Title :
A delay profile information based subcarrier power control combined with a partial non-power allocation technique for OFDM/FDD systems
Author :
Maeda, Noriyuki ; Sampei, Seiichi ; Morinaga, Norihiko
Author_Institution :
Graduate Sch. of Eng., Osaka Univ., Japan
Abstract :
This paper proposes a delay profile information based subcarrier power control combined with a partial non-power allocation technique for OFDM/FDD systems to achieve high bit-rate and high quality non-voice data transmission for wireless communication systems. To improve the bit error rate (BER) performances for the convolutionally encoded OFDM system, the proposed system controls the transmit power for each subcarrier in order to keep the received power of each subcarrier constant using a measured delay profile and noise level given by a delay profile information (DPI) channel in the return-link. To further reduce the transmit power needed to achieve high quality data transmission, a partial non-power allocation (PNPA) scheme combined with a punctured coding technique is further applied to the subcarrier power control. In this scheme, the deleted bits by the punctured coding are allocated to the nonreliable subcarriers and transmit power for these subcarriers are power-suppressed. Computer simulation confirms that the proposed system can achieve high quality data transmission and reduction of transmit power as compared with that of a conventional system in frequency selective fading environments
Keywords :
OFDM modulation; convolutional codes; data communication; delays; error statistics; fading channels; land mobile radio; modulation coding; power control; radio links; telecommunication control; BER performance; OFDM/FDD systems; bit error rate; computer simulation; convolutionally encoded OFDM system; delay profile information channel; frequency selective fading; high bit-rate; high quality data transmission; measured delay profile; noise level; nonreliable subcarriers; partial nonpower allocation; punctured coding; received power; return-link; subcarrier power control; transmit power control; wireless communication systems; Bit error rate; Communication system control; Control systems; Convolutional codes; Data communication; Delay; OFDM; Performance evaluation; Power control; Wireless communication;
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2000. PIMRC 2000. The 11th IEEE International Symposium on
Conference_Location :
London
Print_ISBN :
0-7803-6463-5
DOI :
10.1109/PIMRC.2000.881644