Novel Pilot-Free Adaptive Modulation for Wireless OFDM Systems

Huang, Xiaozhou; Wu, Hsiao-Chun; Wu, Yiyan

doi:10.1109/tvt.2008.919926

Cited by 29 publications

(1 citation statement)

References 15 publications

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“…In OFDMA systems, due to the existence of the multiple paths which have different time delays and attenuations, different sub-carriers would be impaired differently. According to the timedispersive multi-path characteristic of OFDM channels, adaptive modulation methods adopted different modulation mode on each sub-carrier [11,12]. The channel adaptation methods have been proved to be bandwidth efficient and can enhance system throughput.…”

Section: Introductionmentioning

confidence: 99%

A Combined Fair Resource Scheduling and Adaptive Modulation Scheme for Clustered OFDMA Systems

Huang

Chen

2012

AMM

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Orthogonal frequency division multiple access (OFDMA) is a promising technique for achieving high downlink capacities in next generation wireless communication system. An OFDM system has the advantage that multiple users can be scheduled at the same time in a frequency-selective channel. Proportional fair resource scheduling algorithm can guarantee the fairness among multiple users. Compared to the conventional fixed modulation, link adaptation modulation can select the most appropriate modulation scheme on each sub-carrier according to the current link qualify, this can be used to enhance system throughput. However, the overhead cost of feeding back channel state and modulation mode information of every sub-carrier for every user is very high. Cluster feedback scheme can greatly reduce the feedback overhead. In this paper, based on cluster feedback, an adaptive modulation with proportional fair scheduling algorithm is proposed. The analysis and simulation result verify that the introduced scheme is effective in improving system throughput and has fairness among users.

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Section: Introductionmentioning

confidence: 99%