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In broadband DS-CDMA using Frequency-Domain Equalization (FDE) without Cyclic Prefix (CP) insertion, the transmission performance degrades due to Inter Block Interference (IBI) and circular property loss. In the authors' previous study, they introduced the perfect IBI cancellation and circular property restoration to mitigate the problems arising from IBI and circular property loss. The perfect channel estimation was assumed. In this paper, assuming the Gaussian error model, they investigate the impact of channel estimating error on the Bit Error Rate (BER). The requirement for practical channel estimation is also given based on the result.
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