Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Blind Decoding of Multiple Description Codes over OFDM Systems via Sequential Monte Carlo | EURASIP Journal on Wireless Communications and Networking 2005 2 141-154 2005 Hindawi Publishing Corporation Blind Decoding of Multiple Description Codes over OFDM Systems via Sequential Monte Carlo Zigang Yang Texas Instruments Inc 12500 TI Boulevard Dallas MS 8653 Dallas TX 75243 USA Email zigang@ Dong Guo Department of Electrical Engineering Columbia University New York NY 10027 USA Email guodong@ Xiaodong Wang Department of Electrical Engineering Columbia University New York NY 10027 USA Email wangx@ Received 1 May 2004 Revised 20 December 2004 We consider the problem of transmitting a continuous source through an OFDM system. Multiple description scalar quantization MDSQ is applied to the source signal resulting in two correlated source descriptions. The two descriptions are then OFDM modulated and transmitted through two parallel frequency-selective fading channels. At the receiver a blind turbo receiver is developed for joint OFDM demodulation and MDSQ decoding. Transformation of the extrinsic information of the two descriptions are exchanged between each other to improve system performance. A blind soft-input soft-output OFDM detector is developed which is based on the techniques of importance sampling and resampling. Such a detector is capable of exchanging the so-called extrinsic information with the other component in the above turbo receiver and successively improving the overall receiver performance. Finally we also treat channel-coded systems and a novel blind turbo receiver is developed for joint demodulation channel decoding and MDSQ source decoding. Keywords and phrases multiple description codes OFDM frequency-selective fading sequential Monte Carlo turbo receiver. 1. INTRODUCTION Multiple description scalar quantization MDSQ is a source coding technique that can exploit diversity communication systems to overcome channel impairments. An MDSQ encoder generates multiple descriptions for a source and sends them .
