| 1. | Spectral efficiency of adaptive transmission in urban microcellular networks
城市微蜂窝网络中自适应传输的频谱效率 |
| 2. | 8psk has the potential to increase the data rate of existing gsm systems by a factor of three
与原有的gmsk调制方式相比， 8psk不但可以提高数据率，而且可以获得较高的频谱效率。 |
| 3. | But the spectrum efficiency of the traditional ofdm system is limited due to variance of channel parameters such as channel response and rms delay spread
但是，决定通信系统调制参数的信道响应和rms时延扩展由于物体的运动或者环境的变化而动态变化，传统的静态确定ofdm系统调制参数的方法的频谱效率不够高。 |
| 4. | Mimo - ofdm has been regarded as the key technology of b3g communication system because it can improve system capacity and spectrum efficiency . however , ofdm is very sensitive to frequency offset
由于能够显著改善频谱效率、提高数据传输速率和系统容量, mimo - ofdm技术被广泛认为是后三代移动通信系统( b3g )的关键技术。 |
| 5. | In this thesis , we compared the two acm through simulation , and analyzed their merits and flaws . then we present an optimal design scheme of average spectral efficiency in adaptive coded modulation system
本文对上述两种自适应编码调制策略做了比较,分析了各自的优缺点,并提出了一种基于平均频谱效率的自适应编码调制的优化方案。 |
| 6. | The simulation results of wcdma uplink is presented and analyzed . it shows that the combined power and rate control scheme achieve good spectrum efficiency and keep the data rate constant over long time periods
仿真结果显示我们提出的基于sir平衡的功率速率联合控制方案使系统有很好的频谱效率并在长时间保持数据速率为一个恒定值。 |
| 7. | Following the principle of reuse partitioning , two new frequency planning schemes are proposed , the coverage - oriented scheme and the efficiency - oriented scheme , for the cellular system with two - hop fixed relay nodes ( frns )
摘要根据复用分割原则，提出2种新的两跳固定中继蜂窝网的频谱分配方案，即：侧重于覆盖面积的频谱分配方案和侧重于频谱效率的频谱分配方案。 |
| 8. | The basic framework of the corresponding transmittersand receivers for stfs are showed , and several combination quomodos for stfs arepresented . at last , the frequencyspectrum efficiencyand error probability of stfs areanalysed , and thevalidityofstfsisprovedbysimulation
最后对空时频扩频码的频谱效率和成对错误概率进行了分析,对空时频扩频码的有效性进行了仿真证明。 |
| 9. | To increase the spectrum efficiency of the ofdm system , a novel aofdm ( adaptive ofdm ) system , which can change its modulation type and length of guard interval according to the estimated channel information , is designed
为了提高ofdm的频谱效率，我们设计了一个能根据信道特征动态改变其调制方式以及保护间隔的自适应ofdm ( aofdm ， adaptiveorthogonalfrequencydivisionmultiplexing )系统。 |
| 10. | Multiple - input multiple - output ( mimo ) technique , offers an effective way to combat and even exploit fading . another technique , orthogonal frequency division multiplexing ( ofdm ) , proposed in 1960s , now has gained much attention with its ability to reduce system complexity
而60年代提出的正交频分复用( ofdm )技术,由于能够显著简化系统接收机的设计并具有优越的频谱效率,近十多年来也获得了极大的关注。 |
