Two-dimensional spread-spectrum based channel estimation method
A channel estimation and direct sequence spread spectrum technology, applied in the field of wireless mobile communication systems, can solve the problems of high complexity, inaccurate estimation, and complicated calculation, so as to reduce the influence of channel frequency selectivity, improve accuracy, reduce Effects of Inter-Path Interference
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[0075] The system composition of a channel estimation method based on two-dimensional spread spectrum of the present invention is shown in FIG. 5, including: Discrete Fourier Transform (DFT: Discrete Fourier Transform) module 21, guide extraction module 27, complex number division module 28, time Domain averaging module 29, Inverse Discrete Fourier Transform (IDFT) module 30.
[0076] Next, take the spreading gain of the pilot signal of the transmitter N=256, and the frequency domain despreading processing gain N f =16, time domain despreading processing gain N t = 16, channel estimation in a pilot symbol is taken as an example, and the signal processing steps of the channel estimation of the present invention are explained in combination with a time domain receiver and a frequency domain receiver.
[0077] Channel estimation methods for time-domain receivers include:
[0078] Receiver front-end processing steps The received signal is received by the receiving antenna and sent to ...
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