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This paper presents a novel SSS detection method for the second step of neighbor cell search in 3GPP LTE TDD systems. The proposed method is based on coherent detection and contains two stages. At the first stage, SSS is detected by using estimated channel response at PSCH. Owing to the difference of channels between PSCH and SSCH in TDD mode, the channel response estimated from PSCH does not exactly match the channel response of SSCH and performance degradation is occurred. To mitigate the effect of such channel mismatch problems and improve the cell search reliability, the candidate cells selected at the first stage will be further confirmed by a second coherent detection with channel response estimated from SSCH at the second stage.
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