Method and device for transmitting and receiving signals based on subbands

A signal receiving and sub-band technology, applied in the field of sub-band-based wireless communication technology, can solve the problems of low power efficiency, frequency offset sensitivity, transmission signal peak average, etc., and achieve the effect of reducing power consumption and saving costs

Active Publication Date: 2009-10-14
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

[0007] In addition, in the OFDM/OFDMA system, since each transmission link contains multiple subcarriers, without special restrictions on the allocation of subcarriers, the peak average of the transmitted signal is relatively high, which seriously affects the transmitter The efficiency of the power amplifier, as well as the

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  • Method and device for transmitting and receiving signals based on subbands
  • Method and device for transmitting and receiving signals based on subbands
  • Method and device for transmitting and receiving signals based on subbands

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Embodiment Construction

[0031] 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.

[0032] The basic principle of the present invention will be described first. figure 1 The schematic diagram of the subband-based wideband transmission and narrowband reception transmission scheme is given; figure 1 (a) The air signal transmitted to the radio frequency receiving unit of the receiver is given, in which the useful signal occupies multiple subbands, and the total bandwidth is BW; figure 1 (b) The pass-band, transition-band, and stop-band characteristics of an analog domain anti-aliasing filter or equivalent filter preceding the analog-to-digital converter (ADC) are given; note that the passband of the filter is BW, both sides of the passband are the transition band of the filter, and the unilateral bandwidth of the transiti...

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Abstract

The invention belongs to the field of wireless communication and discloses a method and a device for transmitting and receiving signals based on subbands. In the invention, by inhibiting signals outside an overall bandwidth of useful subcarrier waves and inside a transmission bandwidth of a sender before base-band processing, a receiver is not required to use the same bandwidth as the sender and can correctly receive the information to be transmitted by the sender to the receiver, thereby the demand on the processing capability of parts such as the radio frequency of the receiver, the analog-to-digital conversion, the baseband, and the like is lowered, the power consumption is reduced and the cost is saved. In addition, as the bandwidth of the subbands is wider than the bandwidth of the subcarrier waves, the subbands are less than the subcarrier waves and each subband is modulated by a single subcarrier wave, and the peak-to-average ratio of the signal transmission can be reduced.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to subband-based wireless communication technology. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM for short) is a multi-carrier modulation (Multi-Carrier Modulation, MCM for short) ), it uses multiple carriers, and decomposes the data stream to be transmitted into multiple low-speed bit streams, and uses these low-speed data streams to modulate multiple carriers. If these carriers are selected by frequency hopping, they can maintain mutually orthogonal waveforms even if the frequency spectrums alias with each other. In this way, the interference between signal waveforms is avoided, and the spectrum utilization rate is also improved. [0003] OFDM technology has been recognized as the preferred transmission technology for ultra-third-generation and fourth-band wireless broadband mobile communications. On the basis of OFDM technology, fr...

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Application Information

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IPC IPC(8): H04L27/26H04L5/02
CPCY02B60/50
Inventor 吴涛陈垚张小东简相超
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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