Title :
Performance of fractionally spaced linear and decision-feedback equalizers for multitone systems
Author_Institution :
Remote Sensing Lab., Katholique Univ., Leuven, Belgium
Abstract :
When OFDM or multitone modulation is used, the channel dispersion is usually circumvented by means of the technique of guard time. As an alternative it is possible not to use a guard time but design receivers able to equalize the intersymbol interference (ISI) and inter-carrier interference (ICI). In the present paper we show how to design fractionally spaced linear or decision-feedback MIMO equalizers for multitone systems without guard time. Full complexity and reduced complexity solutions are investigated. The design is made for an MMSE criterion and the steady-state performance is analyzed. The performance of these detectors is investigated for BPSK modulation of the tones. In addition the robustness of the fractionally spaced detectors against timing errors is demonstrated
Keywords :
MIMO systems; computational complexity; decision feedback equalisers; equalisers; frequency division multiplexing; intersymbol interference; least mean squares methods; matched filters; phase shift keying; BPSK modulation; ISI; MIMO equalizers; MMSE criterion; OFDM; channel dispersion; decision-feedback equalizers; fractionally spaced linear equalisers; full complexity solutions; inter-carrier interference; intersymbol interference; matched filtering; multitone modulation; multitone systems; reduced complexity solutions; robustness; steady-state performance; timing errors; Binary phase shift keying; Detectors; Equalizers; Intersymbol interference; MIMO; OFDM modulation; Performance analysis; Robustness; Steady-state; Timing;
Conference_Titel :
Global Telecommunications Conference, 1996. GLOBECOM '96. 'Communications: The Key to Global Prosperity
Conference_Location :
London
Print_ISBN :
0-7803-3336-5
DOI :
10.1109/GLOCOM.1996.586758
