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A method and device for generating an OFDM baseband signal
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A baseband signal and symbol technology, applied in the field of communication, can solve problems such as OFDM baseband signal phase offset
Active Publication Date: 2021-04-13
VIVO MOBILE COMM CO LTD
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[0005] Embodiments of the present invention provide a method and device for generating OFDM baseband signals to solve the problem of phase shift in existing OFDM baseband signals
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Embodiment 1
[0061] figure 2 A schematic flow diagram of a method for generating an OFDM baseband signal provided by an embodiment of the present invention is shown, as shown in figure 2 As shown, the OFDM baseband signal generation method may include:
[0062] S201. The transmitting end device determines the frequency offset of the first OFDM baseband signal according to the first frequency interval and the unit frequency interval.
[0063] In the embodiment of the present invention, the above-mentioned first frequency interval is between the first subcarrier (ie subcarrier 0) of the SSB and the first subcarrier (ie subcarrier 0) of the first common resource block transmitting the SSB frequency interval. Of course, the first frequency interval may also be the frequency interval between the first subcarrier of the SSB and the second subcarrier transmitting the first common resource block of the SSB, and the numbers of the first subcarrier and the second subcarrier are the same .
[006...
example 1
[0082] Example 1: When {SSB SCS, PDCCH / PDSCH SCS} = {30, 15}kHz, k 1 ∈{-0.5,0}. If the frequency interval between the subcarrier 0 of the SSB and the subcarrier 0 transmitting the first common resource block of the SSB is an odd number of 15kHz subcarriers, k 1 = -0.5, otherwise k 1 =0.
example 2
[0083] Example 2: When {SSB SCS, PDCCH / PDSCH SCS} = {30, 30}kHz, k 1 ∈{-0.5,0}. If the frequency interval between subcarrier 0 of the SSB and subcarrier 0 of the first common resource block transmitting the SSB is an odd number of 15kHz subcarriers, k 1 = -0.5, otherwise k 1 =0.
[0084] For example, in a scenario higher than 6 GHz, the unit frequency interval is the subcarrier interval of the PDCCH / PDSCH.
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Abstract
Embodiments of the present invention provide a method and device for generating an OFDM baseband signal, which relate to the field of communication technology and solve the problem of phase offset in the existing OFDM baseband signal. The method includes: determining the frequency offset of the first OFDM baseband signal according to the first frequency interval and the unit frequency interval, or the first frequency interval and the subcarrier interval of the SSB; wherein, the first frequency interval is the first frequency interval of the SSB The frequency interval between subcarriers and the first subcarrier of the first common resource block transmitting the SSB; the SSB is mapped on M OFDM symbols, one OFDM symbol corresponds to one OFDM baseband signal, and the first OFDM baseband signal is M One OFDM baseband signal corresponding to the first OFDM symbol among the OFDM baseband signals; generating the first OFDM baseband signal according to the frequency offset and the data symbol carried by the resource element on the first OFDM symbol.
Description
technical field [0001] The present invention relates to the field of communication technologies, in particular to a method and device for generating an Orthogonal Frequency Division Multiplexing (OFDM) baseband signal. Background technique [0002] At present, in the 5G NR system, the subcarrier spacing (Subcarrier Spacing, SCS) of the synchronization signal block (Synchronization signal&PBCH Block, SSB) and the physical downlink control channel (Physical Downlink Control Channel, PDCCH) / physical downlink shared channel (Physical Downlink Shared Channel) , PDSCH) SCS supports the following combination: {SSB SCS, PDCCH / PDSCH SCS} = {{15, 15}, {15, 30}, {30, 15}, {30, 30}, {120, 60} , {120, 120}, {240, 60}, {240, 120}}kHz. Among them, the combination of {{15, 15}, {15, 30}, {30, 15}, {30, 30}}kHz is a combination that can be used below 6GHz; {{120, 60}, { The combination of 120, 120}, {240, 60}, {240, 120}}kHz is a combination that can be used above 6GHz. [0003] In the pri...
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