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1)  time-frequency spread
时频二维扩展
1.
This article propose a time-frequency spread CDMA system which every user usea frequency spread code and a group of time spread codes.
本文旨在提出一种基于时域和频域二维扩展的多载波CDMA系统,通过时频二维扩展获得更大的分集增益,同时利用时域扩展码组的正交性,对用户多普勒频移产生的载波间干扰(ICI)进行抑制以克服传统多载波系统对多普勒频移的敏感性。
2)  Time-frequency domain spread spectrum
时频二维扩频
3)  two-dimension spread spectrum system
二维扩展频谱系统
1.
Hence PARAFAC(PARArallel FACtor) receiver algorithm for two-dimension spread spectrum system is proposed in this paper.
对二维扩展频谱系统的接收信号经过IDFT(离散傅里叶反变换)模块后的信号进行分析,表明此信号具有三线性模型特征;为此,提出了二维扩展频谱系统下PARAFAC(平行因子)接收机算法,该算法先利用三线性交替最小二乘(TALS)算法估计出信源矩阵,然后对其进行判决。
4)  two-dimensional spread spectrum
二维扩频
1.
Because of two-dimensional spread spectrum, the system can contain more users in the whole system.
该系统能更有效地利用传输带宽 ,实现频率分集 ,并且由于是二维扩频 ,所以该系统有更强的多址能力。
2.
two-dimensional spread spectrum technology.
简要介绍了两种典型的一维扩频技术,即DS-CDMA和MC-CDMA,在此基础上重点分析了一种新的扩频技术,即二维扩频技术。
3.
In this paper,we analyze the BER performance of pilot symbol assisted two-dimensional spread spectrum systems with coherent demodulation in multi-path fading channels.
在多径衰落信道中,本文分析了导引辅助的二维扩频相干解调的误码率性能。
5)  two dimensional spread spectrum
二维扩频
1.
The architecture of an M-ary two dimensional spread spectrum (M-2DSS) system which is motivated by combining two dimensional spread spectrum with M-ary spread spectrum is proposed.
本文基于广义二维扩频的方法,结合M-ary扩频方式,提出了一种M-ary广义二维扩频的方法,给出了该方法的发射机和接收机的工作原理。
2.
A novel differential detection method, called Two-Dimensional chip-level differential detection (2D-CLDD) is proposed, the chip-level differential detection is performed in both time domain and frequency domain in two dimensional spread spectrum system, and the channel s fading effect on both time domain and frequency domain can be decreased in 2D-CLDD.
本文提出了一种新颖的差分检测方案:二维码片级差分检测,和传统的差分检测方案不同,这个方案在二维扩频系统中,对时频二维实现码片级差分检测,可以在时频二维同时降低信道衰落带来的影响。
6)  two dimensional frequency-hopping time-spreading code
二维频域跳频时域扩频码
补充资料:哭李频员外时在建川
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【出处】:
全唐诗:卷716-35
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