tailieunhanh - Báo cáo hóa học: " Zero-Forcing Frequency-Domain Equalization for Generalized DMT Transceivers with Insufficient Guard Interval"

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: Zero-Forcing Frequency-Domain Equalization for Generalized DMT Transceivers with Insufficient Guard Interval | EURASIP Journal on Applied Signal Processing 2004 10 1446-1459 2004 Hindawi Publishing Corporation Zero-Forcing Frequency-Domain Equalization for Generalized DMT Transceivers with Insufficient Guard Interval Tanja Karp Department of Electrical and Computer Engineering Texas Tech University Lubbock TX 79409 USA Email Steffen Trautmann Infineon Technologies Austria AG Development Center Villach Siemens Strasse 2 9500 Villach Austria Email Norbert J. Fliege Institute of Computer Engineering Mannheim University 68131 Mannheim Germany Email fliege@ Received 28 February 2003 Revised 16 September 2003 We propose a zero-forcing frequency domain block equalizer for discrete multitone DMT systems with a guard interval of insufficient length. In addition to the insufficient guard interval in the time domain the equalizer takes advantage of frequency domain redundancy in the form of subcarriers that do not transmit any data. After deriving sufficient conditions for zero-forcing equalization that is complete removal of intersymbol and intercarrier interference we calculate the noise enhancement of the equalizer by evaluating the signal-to-noise ratio SNR for each subcarrier. The SNRs are used by an adaptive loading algorithm. It decides how many bits are assigned to each subcarrier in order to achieve a maximum data rate at a fixed error probability. We show that redundancy in the time domain can be traded off for redundancy in the frequency domain resulting in a transceiver with a lower system latency time. The derived equalizer matrix is sparse thus resulting in a low computational complexity. Keywords and phrases discrete multitone modulation insufficient guard interval zero-forcing frequency domain equalization noise enhancement system latency time. 1. INTRODUCTION Discrete multitone DMT modulation has been standardized for high data rate transmission over twisted-pair copper wires such as in .

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