The Analysis and Hardware Design of M-Modification MC-CDMA System Using the THP Technique

• Main Authors: Ching-Fen Wu, 吳靜芬
• Other Authors: 張振豪
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/18191086907877407424

碩士 === 國立中興大學 === 電機工程學系所 === 94 === MC-CDMA system, which combines the advantages of the high data rate of OFDM and the multiple access of CDMA, is one of the most important methods in the downlink system of the next generation communication system. The receiver can use the channel equalizer to compensate the channel effect in the frequency domain. The single user detection methods include: maximum ratio combining, equal gain combining, zero forcing combining, and minimum mean square error combining. In which, the minimum mean square error combining can obtain a better performance, but requires a larger hardware cost in the receiver. The hardware implementation of the other single user detection methods is easier, but can’t eliminate the interference of the MAI or avoid the noise enhancement effectively so that the performance is not as good as MMSE. This thesis assumes that the transmitter has the channel state information in the MC-CDMA system. We use the Tomlinson- Harashima Precoding technique based on the ZF criterion or the MMSE criterion to avoid the transmit power enhancement and get a much better performance with a lower hardware complexity for the detection unit in the receiver. We use Matlab to simulate the performance using ZF or MMSE criterion Tomlinson-Harashima precoding technique and design the hardware of the transmitter. Finally, Verilog HDL is used to design the hardware through the cell-based IC physical design flow and UMC 0.18um 1p6m technology to get the layout of the circuit.