Mitigating clipping noise in multi-carrier systems

Author

Chow, Jacky S. ; Bingham, John A C ; Flowers, Mark S.

Author_Institution

Amati Commun., San Jose, CA., USA

Volume

2

fYear

1997

fDate

8-12 Jun 1997

Firstpage

715

Abstract

Multi-carrier signals such as are used in ADSL and VDSL have a higher peak-to-average ratio than single-carrier signals, and therefore, for a given transmit power and maximum output level of a digital-to-analog converter (DAC) the probability of the transmit signal being clipped is higher. This paper describes two methods of mitigating the effects of clipping: one that trades off clipping noise against increased quantizing noise by scaling a potentially clipped signal, and one that filters the clipping noise to reduce its spectral density at low frequencies where the SNR is expected to be higher

Keywords

circuit noise; digital communication; digital filters; digital-analogue conversion; interference suppression; spectral analysis; subscriber loops; ADSL; DAC; SNR; VDSL; clipping noise; digital-to-analog converter; filtering; multi-carrier systems; peak-to-average ratio; quantizing noise; spectral density; transmit signal; Circuit noise; Digital-analog conversion; Low-frequency noise; Noise level; Noise reduction; Noise shaping; OFDM modulation; Peak to average power ratio; Quantization; Working environment noise;

fLanguage

English

Publisher

ieee

Conference_Titel

Communications, 1997. ICC '97 Montreal, Towards the Knowledge Millennium. 1997 IEEE International Conference on

Conference_Location

Montreal, Que.

Print_ISBN

0-7803-3925-8

Type

conf

DOI

10.1109/ICC.1997.609945

Filename

609945