Subcarrier Block Power Control for Adaptive Downlink OFDM with Frequency Spreading and Equalization

Nam-Su KIM  Sungho CHO  Chang-Jun AHN  

IEICE TRANSACTIONS on Communications   Vol.E89-B   No.7   pp.2102-2105
Publication Date: 2006/07/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.7.2102
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
subcarrier block power control,  frequency symbol spreading,  MMSEC,  

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In this letter, we propose the transmit power controlled adaptive downlink frequency symbol spreading OFDM (TPC-AMS/FSS-OFDM) system. In the TPC-AMS/FSS-OFDM, each S/P transformed signal is spread by orthogonal spreading codes and combined in the transmitter, so the detected signals obtain the same SINR for each frequency symbol spreading block in the receiver. In this case, we can assign the same modulation level and transmit power for each frequency symbol spreading block for next transmission. Thus, the proposed system not only increases throughput performance but also reduces the total transmit power, FBI and MLI.