Title :
A Two-Dimension Opportunistic CSMA/CA Protocol for OFDMA-Based In-Home PLC Networks
Author :
Dong, Rongping ; Ouzzif, Meryem ; Saoudi, Samir
Author_Institution :
Orange Labs., Lannion, France
Abstract :
Multichannel systems can benefit from multiuser diversity by assigning channels to users with best channel conditions in different time instants. In this paper, a two-dimension opportunistic scheme for OFDMA-based in-home PLC systems with random access is presented in order to exploit multiuser diversity over different subchannels and time diversity across different time slots. The proposed scheme adjusts the backoff time for each user based on the knowledge of instantaneous channel information in both frequency and time domains, and thus assigns users with better channel quality higher priority to channel accessing. Moreover, users are scheduled to transmit over their favorable subchannels in order to further improve the system throughput. The analysis shows that the collision probability of the proposed scheme is extremely small. Additionally, simulation results demonstrate that the saturated throughput is significantly augmented even in the case that the number of users is highly exceeds that of subchannels.
Keywords :
OFDM modulation; carrier sense multiple access; carrier transmission on power lines; home computing; probability; protocols; telecommunication congestion control; time-frequency analysis; OFDMA-based In-home PLC network; channel quality; collision probability; collision sense multiple access-collision avoidance; frequency domain analysis; instantaneous channel information knowledge; multichannel system; multiuser diversity; orthogonal frequency division multiplexing; power line communication; random access; subchannel; time domain analysis; two-dimension opportunistic CSMA-CA protocol; Frequency domain analysis; Multiaccess communication; Noise; OFDM; Protocols; Radiation detectors; Throughput;
Conference_Titel :
Communications (ICC), 2011 IEEE International Conference on
Conference_Location :
Kyoto
Print_ISBN :
978-1-61284-232-5
Electronic_ISBN :
1550-3607
DOI :
10.1109/icc.2011.5962436