tailieunhanh - Báo cáo hóa học: " Performance analysis of OFDM modulation on indoor broadband PLC channels"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Performance analysis of OFDM modulation on indoor broadband PLC channels | Cortés et al. EURASIP Journal on Advances in Signal Processing 2011 2011 78 http content 2011 1 78 o EURASIP Journal on Advances in Signal Processing a SpringerOpen Journal RESEARCH Open Access Performance analysis of OFDM modulation on indoor broadband PLC channels José Antonio Cortés Luis Diez Francisco Javier Canete Juan José Sanchez-Martinez and José Tomás Entrambasaguas Abstract Indoor broadband power-line communications is a suitable technology for home networking applications. In this context orthogonal frequency-division multiplexing OFDM is the most widespread modulation technique. It has recently been adopted by the ITU-T Recommendation and is also used by most of the commercial systems whose number of carriers has gone from about 100 to a few thousands in less than a decade. However indoor power-line channels are frequency-selective and exhibit periodic time variations. Hence increasing the number of carriers does not always improves the performance since it reduces the distortion because of the frequency selectivity but increases the one caused by the channel time variation. In addition the long impulse response of power-line channels obliges to use an insufficient cyclic prefix. Increasing its value reduces the distortion but also the symbol rate. Therefore there are optimum values for both modulation parameters. This article evaluates the performance of an OFDM system as a function of the number of carriers and the cyclic prefix length determining their most appropriate values for the indoor power-line scenario. This task must be accomplished by means of time-consuming simulations employing a linear time-varying filtering since no consensus on a tractable statistical channel model has been reached yet. However this study presents a simpler procedure in which the distortion because of the frequency selectivity is computed using a time-invariant channel response and an analytical expression is derived for the one caused by

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