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Incoherent multiple-user detection method and device for non-orthogonal multi-pulse modulation

A multi-user detection, multi-pulse technology, applied in the transmitter/receiver shaping network, baseband system, digital transmission system, etc., can solve the problems of unsatisfactory detector performance, amplified noise power, and high computational complexity, Eliminate multiple access interference, improve detection performance, and reduce computational complexity

Active Publication Date: 2017-05-31
XIDIAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Although the computational complexity of the decorrelation and MMSE linear detectors is not high, the performance of the detector is not ideal due to the amplified noise power due to the inverse operation of the decorrelation matrix, and MMSE still has residual multiple access interference.
Therefore, some people have further studied a non-coherent decision feedback multi-user detector, which can greatly improve the detection performance of users with weaker power, but since the channel correlation matrix needs to be updated after the decision of each user , and its inverse operation, the computational complexity is very high
[0005] In summary, in the existing non-coherent multi-user detection methods of NMM systems, either the noise power is amplified, or there is still residual multiple access interference, or the detection performance is good, but its computational complexity is too high

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  • Incoherent multiple-user detection method and device for non-orthogonal multi-pulse modulation
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  • Incoherent multiple-user detection method and device for non-orthogonal multi-pulse modulation

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Embodiment 1

[0032] In the non-orthogonal multi-pulse modulation technology, since the transmitted signals of each user can be non-orthogonal and have unequal energy, multiple access interference will occur when superimposed to the receiving end. In the existing multi-user detection technology, although the non-coherent decorrelation detection completely eliminates the multiple access interference, it also amplifies the noise at the same time. Although the non-coherent MMSE detection minimizes the mean square error, there are still residual multiple access interference items. The performance of incoherent decision feedback can approach the single-user interface through iterative feedback between users, but its computational complexity is too high to be easy to realize. Aiming at various problems existing in the prior art, the present invention proposes a non-coherent multi-user detection method of non-orthogonal multi-pulse modulation. The present invention transforms the correlation matri...

Embodiment 2

[0055] The non-coherent multi-user detection method of non-orthogonal multi-pulse modulation is the same as embodiment 1, wherein the establishment of a pseudo-linear model of the received signal through non-orthogonal multi-pulse modulation described in step 1 specifically includes:

[0056] Step 1.1: Receive non-orthogonal multi-pulse modulated multi-user superposition signals, in which all K users transmit log by sending M non-orthogonal signals 2 After M-bit information passes through the additive Gaussian white noise channel, the superimposed signals of K users arrive at the receiver synchronously, and the received signal is expressed as:

[0057]

[0058] where z(t) is the unilateral power spectral density σ 2 noise, s kj (t),j∈{1,2,…,M} is expressed as the jth linearly independent waveform of user k with unit energy and equal probability transmission, E kj and φ kj represent the energy and phase of the jth signal of user k, respectively.

[0059] Step 1.2: Establ...

Embodiment 3

[0067] The non-coherent multi-user detection method of non-orthogonal multi-pulse modulation is the same as embodiment 1-2, wherein the matched filter bank described in step 2 is composed of MK filters that match all possible transmission signal waveforms of all users , the received signal passes through the matched filter, and the obtained MK-dimensional sufficient statistics are:

[0068] y=S H r=RAb+n

[0069] The sufficient statistic y is the output of the matched filter bank.

[0070] where R=S H S is an MK×MK order correlation matrix composed of signal waveforms, matrix A is a diagonal matrix composed of amplitude information of all users, vector b is an MK-dimensional column vector composed of symbol information of all users, and n is zero mean The covariance matrix of is σ 2 Gaussian random variables for R.

[0071] The difference between the present invention and the traditional CDMA system is that when the traditional CDMA system performs multi-user detection, a...

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Abstract

The invention discloses an incoherent multiple-user detection method and device for non-orthogonal multi-pulse modulation. The method comprises the steps of receiving multi-user overlapped signals through the non-orthogonal multi-pulse modulation; establishing a pseudo linear model for receiving signals; passing through a group of matching filters by the receiving signals to obtain a channel related matrix; carrying out QR decomposition on the related matrix and converting the related matrix into an upper triangular matrix structure; feeding back judged user information among users, thereby eliminating multi-access interference among the users; eliminating correlation of the signals of the users through decorrelation inversion operation; and carrying out maximum judgment on the detected signals and selecting the maximum from M possible results as judgment output. According to the method and the device, the detection performance of the users with relatively low power is greatly improved by feeding back the judgment signals of the users with relatively high power. The multi-access interference among the users is eliminated effectively through judgment feedback. Even if the interference users are many, the good stability can be still achieved. The method and the device are applied to the technical field of wireless communication.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to non-orthogonal multi-pulse modulation multi-user detection, in particular to a non-orthogonal multi-pulse modulation non-coherent multi-user detection method and device, which can be used to improve the detection of weaker power users performance, and even if the number of interfering users increases, the detection system can still have good stability. Background technique [0002] Non-orthogonal multipulse modulation (NMM) belongs to a nonlinear modulation technique. Since non-coherent detection is used at the receiving end, the phase information of the carrier is not required, which makes the detection device at the receiving end easier to implement. In the multi-user NMM system under the additive white Gaussian noise channel, each user transmits log by sending M possible signal waveforms respectively 2 M-bit information, and these signal waveforms c...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L25/02H04L25/03
CPCH04L1/0048H04L25/0246H04L25/03006
Inventor 王杰令周斌王敏王棚
Owner XIDIAN UNIV
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