Abstract:

A kind of GCL(Generalized chirp-like) sequences are adopted as the preambles of the random access channel(RACH), and a cyclic postfix is added. This structure can utilize the perfect periodic correlation properties of GCL sequences effectively to improve the detection performance. Furthermore, a kind of detection algorithm is proposed, which is based on the peak-average ratio detection within a window. Threshold is designed based on the proposed algorithm, and both false alarming probability and missing detection probability are analyzed. The possibility to adapt the proposed algorithm to be used as collision detection algorithm and channel estimation algorithm is also analyzed. Analysis and simulation results show that the proposed preamble structure and the corresponding detection algorithms have good performance.

Key words: random access channel, preamble, zero correlation zone sequences, false alarm, missing detection