Patent ID: 7804857
Filing Date: 2010-09-28
Classification: H04B,H04L

Abstract:
1. A transceiver having internal impedance and communicating with a first device through a transmission line, and the first device communicating with a second device through the transmission line, the transceiver comprising: an impedance controller that sets the internal impedance at either a first impedance or a second impedance, the second impedance being higher than the first impedance, and a receiver that receives a frame including a preamble, a first signal, a reference and a second signal, the frame being transmitted from the first device, the first signal including a destination regarding the second signal, and a channel estimation unit that performs a channel estimation with the first device, wherein the receiver receives the first signal while the internal impedance is being set at the first impedance by said impedance controller, said channel estimation unit performing the channel estimation based on said preamble, wherein said impedance controller changes the internal impedance from the first impedance into the second impedance in case that the first signal indicates the second device as the destination, and wherein, in case that the first signal indicates the transceiver as the destination, said impedance controller keeps the internal impedance at the first impedance and said channel estimation unit performs a channel estimation with the first device based on the reference before the second signal is demodulated.