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A demodulation method and demodulation system for spectrum domain communication signals

A communication signal and demodulation system technology, applied in the direction of modulated carrier system, transmission system, multi-frequency code system, etc., can solve the problem of difficult application of signal detection or demodulation, high computational complexity, and inability to meet the requirements of spectral domain communication signal demodulation performance requirements, etc.

Inactive Publication Date: 2016-08-03
SHANGHAI RES CENT FOR WIRELESS COMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the existing cyclic feature detection algorithm, the simplified suboptimal algorithm is often used, the detection performance is not high, and it cannot meet the requirements of the spectral domain communication signal demodulation performance of the spectral domain channel multiplexing transmission system based on cyclic delay modulation
The original optimized detection algorithm has high computational complexity and is difficult to apply to actual signal detection or demodulation

Method used

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  • A demodulation method and demodulation system for spectrum domain communication signals
  • A demodulation method and demodulation system for spectrum domain communication signals
  • A demodulation method and demodulation system for spectrum domain communication signals

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Embodiment

[0048] This embodiment provides a demodulation method and demodulation system for a spectrum domain communication signal. The detailed process of the demodulation method is as follows:

[0049] 1) First, according to a received continuous CDM-OFDM cyclic delay modulation signal, calculate the estimated value of the corresponding cyclic autocorrelation function. The detailed calculation process is as follows:

[0050] The continuous CDM-OFDM cyclic delay modulation signal can be expressed as:

[0051] s n T ( n ) = 1 N T N Σ l = - ∞ + ∞ g ( n - ...

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Abstract

The invention discloses a demodulation method and a demodulation system of a spectrum domain communication signal. The method includes: step 1, the cyclic autocorrelation function estimation value processing unit receives a continuous CDM-OFDM period whose length is one OFDM period The cyclic delay modulates the signal, and calculates the estimated value of the corresponding cyclic autocorrelation function; step 2, the cyclic delay detection processing unit calculates the corresponding likelihood functions for different cyclic delay values, and obtains the corresponding cyclic delay vector; step 3, the cyclic modulation vector demapping processing unit maps the cyclic delay vector to obtain the transmitted cyclic modulation signal. The present invention can be applied to spectral domain channel multiplexing transmission, increases system capacity without affecting ordinary OFDM signal transmission; adopts a block calculation method, greatly reduces calculation complexity, and saves processing time and resources.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a demodulation method and a demodulation system of a spectrum domain communication signal. Background technique [0002] As a standard multi-antenna diversity technology with good compatibility, cyclic delay diversity (Cyclic Delay Diversity, CDD) has greatly enhanced the existing standard orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) technology. Enough space diversity gain can be obtained in the wireless environment. Cyclic delay processing can convert space diversity into frequency diversity, thus adding redundancy in the frequency domain of OFDM systems. Different from Space-Time Block Coding (STBC) and Space-Time Interleaved Coding (Space-Time TrellisCodes, STTC) technologies, the cyclic delay diversity technology can only be realized at the sending end, and the system using this enhanced technology maintains Compatibility...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04L25/02
CPCH04L27/2647H04L27/2607H04L27/2678
Inventor 蒋永磊郭海友田金凤陈华厦胡宏林杨旸
Owner SHANGHAI RES CENT FOR WIRELESS COMM
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