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

A carrier modulation and multi-carrier technology, applied in the field of multi-carrier transmission based on selective carrier modulation, can solve the problem of high system energy consumption

Inactive Publication Date: 2012-08-15
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
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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 tradi

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

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Embodiment Construction

[0078] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0079] The main idea of ​​the present invention is: based on the control method of selective carrier modulation for energy-efficient multi-carrier transmission, the bit data to be transmitted is divided into two parts: a part of bit data is used to select some subcarriers in OFDM as empty carriers, and these subcarriers The carrier itself is not used and does not transmit any data information, so no transmission power is required; other bit data is modulated to the remaining sub-carriers, and these carriers require transmission power. The receiving end restores the first part of bit data according to the arrangement position of the empty carrier in the non-empty carrier, and demodulates the symbols on the remaining carriers to obtain the second part of bit data transmitted by the sending end, and then obtains all the bit data of the sending end....

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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....

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 赵慧赵龙郑侃王文博
Owner BEIJING UNIV OF POSTS & TELECOMM
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