Implementation of channel estimation for MIMO-OFDM systems

In modern Wireless Local Area Network (WLAN), both the transmitting data throughput and the connecting stability are very important. For the IEEE802.11n protocol specification, it is made of a multi-input multi-output (MIMO) system and an Orthogonal Frequency Division Multiplexing (OFDM) system. In order to decrease the decoding error rate at the receiving end and to fully restore the original transmitting signal, estimation of the channel response information is necessary. In this paper, a combined channel estimation algorithm is proposed by using TDT-L-STBC, which can increase the MIMO channel estimation performance. The proposed architecture of MIMO-2×2 is implemented and verified by TSMC 0.18 μm CMOS technology.