Roll-off factor selection method for pulse shaping filters in generalized frequency division multiplexing technology based on scanning and scaling
A generalized frequency division multiplexing and pulse shaping technology, which is applied in baseband systems, baseband system components, and shaping networks in transmitters/receivers. The effect of high quality of service
Active Publication Date: 2018-02-27
TIANJIN NORMAL UNIVERSITY
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At present, there is still a lack of simple and effective roll-off coefficient optimization options, and the functions of the GFDM system cannot be fully utilized in practical applications.
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[0023] A method for selecting a roll-off coefficient of a pulse-shaping filter in a generalized frequency-division multiplexing technology based on scanning and scaling, comprising the following steps:
[0024] Step 1: Configure the scanning and scaling method and the GFDM system. The specific configuration parameters are shown in Table 1. The feasible space of the roll-off coefficient α is Ω=[0, 1], and the maximum number of scanning layers is l max is 2, and the number of scanning samples per layer Ns is 11;
[0025] Table 1 embodiment parameter configuration
[0026] parameter
value
Feasible space Ω for roll-off coefficient α
[0，1]
The maximum number of scanning layers l max
2
Number of scan samples per layer Ns
11
Maximum number of iterations MFE
50
Modulation method μ
4(QAM)
pulse shaping filter
RRC or Xia1
Number of subcarriers K
64
Number of sub-symbols M
9
Cyclic pre...
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The invention discloses a roll-off factor selection method for pulse shaping filters in a generalized frequency division multiplexing technology based on scanning and scaling. According to scanning operation, a value range of a roll-off factor alpha is sampled and test evaluation is carried out on the pulse shaping filters corresponding to sample points. According to scaling operation, the alpha value range is reduced or amplified according to evaluation results of the sample points; it is assumed that alpha* expresses the optimum roll-off factor; if the reduced alpha value range at each timeis closure of the alpha*, the method is converged to a small neighborhood comprising the optimum solution; the smaller the neighborhood is, the lower the influence change of the roll-off factor in therange on the performance of a GFDM system is; when the neighborhood is small enough, the neighborhood is taken as the optimum solution; after the reduction operation is carried out, if an alternativeneighborhood does not comprise the alpha*, the method is converged after local optimization; and the movement and amplification between the neighborhoods can be realized through the amplification operation, so the method is finally converged to the alpha*. According to the method, the suitable roll-off factors can be selected for different pulse shaping filters, thereby achieving a relatively lowsymbol error rate.
Description
technical field [0001] The invention belongs to the technical field of generalized frequency division multiplexing, and in particular relates to a method for selecting a roll-off coefficient of a pulse shaping filter in the generalized frequency division multiplexing technology based on scanning and zooming. Background technique [0002] Wireless communication is moving towards the fifth generation of mobile communication technology (5G). Many countries have set up 5G technology promotion groups to conduct research and development of next-generation communication technologies and standards, striving to achieve faster, more convenient and more stable service quality. Generalized Frequency Division Multiplexing (GFDM) is one of the multi-carrier alternatives for 5G. Compared with Orthogonal Frequency Division Multiplexing (OFDM), it has high spectral efficiency, less out-of-band power leakage, and no synchronization of subcarriers. advantage. [0003] In GFDM, the transmitted...
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IPC IPC(8): H04L25/03G06F17/50
CPCG06F30/20H04L25/03828
Inventor 张秀张新
Owner TIANJIN NORMAL UNIVERSITY