2009 International Conference on Advanced Technologies for Communications

Summary form only given. This talk will address the current trend of converging telecommunications and broadcasting in the broadband era. Detailed topics include: (1) Economic impact to the ICT industries, (2) National strategy of ICT in Japan, (3) Current situation of the broadband infrastructure in Japan, (4) New trend of ICT services in Japan, (5) New legal framework for the convergence of tele... View full abstract»

Summary form only given. In this presentation, a new wireless communication scheme ??adaptation-to-environment type baseband radio?? which realizes a software radio and/or cognitive radio concept is proposed, and a fundamental experiment is performed to confirm the feasibility of the proposed scheme. The baseband radio discussed here means the scheme which generates a radio wave directly by baseba... View full abstract»

This paper proposes an improved lattice-reduction aided (LRA) MMSE detection by combining the LLL algorithm and the Gram-Schmidt (GS) procedure. The proposed detection reduces the column vectors of the MIMO channel matrix using the LLL algorithm and the GS procedure to create mutually purely orthogonal column vectors of the reduced channel matrix. Then the decision boundary becomes the same as tha... View full abstract»

In this paper, we derive closed form expressions for average symbol error rate of M-ary signalling for MIMO-MRC (MRT) systems over Rayleigh fading channels taking account of channel estimation errors. Following the moment generating function (mgf), we formulate the final expressions in the form of hypergeometric functions. The expressions are valid for an arbitrary number of antennas and any modul... View full abstract»

In this contribution, we investigate the impact of channel correlation on the ergodic capacity, capacity statistics and symbol error rate (SER) for maximal ratio combiner (MRC) multichannel diversity systems over correlated Rayleigh fading channels. We derive exact closed-form expressions for average channel capacity, an upper bound and its asymptotically tight approximation. The capacity statisti... View full abstract»

Dirty paper coding scheme (DPC) is known to be a capacity achieving transmission technique in downlink multiuser MIMO channels. As a suboptimal solution to DPC, a precoding technique called successive zero-forcing dirty paper coding (SZF-DPC) has been proposed recently. The condition for the existence of the precoding matrices in SZF-DPC restricts the capability of supporting multiple users simult... View full abstract»

The WAI (WLAN authentication infrastructure), is the authentication protocol in the Chinese Wireless LAN standard. This protocol, similar as 802.11i, adopts port-based access control and involves three entities in the authentication process. The three entities named in Chinese standard are ASUE (wireless device), AE (access point) and ASE (authentication server). The WAI is composed of a mutual pu... View full abstract»

Signing electronic messages authentication is an issue of significant importance for computer and telecommunication systems. To solve efficiently some special practical problems the multisignature protocols are applied. New multisignature protocols based on the elliptic curves and discrete logarithm problem in finite groups are proposed to solve the problem of simultaneous signing contracts. The p... View full abstract»

Facial expression recognition (FER) is an important task in human-computer interaction systems to include emotion processing. In this work we present the recognition of facial expressions in OFDM systems. The original image is converted to binary code then it is transmitted via OFDM over a multi-path fading channel. The features are then extracted from the reconstructed image at the receiver based... View full abstract»

In this paper, we implement Bose-Chaudhuri-Hocquenghen (BCH) coding to study the performance of Power Line Channel (PLC) impaired by impulsive noise and AWGN. Quadrature amplitude modulation (QAM) is employed and orthogonal frequency division multiplexing (OFDM) is used as a transmission scheme. Block truncation coding (BTC) is used for the compression of the image. A comparison is made between un... View full abstract»

Noise in the power line channel can not be described by Additive White Gaussian Noise (AWGN). This channel suffers from impulsive noise and other narrow-band interferences. Impulsive noise, in particular, can degrade the performance of OFDM-based Power Line Communication (PLC) systems significantly. Due to its simplicity, clipping is a popular technique for impulsive noise reduction. In this paper... View full abstract»

Noise in the power line channel can not be described by additive white Gaussian noise (AWGN). This channel suffers from impulsive noise and other narrow-band interferences. Impulsive noise, in particular, can degrade the performance of OFDM-based power line communication (PLC) systems significantly. Therefore, channel coding is important to combat the impairments in this hostile medium. Interleavi... View full abstract»