OFDM在高速移動下的載波間干擾消除

針對正交頻分復(fù)用系統(tǒng)的信道時變會破壞載波間的正交性而導(dǎo)致載波間干擾，提出了一種分段均衡有效的載波間干擾消除方法，其優(yōu)點是：當(dāng)采用兩段和四段均衡時，在M1225信道模型下，可分別提高接收信噪比6 dB和12 dB，且與標準的均衡方法具有相同的頻譜效率。性能分析與仿真驗證表明，分段均衡方法能有效地消除頻率偏移與信道時變而產(chǎn)生的載波間干擾。
關(guān) 鍵 詞 正交頻分復(fù)用; 時變信道; 載波間干擾; 分段均衡

Abstract For orthogonal frequency-division multiplexing (OFDM) communication systems, a loss of subcarrier orthogonality due to time-variant multipath channel leads to intercarrier interference (ICI).This paper studies an efficient ICI cancellation method termed segment equalization schemes.The signal-to-interference power rate can be increase 6 dB and 12 dB when the segment size is two or four, and the system has the same spectrum efficiency with standard equalization. Simulations and performance analysis show that OFDM system using the proposed segment equalization can effectively reduce the ICI cause by frequency offset and large doppler frequency shifts in mobile radio channels.
Key words orthogonal frequency-division multiplexing; time-vary channel; intercarrier interference; segment equalization