Method and apparatus lowering peak average ratio

A peak-to-average ratio, one-way technology, applied in space transmit diversity, transmission system, multi-frequency code system, etc., can solve the problems of data peak-to-average ratio cannot be improved, angle design difficulties, and PAR reduction, etc., to achieve easy FPGA implementation. , reducing the peak-to-average ratio and the effect of less multiplication resources

Active Publication Date: 2009-02-04
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

In many cases, this fixed phase rotation cannot minimize the power of Midamble codes. At the same time, as the number of carriers increases, the design of the angle becomes more and more difficult.
In addition, the phase of the data is random, and the peak-to-average ratio of the data cannot be improved fundamentally, so the carrier rotation with a fixed phase in the baseband is very limited to reduce PAR

Method used

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  • Method and apparatus lowering peak average ratio
  • Method and apparatus lowering peak average ratio
  • Method and apparatus lowering peak average ratio

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specific Embodiment 5

[0108] Specific embodiment 5, in the above embodiments, the peak optimization phase selection unit 451 may not be inside the phase rotation device 45, but outside the phase rotation unit 45, and is used to select the most suitable phase before the phase rotation unit 45 performs phase rotation. phase, and then output the selected phase to the phase rotation unit 45, such as Figure 8 shown.

[0109] Specifically, after intermediate frequency filtering and complex modulation, the carrier data is sent to the peak-optimized phase selection device 4511, and the same steps as above are performed in the peak-optimized phase rotation 4511, and the different peak values ​​of each carrier on the Ka antennas are calculated Power point, take the maximum carrier peak power point as the maximum peak power of the antenna, select the minimum peak power point PAR low = , min 1 ...

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Abstract

The invention provides a method to reduce peak-to-average power ratio including: A. generating multi-carrier base band signals according to received multi-carrier bit data, and finishing IF filtering and plural modulations to base band signals; B. Processing phase rotation based on time slot to the carrier signals after the plural modulations. C. Processing multi-carrier superposition to the signals after phase rotation. The invention also provides a device for reducing peak-to-average power ratio. The method and the device can avoid the peak through processing the phase rotation after the IF interpolation filtering so that the peak-to-average power ratio is effectively reduced and the more the carrier increases, the more obvious the peak-to-average power ratio is reduced. The multiplex phase rotation can go on parallel processing with no convolution operation and less multiplication resources so that FPGA is easy to realize without any deterioration of EVM and of BER. TD-SCDMA uses correlation detection so as to avoid the transmission of the phase rotation information.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a method and device for reducing peak-to-average ratio. Background technique [0002] For the TD-SCDMA system, reducing the peak-to-average ratio in the mobile communication system and using multi-carrier technology can enable the base station equipment to support more users or provide greater coverage and improve system capacity, thereby reducing the number of base stations and station Substantial reduction in address, so that the system operator to reduce investment. [0003] The TD-SCDMA time slot signal has a total of 848 chips (chips), and its structure is as follows figure 1 As shown, the Midamble (training sequence) in the middle of the burst signal is used for channel estimation, and the data blocks on both sides are used to transmit service data. For the same time slot in the same cell, given a basic midamble code as the basic code, different users use dif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04B7/216H04B1/707H04L27/26
CPCY02D30/70
Inventor 熊军
Owner DATANG MOBILE COMM EQUIP CO LTD
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