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A transmitting method, receiving method and device for reducing out-of-band radiation

An out-of-band radiation and to-be-sent technology, applied in the field of communications, can solve the problem of high computational complexity

Active Publication Date: 2016-03-30
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When reducing the out-of-band radiation in the prior art, it is necessary to first calculate the out-of-band radiation intensity generated by the sub-carriers, calculate the coefficients or matrices of all sub-carriers according to the calculated out-of-band radiation intensity, and then reduce the out-of-band radiation according to the calculated coefficients or matrices. Radiation, higher computational complexity

Method used

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  • A transmitting method, receiving method and device for reducing out-of-band radiation
  • A transmitting method, receiving method and device for reducing out-of-band radiation
  • A transmitting method, receiving method and device for reducing out-of-band radiation

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Embodiment 1

[0037] Such as figure 1 As shown, the embodiment of the present invention provides a method for reducing out-of-band radiation emission, including:

[0038] Step 101: Divide OFDM subcarriers into subcarrier pairs, each subcarrier pair includes two adjacent OFDM subcarriers, and each OFDM subcarrier is divided into at most one subcarrier pair;

[0039] Step 102: Map each constellation symbol included in the data bit stream to be sent to the two OFDM subcarriers included in the subcarrier pair corresponding to each constellation symbol through two preset complex weighting coefficients to offset the two OFDM Out-of-band radiation generated by subcarriers;

[0040] Step 103: Perform IFFT (InverseFastFourierTransform, Inverse Fast Fourier Transform) transformation on the mapped data bit stream to be sent and insert CP (CyclicPrefix, cyclic prefix) to form an OFDM baseband signal, and transmit the formed OFDM baseband signal.

[0041] In the embodiment of the present invention, OF...

Embodiment 2

[0043] The embodiment of the present invention provides a transmission method for reducing out-of-band radiation. The transmitting end uses the method provided in this embodiment to form an OFDM baseband signal and transmit the generated OFDM baseband signal. Refer to figure 2, the method includes:

[0044] Step 201: Encoding and modulating the data bit stream to be transmitted to obtain constellation symbols included in the data bit stream to be transmitted;

[0045] Assume that the data bit stream to be transmitted obtained by encoding and modulating the data bit stream to be transmitted includes K constellation symbols, and the K constellation symbols included in the data bit stream to be sent can be expressed as [s 1 ,s 2 ,...,s k ].

[0046] Step 202: Divide the OFDM subcarriers at the transmitting end into one or more subcarrier pairs, each subcarrier pair includes two adjacent OFDM subcarriers, and each OFDM subcarrier is divided into at most one subcarrier pair;

...

Embodiment 3

[0069] Such as Figure 7 As shown, the embodiment of the present invention provides a receiving method for reducing out-of-band radiation. The method receives the OFDM baseband signal sent by Embodiment 1, including:

[0070] Step 301: receive the OFDM baseband signal, remove the CP in the OFDM baseband signal, and perform FFT (FastFourierTransformation, Fast Fourier Transformation) transformation on the OFDM baseband signal to obtain each subcarrier pair included in the OFDM baseband signal;

[0071] Step 302: extracting two transmission symbols transmitted by each subcarrier pair from the two OFDM subcarriers included in each subcarrier pair;

[0072] Step 303: Combine the two transmission symbols transmitted by each subcarrier pair to obtain a constellation symbol corresponding to each subcarrier pair.

[0073] In the embodiment of the present invention, the OFDM baseband signal is received, each subcarrier pair included in the OFDM baseband signal is obtained, two transmi...

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Abstract

The invention discloses a sending method, a receiving method and a device capable of lowering out-of-band radiation, and belongs to the field of communication. The sending method and the receiving method comprise that an orthogonal frequency division multiplexing (OFDM) subcarrier is divided into subcarrier pairs, each subcarrier pair comprises two adjacent OFDM subcarriers, and each OFDM subcarrier can be divided at most into one subcarrier pair; two complex weighting coefficients are used for mapping each constellation symbol contained in a to-be-sent data bit stream to two OFDM subcarriers contained in the subcarrier pair corresponding to each constellation symbol, and out-of-band radiation generated by the two OFDM subcarriers is offset; reversed fast Fourier transformation is carried out to the mapped to-be-sent data bit stream, and a cyclic prefix is inserted in the to-be-sent data bit stream to form an OFDM baseband signal which is sent then. The device comprises a dividing module, a mapping module and a modulation module. By means of the sending method, the receiving method and the device, operation complexity can be reduced.

Description

technical field [0001] The invention relates to the communication field, in particular to a transmitting method, a receiving method and a device for reducing out-of-band radiation. Background technique [0002] OFDM (Orthogonal Frequency-Division Multiplexing, Orthogonal Frequency Division Multiplexing) technology has the advantages of strong wireless channel frequency selective fading suppression capability and high spectral efficiency, and can be easily realized by fast Fourier transform, and is widely used in DAB (DigitalAudioBroadcasting, Digital Audio Broadcasting), WiMax (Worldwide Interoperability for Microwave Access), LTE (Long-Term Evolution, long-term evolution) and other wireless terrestrial broadcasting and cellular communication systems. [0003] However, OFDM technology has inherent disadvantages of strong out-of-band radiation, which will cause relatively large adjacent channel interference. Therefore, corresponding technical means are needed to reduce the im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26
Inventor 蒋伟肖峻峰
Owner HUAWEI TECH CO LTD
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