Title :
Optimum frequency-domain partial response encoding in OFDM system
Author :
Zhang, Hua ; Li, Ye
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
Time-variance of wireless channels destroys the orthogonality among subchannels in OFDM system and causes the inter-channel interference (ICI), which results in an error floor. In this paper, we study frequency-domain partial response coding (PRC) for reducing the effect of the ICI. Based on the general expression of the ICI power for OFDM with PRC, the optimum weights for PRC that minimize the ICI power are derived. From numerical and simulation results, optimum PRC for OFDM can reduce the ICI effectively by 4.0 dB for 2-tap PRC and 6.2 dB for 3-tap PRC, respectively.
Keywords :
OFDM modulation; adjacent channel interference; frequency-domain analysis; interference suppression; minimisation; partial response channels; Doppler frequency shift; OFDM system; carrier frequency offset; frequency-domain partial response encoding; interchannel interference; orthogonal frequency division multiplexing; power minimization; Bandwidth; Detectors; Digital video broadcasting; Encoding; Interchannel interference; Numerical simulation; OFDM modulation; Partial response channels; Time domain analysis; Transmitters;
Conference_Titel :
Communications, 2003. ICC '03. IEEE International Conference on
Print_ISBN :
0-7803-7802-4
DOI :
10.1109/ICC.2003.1203958
