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1·The statistic model of air-ground radio communication channel is characterized by the multipath fading, Doppler power spectrum and delay power spectrum.

空地通信信道的主要统计特性包括多径衰落特性、多普勒功率谱和时延功率谱。

2·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。

3·This new scheme has the advantages of high spectrum efficiency and suppression of multipath spread, frequency selective fading, jamming and noise.

该体制具有较高的频率利用率，可有效地抑制短波信道中多径时延、频率选择性衰落、人为干扰与噪声带来的不利影响。

4·The biggest merit of OFDMA is the ability to resist frequency - selective fading, simultaneously can raise the frequency spectrum efficiency effectively.

OFDMA的最大的优点是能够抵抗频率选择性衰落，同时能够有效地提高频谱效率。

5·When designing a special type small satellite (STSS) communication system with spread-spectrum technology, the fading and the interference must be considered carefully.

对于特种小卫星扩频通信系统，衰落及干扰状况是系统设计时必须考虑的重要方面。

6·The wireless propagation environment is described first: analyzing the small-scaled fading, including amplitude fading, multi-path time delay and Doppler spectrum spread.

在本论文中，首先对移动传播环境作了描述，特别是对小尺度多径传播造成的幅度衰落，多径时延和多普勒频移进行了分析；

7·It is a true blind detection algorithm in that it needs no knowledge of channel fading information as well as time domain and frequency domain spread spectrum codes.

该算法无需时域扩频码、频域扩频码和信道衰落信息，是一种真正意义上的盲的检测算法。

8·The existing point to point communication methods limited by the spectrum of resources and fading channel has been unable to meet demand.

现有的点对点通信方式受频谱资源和信道衰落等的限制已经无法满足需求。