| 1. | The main difficulty to achieve high data rate is the intersymbol interference ( isi )
而码间干扰是高速通信面临的主要困难。 |
| 2. | Equalization technology is a effective method which can remove intersymbol interference ( isi ) in digital communication
均衡技术是数字通信系统中克服码间干扰的有效方法，目前得到了广泛应用。 |
| 3. | In digital communication systems , intersymbol interference ( isi ) is often encountered when unknown signals are transmitted through nonidea channels
数字通信系统中，信号在传输过程中不可避免会产生码间串扰。 |
| 4. | Finally , a new approach combining equalization and adaptive equalization with ldpc decoding are proposed to combat the intersymbol interference ( isi ) and channel noise
最后,针对噪声干扰和码间串扰问题,研究了ldpc码组合均衡技术以及组合自适应均衡技术。 |
| 5. | But when the bit rate is above 1 mbps , the signal suffers frequency select fading , which causes the serious intersymbol interference ( isi ) . increasing the system power can ’ t reduce the ber
但是当码速率提高到1mbps以上时,信号受到频率选择性衰落,码间干扰严重,增大系统功率也不能降低系统误码率。 |
| 6. | Frequency - selective fading due to multipath propagation is a big obstacle in wireless communication . in the condition , the intersymbol interference ( isi ) comes into being and communication system appears error received symbol
多径传输效应引起的频率选择性衰落是无线通信的一大障碍,使接收信号产生码间干扰( isi ) ,导致通信系统出现误码。 |
| 7. | By using ofdm technology , we can redu ce the baud rate with a high frequency spectrum utility factor . another advantage of this technology is that the transmission can combat the intersymbol interference ( isi ) at the receiver without complex adaptive equalizer
Ofdm既有较高的频谱利用率，也有效地降低了码速率，在不使用复杂的信道均衡技术的条件下仍然可以较好地克服接收时由多径效应带来的码间串扰( isi ) 。 |
| 8. | When the high rate data is transmitted through bandlimited channels in mobile communications , the intersymbol interference ( isi ) caused by channel distortion and multipath propagation will bring decoding error . it needs to adopt appropriate techniques to remove or reduce this kind of interference
当在带限信道上传输高速数据时，会因为信道畸变和多径效应产生的码间干扰而产生误码，这就需要采用适当的技术来消除或减少这种干扰。 |
| 9. | In mobile communication and high - speed wireless digital communication , multi - path , the finity of channel bandwidth and faultiness of the channel , lead to the bringing of intersymbol interference ( isi ) when data transfer . this is an important factor that degrades the performance of communication . however channel equalization technique can eliminate the isi and noise , it can also reduces the bit error ratio
在移动通信及高速无线数据通信中，多径效应和信道带宽的有限性以及信道特性的不完善性导致数据传输时不可避免地产生码间干扰( isi ) ，成为影响通信质量的重要因素，而信道的均衡技术可以消除码间干扰和噪声，并减少误码率。 |
