自适应子载波组分配算法。
子载波调制矢量包括信息元分量和抑制元分量。
The modulating vectors for the subcarriers consist of the information-bearing components and the reduction components.
这将导致子载波间隔更窄，ICI的程度更严重。
This will result in a narrower sub-carrier interval and worse ICI.
用预定的导频调制机制来调制每个导频子载波信号。
Each pilot sub- carrier signal is modulated with a predetermined pilot modulation scheme.
比特和子载波动态分配技术是OFDM的关键技术之一。
Bit and subcarrier dynamic allocation technique is one of the key techniques in OFDM.
第二种方法是基于虚拟子载波的子空间盲信道估计方法。
The second method is based on the virtual sub-carrier subspace blind channel estimation method.
与单载波系统相比，OFDM系统存在多个正交子载波。
OFDM systems contain more than one orthogonal sub-carrier, so it is different from single carrier systems.
研究协作OFDM系统的功率分配和子载波配对，并分析系统的中断性能。
Secondly, the power allocation and subcarrier pairing for cooperative OFDM systems were researched and the outage proformance was analysed.
对于非实时用户，按照数据率比例公平的要求，子载波和功率分配分离进行。
Subcarrier and power allocation is performed separately for non-real time users with the proportional rate constraints.
研究了基于正交空时分组码的多用户OFDM系统的自适应子载波分配算法。
An adaptive subcarrier allocation algorithm for multiuser OSTBC-OFDM system 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 view of orthogonality between subcarriers of OFDM system, effect of the finite order of digit shaping filter is discussed in this paper.
但该方法占用专门的子载波或时隙，降低了系统的频谱利用率和信息传输速率。
But this method occupies the special sub-carriers or time slots and then reduces the system spectrum efficiency and data transmission rate.
根据比例公平准则，MC - PFS通过遗传算法搜索最优子载波分配方案。
According to the criterion of proportional fairness, MC-PFS searches optimal subcarrier allocation scheme on basis of GA.
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。
These large peaks cause saturation in power amplifiers, leading to intermodulation products among the subcarriers and disturbing out of band energy.
在保持子载波数恒定的条件下减少循环前缀的长度，并推导出最优分集合并系数。
We reduce the length of cyclic prefix (CP) while the number of carriers remains invariable and the optimal diversity combination coefficients were deduced.
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。
In this paper, the pilot subcarriers on two consecutive OFDM symbols are utilized for joint frequency offset correction and channel estimation.
与当前通过编码的相移键控(PSK)调制相对，还存在另外的通过子载波的调制。
Compared to current phase shift keying (PSK) modulation by a code, there is a further modulation by a sub-carrier.
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。
Allocation of antennas and subcarriers is one of most important issue for multiuser MIMO-OFDM system radio resource management.
针对MC - CD MA系统的上行链路提出了一种自适应子载波和功率分配算法。
Finally, an adaptive subchannel and power allocation scheme for MC-CDMA system is proposed.
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。
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.
该算法基于凸优化理论，对功率分配、子载波配对、中继选择和用户选择进行了联合优化。
Based on the convex optimization, the algorithm jointly optimizes power allocation, subcarrier pairing, relay selection and user selection.
OFDM信号包括多个符号，每个符号具有多个携带数据的近间隔的正交数据子载波信号。
The OFDM signal includes multiple symbols, each symbol having a plurality of closely- spaced, orthogonal data sub-carrier signals carrying data.
模拟结果表明引入子载波分组后系统性能依然保持良好，并且信道估计偏差对本算法的影响较小。
Simulation results show that subcarrier grouping just has a little influence on system performance. Meanwhile the imperfect channel estimation has little effects on the present algorithm.
随后为降低求解该优化问题的复杂度，提出两步次优算法，将问题分解为子载波分配和功率分配。
Then, to reduce the complexity, we propose a two-step suboptimal algorithm that separates subcarrier and power allocation.
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。
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.
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。
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.
在基于频域导频的信道估计中，研究了导频子载波处的信道估计方法和数据子载波处的信道估计方法。
In the frequency domain pilot channel estimation, this thesis studies the pilot subcarrier and data subcarrier channel estimation algorithms.
针对多用户MIMO- OFDM通信网络，提出了一种基于系统和容量最大化的子载波分配算法。
A subcarrier allocation algorithm is presented for multiuser MIMO-OFDM communication network based on maximum of the system sum capacity.
它先将原始数据流复制成多路并行数据，经频域扩频和时域扩频，再调制到互相正交的子载波上传输。
It copies the original data stream to several parallel data streams, spreads them in both time and frequency domain, then modulates them to orthogonal sub-carriers for transmission.
通过对信道状态信息进行判断，利用贪婪算法将用户子载波分配的比特取整，以实现系统功率最小化。
Then, the bit was rounded by the greedy algorithm with the channel state information judgment, to obtain the minimized transmission power of the system.
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