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| Hybrid link adaptive algorithms for wpan/wlan applications |
| Qian Xiaoyong; Shen Lianfeng; Hu Jing; Xu Guojun; Xu Pingping |
| National Mobile Comm. Research Laboratory Southeast Univ., Nanjing 210096 China |
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Abstract In this paper, the characteristics of two link adaptive algorithms based on Carrier to Interference ratio (C/I) and Packet Error Rate (PER) are discussed. Furthermore, two hybrid algorithms of link adaptation are proposed on the analysis of the existing algorithms. One is named integrated hybrid method, in which PER and C/I are taken as the estimates of channel quality simultaneously. The other that selectively considers C/I or PER as the estimates of channel quality at a time is called selective hybrid method. Simulation results indicate that the integrated hybrid method can achieve the maximum throughputs at an ideal uni-user scenario. While at a multi-user scenario, a few received packets of one user lead to the large variance of PER values, which results in throughput loss. Therefore, at the scenario above, selective hybrid method is superior to other methods in term of network throughputs.
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Received: 05 November 2001
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2003, Vol. 25 
