Data transmission method for decreasing multipath delay interference
A technology of multipath delay and data transmission method, which is applied in the field of data transmission and can solve the problems of affecting the reception of signals by the receiving end, destroying the multipath effect structure, and symbol interference.
Active Publication Date: 2011-07-27
HUAWEI TECH CO LTD
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In addition, since the multipath of different users may be different, when all users adopt the same CP length, the multipath delay spread of some users may also be larger than the CP length, thus causing inter-symbol interference and destroying multiple The path effect is used as a circular convolution structure, causing the multipath effect to affect the reception of the signal at the receiving end
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[0023] The present invention provides a data transmission method, so that when transmitting data, the length of the cyclic prefix (CP) can be flexibly adjusted according to the needs, so as to avoid the occurrence of multipath delay exceeding the length of the cyclic prefix and reduce the demodulation efficiency. performance. Data transmission of the present invention comprises the following steps:
[0024] Step 1: For the modulated data signal, use the transmit pulse shaping corresponding to the selected frequency block to transmit the modulated data signal to generate a signal of one symbol period excluding the cyclic prefix CP.
[0025] Step 2: determine whether to increase the length of the cyclic prefix, and if so, send the repetition signal P as the length of the increased cyclic prefix information, and send the CP.
[0026] Judging whether to increase the length of the cyclic prefix is performed by estimating the multipath delay spread. After the terminal sends a si...
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The invention relates to a data sending method for reducing the multi-path delay interference, which comprises: based on the modulated data signal, using the emit impulse model relative to the frequency block used to transmit said data signal, to generate one signal at one mark period that not comprises circle prefix CP; via judging if the multi-path delay expansion is larger than the length of circle prefix CP, to judge if needs to increase the length of circle prefix CP; if needs, repeating transmitting the signal as the increased circle prefix information to be sent out with the circle prefix CP; the signal sending method comprises: sending said signal at the tail of present mark and before the tail circle prefix signal of next mark, or sending said signal at the back of circle prefix of present mark and the most front of next mark. The invention can increase the length of circle prefix to reduce the interference of multi-path delay, based on different fading conditions and different users.
Description
technical field [0001] The invention relates to the technical field of data transmission, in particular to a data transmission method for reducing multipath delay interference. Background technique [0002] The 3GPP WG1 proposal R1-050254 proposes that when transmitting data, a localized single carrier technology (localized single carrier) can be used to transmit data. Partial single-carrier technology is to carry data signals through time-domain waveforms belonging to a frequency block (chunk) in frequency, such as figure 1 A schematic diagram showing a partial frequency block for single-carrier transmission data. For the data transmission process, multipath of signal transmission will inevitably occur. Multipath refers to the fact that a receiving end will receive electromagnetic waves with different amplitudes, phases, and arrival times due to reflection, diffraction, and scattering by buildings during the transmission process of the signal at the transmitting end. In ...
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IPC IPC(8): H04L27/01H04L25/03
Inventor 曲秉玉
Owner HUAWEI TECH CO LTD