Patent ID: 8406315
Filing Date: 2013-03-26
Classification: H04L

Abstract:
1. A signal transmission apparatus for use in a wireless network, the wireless network comprising a host apparatus, the signal transmission apparatus comprising: a storage, being configured to store wireless network frame information recording an arrangement of a plurality of subcarriers included in a wireless network frame, the plurality of subcarriers including a first subcarrier and a second subcarrier adjacent to the first subcarrier; a microprocessor electrically connected to the storage, being configured to generate a first reference signal and arrange the first reference signal into the first subcarrier according to the wireless network frame information, and further configured to generate a second reference signal antipodal to the first reference signal and arrange the second reference signal into the second subcarrier according to the wireless network frame information; and a transceiving interface, being configured to transmit the first reference signal and the second reference signal via the first subcarrier and the second subcarrier respectively so that the host apparatus may estimate conditions of a first communication channel between the host apparatus and the signal transmission apparatus according to the first reference signal and the second reference signal; wherein the wireless network comprises another signal transmission apparatus transmitting a third reference signal and a fourth reference signal antipodal to the third reference signal via the first subcarrier and the second subcarrier respectively, the microprocessor is further configured to generate a fifth reference signal and arrange the fifth reference signal into the first subcarrier and the second subcarrier according to the wireless network frame information, and the transceiving interface is further configured to transmit the fifth reference signal via the first subcarrier and the second subcarrier so that the host apparatus may estimate conditions of a second communication channel between the host apparatus and the another signal transmission apparatus according to the third reference signal and the fourth reference signal and further estimate conditions of the first communication channel between the host apparatus and the signal transmission apparatus according to the fifth reference signal.