For example , carrier frequency offsets , which are caused by the inherent instabilities of the transmitter and receiver carrier frequency oscillators , can lead to severe system degradation due to inter - carrier interference ( ici ) . symbol timing synchronization must also be achieved in order to avoid inter - symbol interference ( isi ) 其載波頻率誤差會(huì)引入子信道之間的干擾( ici ) ,而幀同步的誤差會(huì)引入符號(hào)間干擾( isi ) ,同時(shí)還會(huì)對(duì)信道估計(jì)帶來(lái)嚴(yán)重的影響。
Based on analyzing the water resource situation and water environment problems such as water pollution , ground water table dropping , seawater invading and local water system degradation in shandong peninsula urban agglomeration ( spua ) , this article puts forward some strategies for sustainable water utilization in spua accompanying the rapid urbanization 摘要在分析山東半島城市群水資源狀況和地下水位下降、海水入侵、水域污染及自然生態(tài)失衡等水環(huán)境問(wèn)題的基礎(chǔ)上,提出了水資源約束下山東半島城市群發(fā)展對(duì)策。