Iterative Achievable Rate Adaptive Beam Alignment for THz Communication Systems

Beam alignment is a key technology to ensure reliable initial access and data transmission in THz communication systems. This paper proposes an iterative achievable rate adaptive beam alignment method which iteratively searches for the optimal codebook layers of initial training and termination training based on the achievable rate criterion. Besides, in beam training at each codebook layer, the pilot sequence length of each training codeword is adaptively adjusted based on the preset detection probability as well as false alarm probability, which significantly improves the success rate of beam alignment. In order to demonstrate the superior performance of the proposed method, comparative simulations were performed. The results show that a higher success rate has been achieved in the proposed method compared with the exist methods although the pilot cost was slightly reduced, resulting in more reliable access and higher transmission rate for the systems.