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Coexistence and interoperability between 20 MHz and 40 MHz device and modes of op-erations are stressed in standard IEEE 802.11n system.It is mandate to report the both sub-channels states to Medium Access Control(MAC) at receiver,since for 40 MHz device,it should serve not only 20 MHz but also 40 MHz signals receiving.Both energy detection and carrier sense are employed to detect channel state.In the case of 20/40 M mode,the power difference between the two sub-channels is also detected in order to report the channel state accurately.The simulation results demonstrate that the performance of the proposed methods are much better than the methods which just employ energy detection.Besides,the simulation results show that the proposed methods ensure that the channel sensing is not a roadblock of IEEE 802.11n system design.
Coexistence and interoperability between 20 MHz and 40 MHz device and modes of op-erations are stressed in standard IEEE 802.11n system. It is mandated to report the both sub-channels states to Medium Access Control (MAC) at receiver, since for 40 MHz device, it should serve not only 20 MHz but also 40 MHz signals receiving. But energy detection and carrier sense are employed to detect channel state. In the case of 20/40 M mode, the power difference between the two sub-channels is also detected in order to report the channel state accurately. the simulation results demonstrate that the performance of the proposed methods are much better than the methods which just employ energy detection. Besides, the simulation results show that the proposed methods ensure that the channel sensing is not a roadblock of IEEE 802.11n system design.