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CPM modulation multi-symbol detection

A multi-symbol detection and symbol technology, applied in the field of multi-symbol detection, can solve the problems of demodulation threshold effect and low power utilization rate, and achieve the effects of improving redundancy, reducing the amount of calculation, and reducing the amount of calculation.

Inactive Publication Date: 2011-08-17
CHONGQING JINMEI COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] With the continuous improvement of CPM modulation data transmission rate and operating distance, its demodulation threshold effect and low power utilization can no longer meet this growing demand, and its performance improvement is of great significance to the entire system

Method used

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  • CPM modulation multi-symbol detection
  • CPM modulation multi-symbol detection

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Embodiment Construction

[0104] In specific practice, the local likelihood detection sequence can be optimized to reduce the calculation amount of complex multiplication, which is beneficial to hardware implementation and enhances the applicability of patents. It is still assumed that N=5, M=2, h=0.7, and the operation is divided into the following steps, as described below.

[0105] step one:

[0106] Optimize the ergodic sequence coefficients of the block likelihood decoding of the above algorithm, C I =(C i，1 , C i，2 ......C i，N ) multiplied by the co-factor C i，3 * , has no effect on the likelihood detection results, the optimized group likelihood decoding traversal sequence C I =(C i，1 , C i，2 ......C i，N )It can be expressed as

[0107] C i , 1 = e jπh * [ Δ i 1 ...

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Abstract

The invention discloses a CPM modulation multi-symbol detection algorithm, wherein the implementation method comprises the following steps of: correlating all locally generated modulation sequences with received grouped data; and multiplying and accumulating through complex conjugate to get the maximal likelihood value; and determining the multi-symbol modulation information according to the local modulation sequence corresponding to the maximal likelihood value. The CPM modulation multi-symbol detection has the following beneficial and technological effects: the transmission speed is ensured to be greatly improved under the condition that the receiving antenna aperture and the launching power are unchanged; therefore, the cost is saved, the system performance is improved, the low complexity is realized, and the algorithm is beneficial to hardware realization.

Description

technical field [0001] The invention relates to a modulation system demodulation algorithm in the communication field, in particular to a multi-symbol detection of a CPM modulated signal. Background of the invention [0002] In the field of wireless communication, continuous phase frequency shift keying CPM modulation has constant envelope characteristics, anti-polarization and multipath fading, and anti-phase interference capabilities. At the same time, non-coherent reception can be used for reception, so it has been widely used. Typical applications include GSM , military radio, satellite communications and launch vehicle range telemetry, etc. [0003] Traditional CPM signal reception and demodulation adopts differential frequency discrimination method, which is characterized by the use of non-coherent demodulation technology, which does not require carrier tracking, demodulation processing is simple to implement, and the performance is somewhat worse than coherent demodul...

Claims

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Application Information

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IPC IPC(8): H04L27/20H04L25/03
Inventor 陶小鱼骆希
Owner CHONGQING JINMEI COMM