频谱效率

TD-SCDMA系统的频谱效率分析

Analysis of Spectrum Efficiency in TD-SCDMA System

从目前技术发展来看，MIMO是增加无线通信系统频谱效率非常有效的一种方法。

From the current technology development , MIMO wireless communication system is an effective method to increase the spectrum efficiency .

一种提高低信噪比OFDM系统频谱效率的资源分配算法

Resource allocation algorithm to improve frequency efficiency of low SNR OFDM systems

基于OFDM分组传输系统的频谱效率分析与比较

Spectral Efficiency Analysis and Comparison of OFDM Based Transmission System

多入多出（MIMO）技术是无线通信技术发展的一次重大飞跃，它能够突破无线频率资源限制，大幅度地提高无线通信系统的频谱效率，被公认为是无线通信技术的未来发展趋势。

Multiple-input multiple-output ( MIMO ) technology is a significant breakthrough in the development of wireless communication technologies .

多输入多输出（MIMO）技术通过空间复用能提高无线频谱效率，通过空间分集能提高链路可靠性。

Multiple-Input-Multiple-Output ( MIMO ) offers spatial multiplexing gain which increases spectral efficiency , and diversity gain which improves link reliability .

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。

It shows that the combined power and rate control scheme achieve good spectrum efficiency and keep the data rate constant over long time periods .

FDMA，TDMA与CDMA蜂窝系统频谱效率的比较

A Comparison of the Spectral Efficiency Between FDMA , TDMA and CDMA Cellular Systems

MIMO中继技术结合了多天线系统和中继技术的优点，进一步提高了中继系统的频谱效率。

MIMO relay chan-nels , which combines the multiple antenna system and the relay , can improve the spectral efficiency of relay network .

MIMO技术充分利用空间资源，使用多个天线来提高系统容量的技术，系统具有较大的频谱效率开发潜力。

Employing multiple antennas at transmitter and receiver , MIMO technology has enormous potential to increase system capacity and thus improve spectral efficiency .

PSAM自适应调制OFDM的频谱效率

Spectral Efficiency of Adaptive Modulation OFDM Using PSAM

在高干扰情况下，以最大化频谱效率为目标的联合路由和链路调度优化问题是NP-hard问题。

It is NP-hard to jointly optimize routing and scheduling to maximize the efficiency of spectrum .

基于MIMO技术的时空编码技术是未来宽带无线移动通信中提高频谱效率改善系统性能的关键技术。

MIMO-based Space-Time coding techniques are the key technology for the future wireless mobile communications to increase frequency efficiency and improve performance of systems .

OFDM（OrthogonalFrequencydivisionMultiplexing）技术由于具有频谱效率高和抗频率选择性衰落强等优点，已经成为未来无线通信的关键技术。

Due to its high spectral efficiency and robustness against frequency selective fading , Orthogonal Frequency Division Multiplexing ( OFDM ) has become a key technique in future wireless communication .

传统的CDMA技术存在严重的多址干扰现象，使得信道的频谱效率不能达到最佳状态。

The traditional CDMA technology has serious multi address interference phenomenon , so the frequency spectrum efficiency of the channel can ′ t reach the optimal state .

多输入多输（MIMO）技术已被证明能在不增加带宽和发射功率的情况下，能有效提高系统的频谱效率和差错性能。

Multiple-input multiple-output ( MIMO ) technology has been shown to effectively improve the system spectral efficiency and error performance without increasing the bandwidth and transmit power .

LTE以其实现简单、频谱效率高、抗多径衰落等多项优势赢得了各大运营商的关注。

LTE gets many operators ' attention cause its characteristics of simple , high efficiency , anti-fading , and so on .

在与DVB-C同等部署条件下，C2系统的频谱效率可以提高30%。

Under the same configuration with DVB-C system , C2 system improves the utilization rate of frequency spectrum .

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。

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 .

未来无线通信系统需要在保证业务服务质量（QoS）的同时，在有限的频带内提供更高的数据速率和频谱效率。

Future wireless communication systems face the great challenges of providing higher data rates and spectral efficiency with the limited frequency bandwidth , while guaranteeing quality of service ( QoS ) .

然后分析了在DF协作中应用自适应调制的协作方法的性能，可以提高协作系统的频谱效率。

Then we analyzed the application of adaptive modulation in DF , which can further enhance the spectral efficiency of cooperative diversity system .

另一方面，对于MIMO-OFDM系统来说，自适应调制技术可以提高系统的数据传输率、频谱效率以及传输的可靠性。

On the other hand , adaptive modulation technique can enhance data rate , spectrum efficiency and transmission reliability in MIMO-OFDM systems .

LTE-Advanced系统在带宽、用户数据速率、系统频谱效率等方面提出了更高的需求。

LTE-Advanced system demands more on bandwidth , user data rate and spectral efficiency .

MIMO和OFDM的结合可得到MIMOOFDM系统，它能使提供更大的覆盖范围，更好的传输质量，更大的数据速率和频谱效率。

A MIMO-OFDM system is a seamless merger of MIMO and OFDM , which can potentially provide larger coverage range , more reliable transmission , higher date rate and spectrum efficiency .

数据传输速率和频谱效率的提升分别源于MIMO和OFDM的方案在空域和频域上的并行传输技术。

The enhancements of data rate and spectral efficiency come from the fact that MIMO and OFDM schemes are indeed parallel transmission technologies in the space and frequency domains , respectively .

本文研究了基于OFDM技术的WiMAX小区规划方案，给出了各种提高频谱效率的方案；

This paper investigates the cell planning strategy of the OFDM based WiMAX system , in which various frequency planning mechanisms for improving the frequency efficiency are proposed .

多入多出（MIMO）技术引入空域的维度，可以在不增加系统带宽和发射功率的基础上显著提高信道的频谱效率和链路的可靠性。

By introducing spatial dimension , multiple-input multiple-output ( MIMO ) technique delivers significant performance enhancements in terms of spectrum efficiency and link reliability without adding system bandwidth or transmission power .

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。

MIMO-OFDM has been regarded as the key technology of B3G communication system because it can improve system capacity and spectrum efficiency .

LTE（LongTermEvolution）较3G无线技术明显提高了峰值速率和峰值频谱效率，改善了小区边缘用户性能，提高了小区容量和降低了系统时延。

LTE ( Long Term Evolution ) has obviously improved peak rate , peak spectrum efficiency , enhanced the performance on the cell edge , increased cell capacity and decreased system latency compared to 3G wireless technology .

π/4-QPSK是四进制相移键控（QPSK）的改进方式，具有较高的频谱效率和较好的抗噪声性能。

π / 4-QPSK ( Quaternary Phase Shift Keying ), an improved QPSK modulation , possess hig-her frequency efficiency and antinoise ability .