DocumentCode :
1086177
Title :
Design of multiple MMSE subequalizers for faster-than-Nyquist-rate transmission
Author :
Lee, Jae-Hyok ; Lee, Yong-Hwan
Author_Institution :
Telecommun. Syst. Div., Samsung Electr. Co. Ltd., Gyeonggi-Do, South Korea
Volume :
52
Issue :
8
fYear :
2004
Firstpage :
1257
Lastpage :
1264
Abstract :
We consider an equalization problem when the transmitted symbol rate is higher than the available channel bandwidth. This situation can happen in the uplink of the voiceband pulse-code modulation (PCM) modems whose transmit signal bandwidth is larger than the available channel bandwidth. Although the use of a minimum mean-squared error (MMSE) pre-equalizer is considered in the International Telecommunications Union (ITU)-T V.92 Recommendation, it may not provide an acceptable performance unless the channel condition is mild. As another approach to this problem, we consider the use of a bank of subequalizers, each of which compensates the part of the channel distortion, enabling the PCM-mode transmission over the channel where the V.92 scheme may fail. In this paper, a multiple subequalizer scheme is optimally designed in the MMSE sense, and its performance is compared with the MMSE pre-equalizer of V.92 in terms of the bit-rate-normalized signal-to-noise ratio.
Keywords :
equalisers; least mean squares methods; modems; pulse code modulation; telecommunication channels; ITU-T V.90 recommendation; PCM-mode transmission; bit-rate-normalized signal-to-noise ratio; channel bandwidth; channel conditions; channel distortion; equalization problem; faster-than-Nyquist-rate transmission; minimum mean-square error; multiple MMSE subequalizers; transmission symbol rate; transmit signal bandwidth; voiceband pulse-code modulation modems; Bandwidth; Codecs; Downlink; Finite impulse response filter; IIR filters; Modems; Phase change materials; Pulse modulation; Quantization; Signal design; Equalizer; MMSE; faster-than-Nyquist signaling; minimum mean-squared error;
fLanguage :
English
Journal_Title :
Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
0090-6778
Type :
jour
DOI :
10.1109/TCOMM.2004.833009
Filename :
1327840
Link To Document :
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