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Method for reducing OFDM signal frequency spectrum leakage

An orthogonal frequency division and spectrum leakage technology, applied in multi-frequency code systems, shaping networks in transmitter/receiver, baseband system components, etc. The effect of leakage is limited and cannot fully meet the actual needs, etc.

Active Publication Date: 2008-12-31
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

The AS method limits the interference of the cancellation signal to the data subcarrier of the OFDM symbol within an acceptable range, but its effect of eliminating spectrum leakage is limited, and it cannot meet the requirements of sharing or sharing between OFDM communication systems and other communication systems (including other OFDM communication systems). Spectrum Resource Needs
[0006] The above-mentioned various methods have limited effects on controlling the spectrum leakage of OFDM signals and cannot fully meet the actual needs

Method used

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  • Method for reducing OFDM signal frequency spectrum leakage
  • Method for reducing OFDM signal frequency spectrum leakage
  • Method for reducing OFDM signal frequency spectrum leakage

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Embodiment Construction

[0061] Below in conjunction with accompanying drawing and one group of specific parameter, the present invention is further described:

[0062] Parameter description: Suppose the target frequency band is 86Δf~88Δf. Spectrum sampling point of the target frequency band {f 1 ,..., f M} is 86Δf~88Δf, and the step size is 0.25Δf.

[0063] figure 1 Shown is the flow chart of the present invention: the i-th segment of input data is serial-to-parallel converted to obtain the frequency-domain sequence D of OFDM symbols i (k), 0≤k≤N-1, N=128, the target frequency band and its nearby subcarriers should be avoided during serial-to-parallel conversion, and the frequency domain sequence D of OFDM symbols i (k) Obtain the time-domain sequence d of OFDM symbols on N subcarriers whose adjacent frequency interval is Δf=4.125MHz by inverse discrete Fourier transform modulation i (n), 0≤n≤N-1, N=128, d i The duration of (n) is T=128ΔT,d i (n) After parallel-to-serial conversion and adding ...

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Abstract

The invention relates to a method which reduces the orthogonal frequency division multiplexing signal spectrum leakage, belongs to the technical field of wireless and wire communications using orthogonal frequency division multiplexing (OFDM) signals, and aims at having lower achievement complexity, causing only small inference to the data sub-carrier of the OFDM signals and effectively reducing the signal spectrum leakage. The input data of the invention can obtain a time-domain sequence si(n) of the OFDM signals through serial-parallel conversion, inverse discrete fourier transform and parallel-serial conversion, plus cyclic prefix and guard interval, and generate a time-domain sequence ci(n) of the optimal offset signals to the si(n), and then superimpose the ci(n) and the si(n) which are then transmitted by a transmitter. In order to reduce compute complexity and reduce the interference of the offset signals to the data sub-carrier in the si(n), two offset signal producing methods are provided; the method of the invention reduces the OFDM signal spectrum leakage, improves the spectrum resource utilization rate, and can also be applied to the communication system using the multi-carrier technology.

Description

technical field [0001] The invention belongs to the technical field of wireless and wired communication using Orthogonal Frequency Division Multiplexing (OFDM) signals, and specifically relates to a method for reducing frequency spectrum leakage of Orthogonal Frequency Division Multiplexing signals. Background technique [0002] With the continuous development of communication requirements and the increasingly scarce spectrum resources available for communication, how to improve the utilization efficiency of spectrum resources has become an important research issue. Orthogonal frequency division multiplexing (OFDM) is a communication modulation and multiplexing technology widely used in wireless and wired communication systems, but OFDM signals have large spectrum leakage, which will interfere with other communications operating at adjacent frequencies. The equipment forms a large interference, which is not conducive to the improvement of spectrum utilization efficiency. At...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/26H04L25/03
Inventor 屈代明王志强
Owner HUAZHONG UNIV OF SCI & TECH
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