This paper presents the algorithm model, performance analysis and simulation results of coherent reception for the two types of transmit diversity technologies, open-loop and closed-loop, in WCDMA systems, and further reveals the relationship between the two types of transmit diversity technologies. Theoretical analysis and simulation results show that under the condition of the same total transmitted bit energy, the closed-loop transmit diversity mode can provide better reception performance than the open-loop diversity mode in a pedestrian environment; the reception performance of the open-loop diversity mode has better stability than the closed-loop mode in a vehicle-mounted environment.
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