheme and proposed schemes for image transmission over a correlated fading channel is presented. The simulation results show the superiority of the proposed chaotic interleaving scheme over the traditional schemes. Also, the chaotic interleaver packet-by-packet basis gives a high quality image with (K=3) and reduces the need for the complex encoder with K=7.

Studying the throughput efficiency of JPEG image transmission over mobile IEEE 802.15.1 network using EDR packets

Throughput is one of the most important factors in wireless communication. This paper studies the throughput efficiency of Bluetooth network using Enhanced Data Rate (EDR) packets. This paper, proposes improving the throughput efficiency of JPEG image transmission over mobile Bluetooth network using Enhanced Data Rate (EDR) packets. This paper uses the 2DH3 and proposed 2DM3 EDR Asynchronous Connectionless (ACL) packets. This paper presents a proposed using efficient error control schemes to improve the throughput of Bluetooth systems. A comparison study between different propositions is held in the paper to choose an efficient case over mobile Bluetooth network. The simulation experiments are carried over correlated Rayleigh fading channel. Our experiments reveal that the proposed convolutional code with constraint length K=3 and 7 improves the throughput efficiency of JPEG image at low SNR values. In our simulation results show that the convolutional codes are good over correlated fading channel more than the traditional Bluetooth error correction scheme for EDR Bluetooth packets. At higher SNR values (SNR>28dB) the standard uncoded 2DH3 packets gives a good throughput. Finally, using convolutional code with different K values improves the throughput over mobile Bluetooth network.

Efficient image transmission over low-power IEEE802.15.1 network over correlated fading channels

The paper studies the colored image (JPEG) transmission over mobile Bluetooth network using Enhanced Data Rate (EDR) packets. The paper uses the 2DH3 EDR Asynchronous Connectionless (ACL) packets. It presents the proposed chaotic interleaving technique to improve a transmission of colored images over Bluetooth systems. Also, it studies different interleaving schemes for this purpose. A comparison study between different propositions is held in the paper to choose an effective technique over mobile Bluetooth network. The fragmentation of the transmitted image is discussed. The simulation experiments are carried over correlated Rayleigh fading channel. Our experiments reveal that the proposed chaotic interleaving technique enhances the received colored image. In our simulation, we propose the image compression is lossless type. The experimental results reveal using the encoded EDR Bluetooth packets reduces the dropped packets. Also, the paper shows the standard error control scheme of old versions is ineffective in the case of colored image transmission over mobile Bluetooth network. The paper shows there is an error factor from fragmentation process where it determines the number of packets. JPEG image performs better with using chaotic interleaving.

Efficient error correction technique improving the efficiency of image transmission over a mobile Bluetooth networks

With increasing the applications fields of low-power short range wireless communication, especially Bluetooth, the most of these applications need transmitting image. This paper proposes improving the colored JPEG image transmission over mobile Bluetooth network using Enhanced Data Rate (EDR) packets with the 2DH3 and 2DM3 EDR Asynchronous Connectionless (ACL) packets. It proposes using efficient error control schemes to improve a transmission of colored images over Bluetooth systems. Also, it proposes different EDR packet formats for this purpose. A comparison study between different propositions is held in the paper to choose an efficient case over mobile Bluetooth network. The simulation experiments are carried over correlated Rayleigh fading channel. Our experiments reveal that the proposed convolutional code with constraint length K=3 and 7 enhances the received colored image over a bad channel. The simulation results show that the convolutional codes are good over correlated fading channel more than the traditional Bluetooth error correction scheme for EDR Bluetooth packets. The paper shows the standard error control scheme of old Bluetooth versions is ineffective in the case of colored JPEG image transmission over the mobile Bluetooth network. The proposed schemes provide packet latency. Also, it reduced the retransmission times with the lost frames reduction at low SNR.