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Downlink base-band signal generation method and device, and base station

A baseband signal and signal coverage technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve problems such as increasing system delay, reducing practicability, and extending symbol time

Inactive Publication Date: 2013-09-18
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods have their own shortcomings and deficiencies. Specifically, the time-domain windowing technology prolongs the symbol time and brings a certain amount of intersymbol interference (ISI, InterSymbol interference); adding the guard band technology will lead to a certain effective bandwidth Waste; the performance of the multi-choice sorting method decreases when the number of subcarriers increases, resulting in a reduction in its practicability in existing systems; the optimization algorithm of the constellation expansion method, due to its many restrictions and threshold settings, Lack of industrial realizability; Spectrum precoding technology introduces Singular Value Decomposition (SVD, Sigular Value Decomposition) at the transmitter, which will inevitably increase a certain system delay and lead to system performance degradation

Method used

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  • Downlink base-band signal generation method and device, and base station
  • Downlink base-band signal generation method and device, and base station
  • Downlink base-band signal generation method and device, and base station

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0132] In this embodiment, the out-of-band emission requirements for baseband signals come from internal control conditions. Assuming that TS36.104 puts higher requirements on the double-sided out-of-band radiation of the base station, specifically, on the left side of the channel bandwidth (ie, the left side of the negative frequency range of the channel bandwidth), from the frequency range -f 2 to -f 1 (f 1 > f 2 >10), the total power of out-of-band radiation is not greater than P l ; On the right side of the channel bandwidth (ie, the right side of the positive frequency range of the channel bandwidth), from the frequency range f 3 to f 4 (f 4 > f 3 >10), the total power of out-of-band radiation is not greater than P r . When the system downlink bandwidth is 20MHz, the number of weighted effective subcarriers bound to the bandwidth is 10, and they are distributed on the left and right edges of the effective data subcarriers on the frequency spectrum. Specifically, ...

Embodiment 2

[0142] In this embodiment, the out-of-band emission requirements for baseband signals come from internal control conditions. Assuming that TS36.104 puts higher requirements on the SSB out-of-band radiation of the base station, specifically, on the left side of the channel bandwidth (ie, the left side of the negative frequency range of the channel bandwidth), from the frequency range -f 2 to -f 1 (f 1 > f 2 >10), the total power of out-of-band radiation is not greater than P l , on the right side of the channel bandwidth (i.e., the right side of the positive frequency range of the channel bandwidth), from the frequency range f 3 to f 4 (f 4 > f 3 >10), the total power of out-of-band radiation is not greater than P r . In the case of a system downlink bandwidth of 20MHz, the number of weighted effective subcarriers bound to the bandwidth is 10, but the positions of these 10 weighted effective subcarriers are uncertain. According to the principle of permutation and combin...

Embodiment 3

[0152] The difference between this embodiment and Embodiment 1 is that the number of subcarriers participating in weighting is a system-configurable value. In this embodiment, the number of subcarriers participating in weighting is configured to be 8. Then, the inequality to be solved is :

[0153] ∫ - f 2 - f 1 [ ( Σ n = - 596 , n ≠ 0 596 ...

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Abstract

The invention discloses a downlink base-band signal generation method, a downlink base-band signal generation device and a base station. The method comprises the following steps that the base station calculates a weight value of a related sub-carrier in a channel bandwidth according to a preset control condition, and generates a base-band signal according to a weight value calculation result. According to the method, the device and the base station, the out-of-band radiation of an OFDM (orthogonal frequency division multiplexing) signal can be effectively suppressed, and the utilization rate of a frequency spectrum is increased. When the technical scheme is applied to a cognitive radio system, the interference of a secondary system to a primary system can be reduced, and a white space which cannot be used by an original OFDM signal can even be effectively utilized, so that the utilization efficiency of the frequency spectrum is radically improved.

Description

technical field [0001] The present invention relates to a baseband signal generation technology, in particular to a downlink baseband signal generation method and device, and a base station. Background technique [0002] With the continuous advancement of radio technology, a large number of various radio services have emerged, but the spectrum resources on which radio services rely are limited. Facing the continuous increase in people's demand for bandwidth, spectrum resources are extremely tight. On the one hand, this is due to the fact that the new generation of transmission technology based on Orthogonal Frequency Division Multiplexing (OFDM, Orthogonal Frequency Division Multiplexing) has high out-of-band radiation characteristics, which requires a large frequency guard band; Under the traditional fixed spectrum allocation mode, the utilization rate of spectrum resources is not high. In a sense, the allocation system that fixedly allocates specific spectrum to authorize...

Claims

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Application Information

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IPC IPC(8): H04L5/00
Inventor 周栋李岩刘星任龙涛
Owner ZTE CORP
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