Method and device for transmitting and receiving wireless signal
A technology of wireless signal and transmission method, applied in the direction of signal channel, sustainable building, climate sustainability, etc., can solve the problems of noise enhancement effect, rough resource allocation, high power efficiency, achieve good power efficiency, avoid frequency offset Sensitivity, the effect of reducing the influence of the DC component
Active Publication Date: 2014-06-18
SPREADTRUM COMM (SHANGHAI) CO LTD
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[0007] In the prior art, there is also a technology called Single Carrier-Frequency Division Multiple Access (Single Carrier-Frequency Division Multiple Access, referred to as "SC-FDMA") , this technology only uses one carrier to achieve multi-carrier access by frequency division. Its advantages are low peak-to-average ratio, high power efficiency, and insensitivity to frequency offset. However, because only one carrier is used, the frequency domain Equalization has noise enhancement effect, resource allocation is too rough
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[0033] In order to make the purpose, technical solution and advantages of the present invention clearer, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.
[0034] Firstly, the way of dividing the system bandwidth in the embodiment of the present invention is explained. The system bandwidth is divided into multiple sub-bands, each sub-band is orthogonal to each other in the frequency domain, and each sub-band uses a single carrier to modulate data information.
[0035] figure 1 The schematic diagram of the transmission scheme of OFDM based on subband is given. In the figure, a three-way transmission path is taken as an example for illustration. Within the total bandwidth BW of the wireless channel, ten subbands are configured. The first transmission lane occupies four black subbands, the second transmission lane occupies three dark gray subbands, and the third transmission lane occupies ...
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The invention relates to the field of wireless communication and discloses a method and a device for transmitting and receiving wireless signal. The method and the device can realize better balance interms of power efficiency and system performance. In the invention, data information belonging to the same data stream is modulated to be in symbols of at least two subbands, wherein each subband und ergoes frequency domain orthogonality with other subbands, each subband is modulated through a single-carrier method, the symbol of each subband comprises a data information part and a protective circulatory prefix, each data information part comprises at least one piece of data information, wherein the data information part of at least one of the subbands comprises at least two pieces of data information, and the data information parts and the circulatory prefix parts among the subbands are respectively leveled with each other in time domains; and the subbands are mapped into an overall bandwidth of a wireless channel for emission together.
Description
technical field [0001] The invention relates to the field of wireless communication, in particular to a wireless transmission technology based on orthogonal frequency division. Background technique [0002] At present, wireless mobile communication systems are developing towards broadband and portability, and require high data bandwidth, low complexity, low battery power consumption, and high spectral efficiency for communication terminals. In order to meet this requirement, an Orthogonal Frequency Division Multiplexing ("OFDM" for short) technology has emerged. [0003] OFDM is a multi-carrier modulation (Multi-Carrier Modulation, referred to as "MCM"), which uses multiple carriers, decomposes the data stream to be transmitted into multiple low-speed bit streams, and uses these low-speed data streams to modulate multiple carrier. If these carriers are selected by frequency hopping, they can maintain mutually orthogonal waveforms even if the frequency spectrums alias with ...
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IPC IPC(8): H04L5/02H04L27/26
CPCY02B60/50
Inventor 张小东简相超吴涛陈垚
Owner SPREADTRUM COMM (SHANGHAI) CO LTD