Abstract:

In order to improve the system capacity and simplify the receiver structure of traditional multi-carrier scenarios, a new orthogonal code called orthogonal time-frequency code was produced. Thereafter, a multi-carrier code division multiple access scheme was proposed. This new scheme employs orthogonal time-frequency code as its address code. It can not only improve the utilization of the codeword, but also can enhance the capacity of system. The frequency diversity gain in frequency selective fading channel can be obtained without coding by employed the Rake receive, that can also complete channel estimation and carrier recovery simultaneously. Simulation is coincided with the analysis.

Key words: orthogonal time-frequency code, channel estimation, carrier recovery, Rake receive