Multi-carrier transmission method and device based on selected carrier modulation

Abstract

The invention relates to a multi-carrier transmission method and a multi-carrier transmission device based on selected carrier modulation. The multi-carrier transmission method comprises the steps that a transmitting end groups sub-carriers in an orthogonal frequency division multiplexing (OFDM) system and correspondingly groups bit data to be transmitted, after grouping, one part of bit data in each group of data selects n-k sub-carriers from n sub-carriers of each group as virtual carriers, the other part of bit data is modulated into k symbols which are mapped to the remaining k sub-carriers, and virtual carriers and the carriers which carry the data form OFDM symbols and then are transmitted; and a receiving end groups balanced receiving frequency domain symbols in a way as the same as the grouping way of the transmitting end, virtual carrier position identification is conducted in each group of symbols, virtual carrier positions are mapped to be bits to obtain the first part of data , virtual carrier position symbols in each group are removed and the remaining k symbols are demodulated to obtain the second part of data. The multi-carrier transmission method and the multi-carrier transmission device based on the selected carrier modulation solve the problem that the energy consumption of the traditional OFDM system is high in order to obtain more information under the situation that the bandwidth and the noise power of the system are determined.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a method and device for multi-carrier transmission based on selective carrier modulation. Background technique [0002] OFDM (Orthogonal Frequency Division Multiplexing) is a multi-carrier transmission method in which subcarriers overlap each other in the frequency domain but maintain orthogonality. Its advantages are: (1) Since there is 1 / 2 overlap between adjacent subcarriers, when the number of subcarriers is large enough, the spectrum utilization rate is very high; (2) After OFDM converts high-speed data streams into serial and parallel, The length of the data symbol on each subcarrier becomes N times of the original, so it can suppress the intersymbol interference caused by the delay spread; (3) usually add a guard interval before the OFDM symbol, as long as the guard interval is greater than the channel delay spread It can completely cancel the multipath interference....

AI Technical Summary

Problems solved by technology

[0014] The technical problem to be solved by the present invention is to provide a method and device for multi-carrier transmission based on selective carrier modulation, so as to solve the problem that in a traditional OFDM system, in order to obtain more information, the bandwidth and noise power must be greatly increased. The transmission power of the system leads to the problem of high energy consumption of the system

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