Multi-rate transmission in orthogonal code hopping multiplexing

Collision-based hopping multiplexing was previously proposed with names of orthogonal code hopping multiplexing (OCHM) and orthogonal frequency hopping multiplexmig (OFHM). A major performance measure of these schemes is collision probability, which is closely related to block error rate performance in receiver. In this paper, we analyze the code-collision probability of OCHM in a multi-rate transmission environment, while all previous works assumed a single-rate transmission in which all downlink channels have the same data rate. For verification, we perform multi-user simulations in a transmitter, and compare the analytical results with simulation ones.