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Diversity reception method for simulcasting system

A technology of diversity reception and receiving antennas, which is applied in the field of communication, can solve problems such as co-channel interference, achieve the effects of improving fading characteristics, improving the quality of uplink signals, and improving the quality of received signals

Active Publication Date: 2013-12-18
HARBIN HYTERA TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if multiple channel machines are simply installed in order to achieve the purpose of the simulcast system, then the overlapping area between each channel machine will inevitably produce co-channel interference

Method used

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  • Diversity reception method for simulcasting system
  • Diversity reception method for simulcasting system
  • Diversity reception method for simulcasting system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Combining Figure 1-Figure 5 , a method for diversity reception of a simulcast system of the present invention, the specific steps are as follows:

[0023] Step 1. Redo the functional division of the simulcast base station and simulcast center:

[0024] (1) Simulcast base station

[0025] The main modules included in the simulcast base station are: antenna, feeder, GPS processing unit, radio frequency processing unit, digital processing unit, controller; the receiving antenna and feeder are used to receive the uplink signal from the mobile station and transmit the downlink signal from the simulcast center ;The GPS processing unit is used for clock calibration and synchronization; the radio frequency processing unit consists of two parts: one is the radio frequency receiving unit, which performs down-conversion and filtering processing on the received radio frequency signal, and processes the radio frequency signal into an intermediate frequency signal; the o...

Embodiment 2

[0030] Example 2: Combining figure 1 , the present invention is a new architecture of the simulcast system, which is obviously different from other architectures. This architecture simplifies the data processing work at the base station, and transfers some functions of uplink data processing to the simulcast center.

[0031] The new architecture of the simulcast system proposed by the present invention is specifically described as follows:

[0032] Explanation 1. The downlink processing module includes digital modulation and radio frequency transmission unit. The modulation unit will modulate and transmit the data received by the controller from the simulcast center. However, the uplink processing module does not include a digital demodulation unit, only a radio frequency receiving unit and a digital down-conversion unit. The digital down-conversion will perform down-conversion and filtering to obtain an intermediate frequency digital signal, and then send the data to the sim...

Embodiment 3

[0035] Example 3: Binding Figure 3-Figure 5 , image 3 It is a flow chart of the uplink signal processing of the simulcast base station in the present invention, and the uplink signal processing of the simulcast base station includes three parts: radio frequency reception, analog-to-digital conversion, and digital processing. Specifically, the radio frequency receiving part includes the sampling of the signal field strength value, and also includes analog down-conversion and filtering processing to convert the radio frequency signal into an intermediate frequency signal; while the digital processing part includes digital down-conversion and filtering processing to convert the intermediate frequency signal into a Low-rate digital intermediate frequency signal; in addition, the digital processing part will also convert the signal field strength value into a digital signal. Finally, the digital intermediate frequency signal and its field strength value are sent to the simulcast c...

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Abstract

The invention provides a diversity reception method for a simulcasting system. By the method, the level of a receiving signal is increased, the uplink signal quality of the simulcasting system is improved and the communication quality of the simulcasting system is optimized. The method comprises the following steps of: performing functional partitioning on a simulcasting base station and a simulcasting center again; and modifying a decision method for uplink signal processing from static decision or dynamic decision to diversity reception, wherein the simulcasting base station comprises an antenna, feeder line, a global positioning system (GPS) processing unit, a radio frequency processing unit, a digital processing unit and a controller; and the simulcasting center comprises the controller, a diversity combination unit, a demodulation unit, a coding and decoding unit and a high layer protocol stack processing unit. By the simulcasting decision scheme provided by the invention, the level of a receiving signal is increased, and the fading characteristics of the signal are improved; and the architecture of the simulcasting system simplifies the functions of the base station, and the physical layer and data link layer functions of the simulcasting base station are partially processed by the simulcasting center, thereby fulfilling the aim of supporting the diversity reception method.

Description

technical field [0001] The invention relates to communication technology, specifically a method for diversity reception of a simulcast system. Background technique [0002] The simulcasting system is to establish multiple co-frequency channel machines in an area, and each channel machine is responsible for a certain range of coverage, so that a large-scale simulcast coverage can be achieved by using multiple co-frequency channel machines and link connections. However, if simply installing multiple channel machines in order to achieve the purpose of the simulcast system, then the overlapping area between each channel machine will definitely produce co-channel interference. Introducing the GPS second clock as the system's reference clock source, using GPS frequency locking and related data synchronization technology, the simulcast system overcomes the problem of co-frequency interference of downlink signals in the overlapping area of ​​traditional conventional simulcast system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/08H04B7/26
Inventor 常培峰王可马超孙鹏飞
Owner HARBIN HYTERA TECH CORP
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