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Most of the turbo decoding stopping criteria assume perfect channel reliability available at the receiver since they require a threshold based on signal-to-noise ratio (SNR) information. However, operational environments can vary according to frame sizes, code structures and channel reliability requirements, further aggravating the difficulty in threshold determination and convergence or non-convergence...
This paper evaluates a routing protocol called Better Approach to Mobile Ad hoc Networking (B.A.T.M.A.N.) for a wireless mesh network. Specifically, this paper describes the practical deployment of the outdoor wireless mesh network using a PC Engine™ embedded application called the ALIX3 series system. The actual measurement of the outdoor wireless mesh network performance is the utmost importance...
We describe an empirical study findings on the impact of throughput performance when transmission power is adjusted among access points in close-proximity network devices. The experiment was conducted in an office environment to emulate a dense wireless LAN network. We introduce a power adjustment mechanism based on cognitive learning one of the attributes which then triggers the power selection....
This paper describes the performance of singular value decomposition (SVD) estimation techniques for multiband orthogonal frequency-division multiplexing (OFDM) of ultra-wideband (UWB) system in Saleh-Valenzuela channel modelling. The performance of SVD estimation is compared against LS and MMSE methods corresponding to zero-padded of a UWB system. The crucial limitation in UWB system is strictly...
An optimized and efficient WiMAX signal detection is proposed using reconfigurable processor, namely the Tensilica Xtensa Processor Core. In this paper, we considered a digital signal processing (DSP) implementation of initial synchronization scheme for time division duplex mode in IEEE 802.16e OFDMA downlink transmission. Taking advantage of distinctive features of WiMAX preamble structure, a custom...
Sensing of spectrum holes constitute the fundamental step to utilize spectral resources efficiently in Cognitive Radio (CR). This new technology trends intends to alleviate the scarce and underutilized spectrum issues occurred in traditional fixed spectrum allotment. CR defined as dynamic spectrum usage of unlicensed (secondary) user in opportunistic manner without causing harmful interference to...
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