Method and device for transmitting and receiving signals based on subbands

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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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 radio frequency (Radio Frequency, referred to as "RF") path of the transceiver, the digital analog converter of the transmitter (Digital Analog Converter, "DAC") and the analog digital converter of the receiver (Analog Digital Converter, referred to as "ADC") dynamic range, low power efficiency, sensitive to frequency offset

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