  Compared with image method (IM) based ray tracing (RT), shooting and bouncing
ray (SBR) method is characterized by fast speed but low accuracy. In this
paper, an iterative precise algorithm based on equiangular division is proposed
to make rough paths accurate, allowing SBR to calculate exact channel
information. Different ray launching methods are compared to obtain a better
launching method. By using equiangular division, rays are launched more
uniformly from transmitter (Tx) compared with the current equidistant division
method. With the proposed iterative precise algorithm, error of angle of
departure (AOD) and angle of arrival (AOA) is below 0.01 degree. The
relationship between the number of iterations and error reduction is also
given. It is illustrated that the proposed method has the same accuracy as IM
by comparing the power delay profile (PDP) and angle distribution of paths.
This can solve the problem of low accuracy brougth by SBR.
