Title :
Orthogonal frequency division multiple access with an aggregated sub-channel structure and statistical channel quality measurement
Author :
Yoon, Seokhyun ; Suh, Changho ; Cho, Youngkwon ; Park, D.S.
Author_Institution :
Telecommun. R&D Center, Samsung Electron., Co. Ltd, Suwon, South Korea
Abstract :
In this paper, an orthogonal frequency division multiple access (OFDMA) is considered for the mobile air interface. To reduce the reverse link overheads for CQI feedback, we consider an aggregated sub-channel structure, where a set of adjacent sub-carriers are tied up to a sub-channel to be used as a unit of user-multiplexing and the corresponding power/rate allocation. Modeling the SNR distribution over the bandwidth of a sub-channel as Rician, the channel quality of a sub-channel is summarized with the mean and variance of channel gain envelop divided by noise standard deviation. Then, we develop a generalized two step channel/resource allocation algorithm, which uses the two statistical measurements, and analyze the spectral efficiency of the OFDMA system in terms of average frequency utilization.
Keywords :
OFDM modulation; Rician channels; bandwidth allocation; channel allocation; frequency division multiple access; quality of service; statistical analysis; subcarrier multiplexing; CQI feedback; OFDMA; Rician channel; SNR distribution; adjacent sub-carriers; aggregated sub-channel structure; average frequency utilization; channel gain envelop; channel/resource allocation; generalized two step algorithm; mobile air interface; noise standard deviation; orthogonal frequency division multiple access; power/rate allocation; reverse link overheads; spectral efficiency; statistical channel quality measurement; user-multiplexing; Algorithm design and analysis; Bandwidth; Feedback; Frequency conversion; Frequency measurement; Radio spectrum management; Resource management; Rician channels; Signal to noise ratio; Spectral analysis;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th
Print_ISBN :
0-7803-8521-7
DOI :
10.1109/VETECF.2004.1400176