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Multiuser detector based on iterative message transfer algorithm

A message passing algorithm and multi-user technology, which is applied in the field of multi-user detectors based on iterative message passing algorithm, can solve the problems of inability to eliminate sky wave interference and large interference between sky waves and ground waves, and achieve fast acquisition and multi-access interference elimination. , the effect of reducing the amount of storage and the delay of small data

Inactive Publication Date: 2008-07-09
HARBIN ENG UNIV
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Problems solved by technology

[0087] In order to solve the problem that the sky wave interferes greatly with the ground wave in the marine radio navigation system, and the traditional method cannot eliminate the sky wave interference, the present invention proposes a multi-user detector based on an iterative message passing algorithm

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specific Embodiment approach 1

[0101] Embodiment 1: The multi-user detector based on the iterative message passing algorithm of this embodiment includes: a demodulation device 20 for demodulating the received signal and then obtaining the demodulated signal, A for multi-channel signal Parallel signal capture and reconstruction devices 10 for capture, tracking and signal reconstruction. The A parallel signal capture and reconstruction devices 10 are divided into one stage, two stages... until the last stage according to the power from large to small, and one of them is The parallel signal acquisition and reconstruction devices 10 from level A to level A-1 have the same structure, and are all composed of b signal acquisition and reconstruction modules 11 and an interference elimination module, and the interference elimination module captures and reconstructs b signals After subtracting the superposition sum of the output signals of the construction module 11 from the input signal of the parallel signal capture...

specific Embodiment approach 2

[0110] Specific Implementation Mode 2: Refer to FIG. 7 to illustrate this implementation mode. The multi-user detector based on the iterative message passing algorithm described in this embodiment includes two stages of parallel signal capture and reconstruction devices 10, each stage of parallel signal capture and reconstruction devices has three signals, and one stage of parallel signal capture and reconstruction devices It is used to capture and reconstruct ground wave signals with relatively large power, and the final parallel signal capture and reconstruction device is used to capture and reconstruct ground wave signals with relatively small power.

[0111] The radio signal is divided into two groups according to the power, the sky wave with higher power is divided into one group, the ground wave with lower power is divided into one group, each group has N signals, and the N signals in each group are canceled by parallel interference In the first group, the sky-wave signa...

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Abstract

A multiuser detector based on iterative message passing algorithm relates to a rapid pseudo code acquisition method and a multiuser detector in marine radio navigation system, which solves the problems of serious sky-wave interference in the marine radio navigation system and difficulty in eliminating the sky-wave interference by conventional method. The detector comprises an interference cancellation structure with serial-parallel sub-groups, wherein signals are divided into a plurality of groups according to power, a parallel interference cancellation structure is adopted within each group, and a serial interference cancellation structure is adopted between the groups. Based on IMPA algorithm, the invention can acquire pseudo codes, which comprises the following steps: representing the constraint relationship of the pseudo code sequence by a factor graph, carrying out soft message iterative computation to obtain maximum a-posteriori estimation and generating a local sequence according to the maximum a-posteriori estimation and the decision condition. The invention shortens the acquisition time of long pseudo codes and effectively improves the acquisition probability, and can be applied in signal detection of satellite navigation, 4D mobile communication system, ultra-wide band system, etc.

Description

technical field [0001] The present invention relates to a pseudo code fast acquisition method and a multi-user detector in a marine radio navigation system. Background technique [0002] The medium and short wave bands have the characteristics of long propagation distance at sea and stable ground wave propagation, and are widely used in the field of navigation. The marine radio navigation system uses direct ground wave signals for maritime navigation and positioning. The receiver captures the ground wave signals of N (N≥3) navigation stations, measures the pseudo-range between the receiver carrier and the navigation stations, and determines the position of the carrier through positioning calculation. In the medium and short wave bands, the signal transmitted by the navigation station reaches the receiver through two paths: one is the ground wave propagating along the ground surface; the other is the sky wave that reaches the receiver after one or more reflections from the i...

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Application Information

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IPC IPC(8): G01S5/12G01S1/04
Inventor 王伟郝燕玲徐定杰韦金辰沈锋黄平薛冰
Owner HARBIN ENG UNIV
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