Patent ID: 8605776
Filing Date: 2013-12-10
Classification: G06K,H04B,H04L

Abstract:
1. A proximity contactless communication apparatus which is a first communication apparatus of a proximity contactless communication system for baseband communication between the first communication apparatus and a second communication apparatus, the second communication apparatus comprising at least one transmitting antenna and at least one receiving antenna, the proximity contactless communication apparatus comprising: at least one transmitting antenna disposed close to the receiving antenna of the second communication apparatus; at least one receiving antenna disposed close to the transmitting antenna of the second communication apparatus; an encoder circuit configured to use a plurality of encoding methods requiring different bandwidths for transmission, respectively; a decoder circuit configured to use a plurality of decoding methods corresponding to the plurality of encoding methods; a test pattern generator circuit configured to generate test patterns; a comparator circuit configured to compare two test patterns; and a control circuit configured to perform a process for establishing communication between the proximity contactless communication apparatus and the second communication apparatus, wherein the test patterns are generated to include a plurality of different frequency components when the test patterns are transmitted between the proximity contactless communication apparatus and the second communication apparatus, the plurality of different frequency components corresponding to the plurality of different bandwidths required by the plurality of encoding methods, and wherein in the process for establishing communication between the proximity contactless communication apparatus and the second communication apparatus, the control circuit is configured to: compare, by the comparator circuit, a test pattern generated by the test pattern generator circuit, with a test pattern transmitted to the second communication apparatus through the transmitting antenna of the proximity contactless communication apparatus and returned from the second communication apparatus through the receiving antenna of the proximity contactless communication apparatus; determine a bandwidth corresponding to frequency components correctly transmitted between the proximity contactless communication apparatus and the second communication apparatus, based on the returned test pattern, and select an encoding method requiring a maximum available bandwidth; generate a notification message indicating the selected encoding method, and encode the notification message by the encoder circuit using the selected encoding method, and transmit the encoded notification message to the second communication apparatus through the transmitting antenna of the proximity contactless communication apparatus; and establish communication between the proximity contactless communication apparatus and the second communication apparatus, when receiving a response message including an acknowledgement to the notification message, from the second communication apparatus, through the receiving antenna of the proximity contactless communication apparatus.