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gfdm system mmse receiving method and device suitable for fsc

A receiving method and technology of a receiving device are applied in the field of MMSE receiving method and device in a GFDM system, and can solve problems such as inapplicability of the AWGN channel model.

Active Publication Date: 2020-06-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, existing low-complexity receiver design schemes (such as receivers based on Gabor transform [15] and a two-step MMSE receiver [11] ) only considers the most ideal situation, assuming that the channel is an Additive White Gaussian Noise (AWGN) channel, and the channel impulse response is a unit impulse
Obviously, in practical situations, the channel is random and time-varying, and the AWGN channel model is not applicable

Method used

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  • gfdm system mmse receiving method and device suitable for fsc

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of GFDM system MMSE receiving method suitable for FSC, the method comprises the following steps:

[0041] 101: Using the sparsity and repeatability of the channel matrix and combining the transmit matrix, calculate the conjugate transpose matrix of the product of the channel matrix and the transmit matrix;

[0042] That is, the noise variance of the receiver is obtained by channel estimation and the channel matrix H of FSC, and then use the sparsity and repetition of the channel matrix to efficiently calculate the matrix B=(HA) * , where A is the GFDM transmit matrix, (·) * Represents the conjugate transpose.

[0043] 102: According to the quasi-tridiagonal arrangement structure of the expected matrix, the symmetric property about the diagonal, and the conjugate symmetric property about the inverse subdiagonal, combined with the conjugate transpose matrix, calculate the element values ​​of each area of ​​the expected matrix successively;

[0044] That is, fir...

Embodiment 2

[0052] The scheme in embodiment 1 is further introduced below in conjunction with specific calculation formulas and examples, see the following description for details:

[0053] 1. GFDM system model

[0054] 1. Transmitter model

[0055] Assume that the GFDM system model contains K subcarriers and M subsymbols. Such as figure 1 As shown, the binary source signal b of length N=KM is mapped to a QAM constellation to generate a complex sequence d of length N. After serial-to-parallel conversion, the complex sequence d is divided into K segments of length M where d k is the constellation point modulated onto the kth subcarrier, k is the subcarrier label, d k =[d k (0),...,d k (M-1)] T , d k (0),...,d k (M-1) is the M constellation points modulated onto the kth subcarrier, (·) T for the transpose. Then, each d k Do K-point upsampling to generate an upsampling sequence of length N Can be expressed as:

[0056]

[0057] Among them, δ(n) represents the unit impulse...

Embodiment 3

[0219] Below in conjunction with concrete experiment, the scheme in embodiment 1 and 2 is carried out feasibility verification, see the following description for details:

[0220] In this embodiment, the BER performance comparison between the original MMSE under the FSC and the MMSE receiving method proposed in the embodiment of the present invention is realized through experimental simulation. The FSC impulse response chosen for the experiment is Other parameters required for the experiment are shown in Table 2.

[0221] Table 2 Experimental parameter settings

[0222]

[0223] In this experiment, take E b / N 0 The range is [0,28]dB, for each E b / N 0 Point, conduct 1000 Monte-carlo simulations, each simulation uses 10 GFDM symbols. Figure 9 The BER performance curves of the two receivers are given. It can be seen from the figure that the BER curves of the two receivers are consistent, indicating that the low-complexity MMSE receiver proposed in the embodiment of ...

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Abstract

The invention discloses an efficient MMSE (Minimum Mean Square Error) receiving method and device of a GFDM (Generalized Frequency Division Multiplexing) system applicable to an FSC (Frequency Selective Channel). The efficient MMSE receiving method comprises the steps of calculating a conjugate transpose matrix of the product of a channel matrix and an emission matrix by using the sparsity and therepeatability of the channel matrix and combining the emission matrix; successively calculating element values of each region of an expected matrix by combining the conjugate transpose matrix according to a quasi-tridiagonal arrangement structure, a property of being symmetric about a diagonal and a property of being conjugate symmetric about a reverse secondary diagonal of an expected matrix; calculating an inverse matrix of the expected matrix; calculating an output signal according to the inverse matrix, the conjugate transpose matrix and a received signal, and de-mapping the output signalthrough QAM to obtain a binary symbol which is the finally acquired received information. The efficient MMSE receiving device comprises a GFDM transmitting module, a frequency selective channel and an MMSE receiving module. The efficient MMSE receiving method and device take channel fading conditions into consideration, conform to the actual demand, and achieve low-complexity MMSE reception of the GFDM system in the frequency selective channel.

Description

technical field [0001] The invention relates to the field of multi-carrier modulation and demodulation system, channel analysis and receiver design, in particular to a GFDM system MMSE receiving method and device suitable for FSC. Background technique [0002] In the future, wireless mobile communication is developing towards high transmission rate, high spectrum efficiency, low delay and flexible bandwidth reuse. The modulation method based on multi-carrier can realize high-speed transmission at the physical layer. Among them, as the mainstream modulation method, Orthogonal Frequency Division Multiplexing (OFDM) has been widely used in power systems (such as power line communication [1] ) and wireless communication systems (such as wireless local area network [2] , the fourth generation mobile communication network [3] ). Compared with traditional single-carrier modulation technology, OFDM spectrum utilization efficiency is higher. However, the next-generation mobile co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L27/38H04L25/02
CPCH04L25/025H04L27/2691H04L27/2695H04L27/38
Inventor 黄翔东黎鸣诗马欣
Owner TIANJIN UNIV
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