Title :
A time-domain equalizer minimizing intersymbol and intercarrier interference in DMT systems
Author :
Baldemair, Robert ; Frenger, Pål
Author_Institution :
Ericsson, Stockholm, Sweden
Abstract :
Discrete multitone modulation allows for a simple receiver structure if the impulse response of the communication channel is shorter than the cyclic prefix. In ADSL, a time-domain equalizer (TEQ) is used to fulfil this requirement. Without a TEQ, unwanted intercarrier interference (ICI) and intersymbol interference (ISI) occur. In this paper, quadratic forms are developed to calculate the contributions of ICI and ISI to the desired signal. Based on these expressions, a new method for calculating the TEQ coefficients, which minimizes the effects of ICI, ISI, and additive noise, is derived. Simulations in the context of ADSL compare the performance of this new algorithm with one that is state of the art
Keywords :
digital subscriber lines; equalisers; interference suppression; intersymbol interference; modulation; noise; time-domain analysis; transient response; ADSL; DMT systems; ICI; ISI; TEQ coefficients; additive noise; cyclic prefix; discrete multitone modulation; impulse response; intercarrier interference; intercarrier interference minimisation; intersymbol interference; intersymbol interference minimisation; simulations; time-domain equalizer; Additive noise; Communication channels; Context; Convolution; Demodulation; Discrete Fourier transforms; Equalizers; Intersymbol interference; OFDM modulation; Time domain analysis;
Conference_Titel :
Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-7206-9
DOI :
10.1109/GLOCOM.2001.965143
