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Multiplexing orthogonal prolate spheroidal wave function pulse-modulated signal demodulation method

A technology of pulse modulation signal and demodulation method, applied in the direction of multi-frequency code system, etc., can solve the problems of instability, unusability, fluctuation of demodulation performance, etc.

Inactive Publication Date: 2014-10-15
王红星
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the system adopts the demodulation method of matched filtering, due to the non-strict orthogonality between pulses and the cross-correlation value between PSWF pulses presents an oscillation amplitude, the demodulation performance of the system also presents an unstable state of oscillation fluctuations. Make the demodulation performance of the system drop rapidly, even unusable
It can be seen that maintaining the strict orthogonality of the pulse group in the time domain is the guarantee and prerequisite for the system to achieve better demodulation. However, the non-strict orthogonality of the pulse group at the receiving end becomes an obstacle that restricts the improvement of system performance.

Method used

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  • Multiplexing orthogonal prolate spheroidal wave function pulse-modulated signal demodulation method
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  • Multiplexing orthogonal prolate spheroidal wave function pulse-modulated signal demodulation method

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Effect test

Embodiment 1

[0135] Using 2 or 4 orthogonal PSWF pulses as the modulation waveform, setting the pulse group to produce different delays after passing through the channel, resulting in the destruction of the orthogonality of the pulse group, and using decorrelation and matched filtering methods for demodulation, respectively, The BER performance of the system is as Figure 6 shown.

[0136] Figure 6 Among them, "MF" means matched filter demodulation, "Dec" means decorrelation demodulation, and "delay=x%" means that the second pulse is delayed by x% symbol periods relative to the first pulse. Figure 6 "delay=[x, y, z]" in (b) means that the 2nd, 3rd, and 4th pulses are respectively delayed by x%, y%, and z% symbol periods relative to the first pulse. The analysis shows that when the signal-to-noise ratio is low, the performance of the decorrelation detection method is similar to that of the matched filter. With the increase of the signal-to-noise ratio, the advantages of the decorrelatio...

Embodiment 2

[0138] Under different pulse delay conditions, four orthogonal PSWF modulation waveforms are demodulated by using matched filter method, decorrelation detection method and MMSE demodulation method respectively. It is set that the pulse group produces different delays after passing through the channel, which leads to the destruction of the orthogonality of the pulse group, and the result is as follows Figure 7 shown.

[0139] Figure 7 Among them, "MF" means matched filter demodulation, "Dec" means decorrelation demodulation, "MMSE" means MMSE demodulation, "delay=x%" means that the second pulse is delayed relative to the first pulse x% symbol periods. Figure 7 "delay=[x, y, z]" in (b) means that the 2nd, 3rd, and 4th pulses are respectively delayed by x%, y%, and z% symbol periods relative to the first pulse. At "delay=[0.4,1.6,1.6]", MMSE detection at BER=10 -4 Eb / N required for 0 About 4dB lower than traditional matched filter demodulation.

[0140] When there is no ...

Embodiment 3

[0142] Under different pulse delay conditions, assuming that each pulse is of equal amplitude, three methods of matched filtering, decorrelation and whitening transform decorrelation are used for demodulation. Figure 8 It is the demodulation bit error rate diagram in the case of 2 pulses. Figure 9 It is the demodulation bit error rate diagram in the case of 4 pulses.

[0143] Figure 8 In (a), the performance comparison of the three demodulation methods when the second pulse is delayed by 0%, 0.4%, and 0.8% relative to the first pulse. From Figure 8 It can be seen from (a) that for different pulse delays, the whitening transform decorrelation detection method is better than the matched filter detection method, and has advantages over the traditional decorrelation detection method in the case of small signal-to-noise ratio. Figure 8 (b) is a partial enlarged picture of the small SNR interval. It can be seen from the figure that in the case of small SNR, the performance o...

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Abstract

The invention discloses a multiplexing orthogonal PSWF (Prolate Spheroidal Wave Function) pulse-modulated signal demodulation method. The method comprises the following steps: performing matched filtering processing on received signals to obtain output signals; sequencing the received signals from high power to low power according to the magnitude of output energy after matched filtering, wherein the first signal is a highest-amplitude signal while the last signal is a lowest-amplitude signal; detecting the energy difference among each pulse, adopting a whitening detection method based on successive interference cancellation if the energy difference is large, and adopting a decorrelation detection method if the energy difference is small.

Description

technical field [0001] The invention relates to a demodulation method in radio communication, in particular to a demodulation method of multi-channel orthogonal pulse modulation signals. Background technique [0002] Multi-carrier modulation represented by Orthogonal Frequency-Division Multiplexing (OFDM) uses multiple mutually orthogonal modulation signals to transmit information at the same time, which can effectively improve the effectiveness of the communication system. The non-sinusoidal time-domain quadrature modulation method uses multi-channel ellipsoidal wave function (Prolate Spheroidal Wave Functions, referred to as PSWF) pulse groups that are orthogonal in time domain and overlapped in spectrum to transmit information, and demodulate information by using the orthogonality between pulse groups , has the advantages of high spectrum utilization and high power utilization (patent: Wang Hongxing, Zhao Zhiyong, Liu Xiguo, Mao Zhongyang, Zhang Lei, Shu Genchun, quadratu...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 王红星张磊陈昭男刘传辉
Owner 王红星
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