Symbols are then mapped to subcarriers and transmitted via antennas.
然后，符号将会映射到副载波，并且经由天线传送。
In OFDMA, closely spaced multiple subcarriers are assigned to different users for parallel data transmission.
在OFDMA中，相临的多个子载波被分配给不同的用户来为用户并行低速传输数据。
The modulating vectors for the subcarriers consist of the information-bearing components and the reduction components.
子载波调制矢量包括信息元分量和抑制元分量。
Allocation of antennas and subcarriers is one of most important issue for multiuser MIMO-OFDM system radio resource management.
天线与子载波分配是多用户MIMO - OFDM系统无线资源管理中的重要内容。
In view of orthogonality between subcarriers of OFDM system, effect of the finite order of digit shaping filter is discussed in this paper.
从OFDM系统子载波正交性要求出发，讨论了数字成形滤波器阶数有限效应。
In this paper, the pilot subcarriers on two consecutive OFDM symbols are utilized for joint frequency offset correction and channel estimation.
基于连续OFDM符号上的导频子载波，给出了联合频率偏移纠正和信道估计方法。
The method also includes encoding idle information on a second portion of subcarriers if it is determined that the symbol in not the active symbol.
所述方法还包含：如果确定所述符号并非所述活动符号，那么在第二部分副载波上对闲置信息进行编码。
These large peaks cause saturation in power amplifiers, leading to intermodulation products among the subcarriers and disturbing out of band energy.
大的峰值会使功率放大器饱和，在子载波间产生交调干扰和导致能量的带外弥散。
In practical OFDM systems, virtual subcarriers are usually used to avoid the transmitted data being distorted by the low-pass filter on the transmitter side.
实际的OFDM系统通常会使用虚拟子载波，以此来避免发送信号受到发送端成形低通滤波器的影响。
Furthermore, we propose an adaptive subcarrier re-allocation algorithm for the OFDM-based system. The algorithm could allocate all subcarriers flexibly by the greatest extent.
提出了基于OFDM系统的自适应子载波重分配算法，该算法能够最大程度地灵活分配所有子载波。
The emphases is the improvement to the quondam algorithm, namely, the hybrid maximum-likelihood estimation algorithm based on the information of both CP and pilot subcarriers.
重点分析了将循环前缀与导频子载波的冗余信息相结合的算法，相应地对原有算法的似然函数也进行了改进。
The system uses time-frequency tracking loops to extract phase errors from data subcarriers with frequency interpolation to compensate for the estimated carrier frequency offsets.
该方法使用了时频同步跟踪环路，从数据子载波提取相位误差，并利用频域插值补偿多个用户的估计频偏。
The ratio of peak and average power in multi carrier system is much larger than that in single carrier system, and may grow unboundedly as the number of subcarriers grows to infinity.
多载波信号的峰值平均功率比远远大于单载波系统，而且峰平比随着子载波个数无限增长。
It is shown that our analyzer has the ability to guide the receiver to lock on the carrier even when the carrier amplitude is smaller than that of the subsidiary lines of subcarriers.
分析表明，甚至在载波谱线低于副载波谱线时，该分析器也能把精密跟踪接收机引导到载波上而不致错锁。
A new blind frequency offset estimation method based on cyclic prefix and virtual subcarriers in coherent optical orthogonal frequency division multiplexing (CO-OFDM) system is presented.
在相干光正交频分复用系统中，本文提出了一种新型的基于循环前缀和虚载波的盲频偏估计方法。
Timing offset causes inter-symbol interference, and frequency offset would destroy the orthogonality between subcarriers, causing ICI, which lead to a sharp decline in overall system performance.
定时偏差会导致码间干扰，频率偏差会破坏子载波间的正交性，引起子载波间干扰，从而使系统整体性能急剧下降。
In current OFDM systems, only a single user can transmit on all of the subcarriers at any given time, and time division or frequency division multiple access is employed to support multiple users.
在目前的OFDM系统中，在任何一个特定的时间，只有一个用户可以在所有副载波上进行传送；利用时分或者频分多路访问机制来支持多个用户。
In current OFDM systems, only a single user can transmit on all of the subcarriers at any given time, and time division or frequency division multiple access is employed to support multiple users.
在目前的OFDM系统中，在任何一个特定的时间，只有一个用户可以在所有副载波上进行传送；利用时分或者频分多路访问机制来支持多个用户。
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