Joint Design of MIMO-OFDM and MIMO-CDMA Transceivers
|關鍵字:||多輸入多輸出;正交分頻多工;分碼多重進接;通道估測;同步;訓練序列;MIMO;OFDM;CDMA;channel estimation;synchronization;training sequence|
The development of wireless communication systems for high data rate transmission between terminals has become one of the new challenging subjects in the telecommunication research area. Multiple input multiple output (MIMO) techniques can create independent parallel channels in spatial domain for sending multiple data streams, thereby increasing the overall transmission rate of the system. Techniques of spatial multiplexing offered by MIMO can effectively enhance the spectral efficiency without the need of extra frequency resources. On the other hand, orthogonal frequency division multiplexing (OFDM) and code division multiple access (CDMA) are two popular transmission techniques in wireless communication. In this thesis, we investigate the joint design of OFDM and CDMA transceivers under the MIMO system architecture. The joint design is developed based on the idea of viewing OFDM subcarriers as a counterpart of CDMA spreading codes. Channel estimation and synchronization schemes for the jointly designed transceiver are also investigated in this thesis. In particular, we propose a frequency offset estimation scheme with a wider range of estimation and a channel estimation scheme with lower computational complexity. By the concept of software defined radio, multimode transmission can be carried out on the jointly designed transceiver architecture. Finally, the jointly designed transceiver is verified to possess good performance in wireless communication environments by computer simulations.
|Appears in Collections:||Thesis|