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Method for enhancing receiving signal of China mobile multimedia broadcasting (CMMB) chip

A technology for receiving signals and chips, which is applied in the field of CMMB, can solve the problems of complex design and implementation, cost increase, etc., and achieve the effect of simple design and installation, easy implementation, and enhanced reception effect

Inactive Publication Date: 2012-06-13
BEIJING QIANTU FANGYUAN SOFTWARE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing scheme, although the design with the same effect can be achieved, the cost will increase greatly (because a CMMB chip needs to be added), and the design and implementation are more complicated (the interactive part of the 2 CMMB chips)

Method used

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  • Method for enhancing receiving signal of China mobile multimedia broadcasting (CMMB) chip
  • Method for enhancing receiving signal of China mobile multimedia broadcasting (CMMB) chip
  • Method for enhancing receiving signal of China mobile multimedia broadcasting (CMMB) chip

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Embodiment Construction

[0013] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] figure 1 It is a functional block diagram of the CMMB system based on dual antennas of the present invention; as figure 1 As shown, the CMMB chip connects two antennas and connects to the MCU microprocessor unit through the USB / SDIO / SPI interface. figure 2 Be the present invention to double-antenna receiving signal optimization processing flow chart; First, receive CMMB signal by double-antenna; Secondly, the Firmware in CMMB chip carries out optimization processing to CMMB signal; Then, the signal after optimization is delivered to by SPI / SDIO interface MCU; finally, present the optimized CMMB service to the terminal user.

[0015] The specific realization process that the present invention strengthens CMMB chip receivi...

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Abstract

The invention discloses a method for enhancing a receiving signal of a China mobile multimedia broadcasting (CMMB) chip. The method is characterized by comprising the following steps of: (1) selecting the CMMB chip capable of supporting two antennas; (2) connecting parallel routes with equal widths on a printed circuit board (PCB) with two radio frequency (RF) antennas on the CMMB chip to make the routes of the RF antennas as short as possible, and shielding by insulators to make impedance of each RF wire matched with the impedance of the antennas on the CMMB chip; (3) setting an effective distance of each antenna between 20 and 30 centimeters, and remotely arranging the two CMMB antennas; and (4) performing weighing combination on carrier signals transmitted by the two CMMB antennas by using a maximal-ratio combiner (MRC) method in firmware of the CMMB chip based on that noises of the carrier signals received by the two antennas are not associated with each other.

Description

technical field [0001] The invention relates to the technical field of CMMB, in particular to a method for enhancing a signal received by a CMMB chip based on dual antennas. Background technique [0002] The development of CMMB (China Mobile Multimedia Broadcasting) technology is changing with each passing day, and the application scenarios and requirements are gradually expanding and deepening. After breakthroughs in functions have been realized from scratch, users' requirements for performance have also gradually increased. Since the construction of the CMMB network is in a period of rapid development, the coverage area of ​​the CMMB network signal and the stability of the signal need to be further strengthened. When the user uses the CMMB terminal, the CMMB signal in the area is weak or unstable, or the terminal is at a high speed. When moving, the CMMB signal reception effect will not be very good, which will affect the user's experience of CMMB. Therefore, how to optim...

Claims

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Application Information

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IPC IPC(8): H04B1/18
Inventor 张希
Owner BEIJING QIANTU FANGYUAN SOFTWARE TECH
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