On-board bidirectional communication roadside base station antenna and relay vehicle combined selection method

The invention discloses a relay vehicle and roadside base station antenna combined selection method. The problems of the conventional method such as high complexity and large calculated amount can be solved. The technical scheme provided by the invention is characterized in that own pilot signals can be transmitted to the relay vehicle by a user vehicle; the relay vehicle is used to estimate channel state information according to the received pilot signals, and the optimal relay vehicle can be selected; the optimal relay vehicle is used to transmit the own pilot and signaling symbol to a roadside base station; the roadside base station is used to estimate the channel state information between the antenna and the optimal relay vehicle according to the received pilot signal, and the antenna having the optimal channel gain can be selected; the roadside base station can be used to transmit the own pilot and signaling symbol to the selected optimal relay vehicle, and the optimal relay vehicle is used to transmit the own pilot and signaling symbol to the user vehicle. The combined selection method provided by the invention is advantageous in that the complexity degree is low, the selection efficiency is high, and the system integrated cost is small; the method is suitable for the bidirectional on-board relay network having the fast channel state change.