重叠复用原理下加性白高斯噪声信道的容量

来源 :北京邮电大学学报 | 被引量 : 0次 | 上传用户:
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为建立超大容量通信系统提供全新的理论依据,证明了在高斯白噪声干扰环境下,当信道传输函数H(f)的单边带宽限定为B时,仙侬仅利用时间域间隔为1/2B的独立样点荷载信息是不够的,还应该根据重叠复用原理,同时使用频率域间隔为B/K独立样点的重叠频域复用技术,使系统容量与K成正比.由于带宽为B信道冲击响应的持续时间T趋近于无穷,频率域独立样点间隔1/T为0,K不受限制;同理,当信道冲激响应函数h(t)的持续时间限定为T时,像正交频分复用那样仅利用频率域间隔为1/T的独立样点去荷载信息是不够的,还应该根据重叠复用原理,用时间域间隔为T/K独立样点的重叠时域复用技术,使系统容量与K成正比.由于冲击响应持续时间为T信道的带宽B趋近于无穷,时间域独立样点间隔1/2B为0,所以K不受限制.此外,还证明了重叠复用的实质是建立超大容量的独立并联高斯信道. It provides a new theoretical basis for the establishment of a VLSI system. It is proved that when the unilateral bandwidth of the channel transfer function H (f) is limited to B in Gaussian white noise environment, Of the independent sample load information is not enough, but also should be based on the principle of overlapping multiplexing, while using the frequency domain interval is B / K independent samples overlapping frequency domain multiplexing technology, the system capacity and K is proportional to the bandwidth of B The duration T of channel impulse response approaches to infinity, and the interval of independent samples in frequency domain 1 / T is 0 and K is unrestricted. Similarly, when the duration of channel impulse response function h (t) is limited to T, As with orthogonal frequency division multiplexing, it is not enough to use only independent samples with an interval of 1 / T in the frequency domain to load information. In addition, according to the principle of overlap multiplexing, when the time domain interval is an overlap of T / K independent samples The domain multiplexing technique allows the system capacity to be proportional to K. The K is unlimited because the impact response duration is that the bandwidth B of the T channel approaches infinity and the time domain independent sample interval 1 / 2B is zero. It is proved that the essence of overlap multiplexing is to build an independent parallel Gaussian channel with large capacity.
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