Patent ID: 7233811

Claim:
A radio apparatus having transmission directivity for performing path division multiple access with a plurality of terminal units through adaptive array signal processing, comprising: receiving means ( 2100 ) for separating a received signal from a specific one of said terminal units from a received radio signal, said receiving means including a plurality of received signal separating means ( 2110 , 2120 , 2130 , 2140 , 2210 , 2220 , 2230 , 2240 ) for multiplying said received radio signal by a reception weight vector corresponding to each said terminal unit thereby extracting said received signal, and fading rate measuring means ( 2300 ) for measuring fading rate of each of said terminal units; said radio apparatus further comprising: transmitting means ( 2400 ) for generating a transmit signal having directivity to said specific terminal unit, said transmitting means including a plurality of transmit signal generating means ( 2410 , 2420 , 2510 , 2520 ) for multiplying a transmit signal by a transmit weight vector obtained by weighting said reception weight vector for each said terminal unit in response to the fading rate from said fading rate measuring means thereby generating said transmit signal having directivity.