Communication method, delay extension method and device
A communication method and channel technology, applied in the direction of modulated carrier system, transmission system, multi-frequency code system, etc., can solve the problems of pulse width expansion of received signals, sensitivity to multipath effects, subcarrier orthogonality on interference frequency, etc.
Active Publication Date: 2020-10-20
ANQING NORMAL UNIV
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[0003] However, the millimeter-wave Massive MIMO communication system is more sensitive to multipath effects due to its high frequency
The multipath effect will extend the pulse width of the received signal
For digital signals, the limit of transmission multipath delay is a digital signal cycle. If the limit of transmission multipath delay is exceeded, waveform broadening will cause OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) in the time domain. technology) interference between symbols and the destruction of orthogonality between subcarriers on frequency
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[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0049] Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the drawings, and the related Other details are not relevant to the invention.
[0050] figure 1 It is a schematic flowchart of a communication method according to an embodiment of the present invention. like figure 1 As shown, the communication method in some embodiments may include the following steps S110 to S160. The co...
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The invention provides a communication method and a delay expansion method and a device, and the method comprises the steps: adding a zero-power channel state information reference signal after the last symbol of a channel state information reference signal, and obtaining a first reference signal; adding an extended cyclic prefix to the first reference signal to obtain a second reference signal; sending the second reference signal to a channel, and sending the second reference signal to the user equipment from different emission directions so that the user equipment obtains the receiving powerof the second reference signal in each emission direction and compares the receiving power to obtain the maximum receiving power; receiving the maximum received power related information fed back bythe user equipment; obtaining a scanning beam in a corresponding transmitting direction according to the related information, and carrying out sidelobe suppression; and transmitting data to the user equipment based on the scanning beam after sidelobe suppression. Through the above scheme, multipath components causing excessive delay spread can be suppressed, and the signal-to-noise ratio of the signal is maintained by the wave beam under the condition of a non-direct channel.
Description
technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a communication method, a delay expansion method and a device. Background technique [0002] In the prior art, a millimeter-wave Massive MIMO (massive antenna technology) communication system can simultaneously use one time-frequency block resource through hundreds of antennas, thereby breaking through the practice of the existing multi-antenna system. However, the power transmitted on each antenna of millimeter-wave MassiveMIMO is reduced. Therefore, by concentrating energy in a smaller space, the throughput rate and radiation energy efficiency are significantly improved. [0003] However, the millimeter-wave Massive MIMO communication system is more sensitive to multipath effects due to its high frequency. The multipath effect will extend the pulse width of the received signal. For digital signals, the limit of transmission multipath delay is a digi...
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IPC IPC(8): H04L27/26H04L25/02H04B7/0413H04B17/318H04B17/336H04B17/382
CPCH04L27/261H04L27/2626H04L25/0224H04B7/0413H04B17/318H04B17/336H04B17/382Y02D30/70
Inventor 张利伟郭云德陈力黄星张平伟
Owner ANQING NORMAL UNIV