WO2012129855A1 - 一种手持式终端内置cmmb天线的方法及其装置 - Google Patents
一种手持式终端内置cmmb天线的方法及其装置 Download PDFInfo
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- WO2012129855A1 WO2012129855A1 PCT/CN2011/076113 CN2011076113W WO2012129855A1 WO 2012129855 A1 WO2012129855 A1 WO 2012129855A1 CN 2011076113 W CN2011076113 W CN 2011076113W WO 2012129855 A1 WO2012129855 A1 WO 2012129855A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/26—Arrangements for switching distribution systems
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- the present invention relates to a method and apparatus for a built-in antenna of a CMMB (China Mobile Multimedia Broadcasting) antenna built in a terminal, and is particularly suitable for a built-in antenna for improving the receiving effect of a handheld terminal CMMB. Background technique
- CMMB China Mobile Multimedia Broadcasting
- CMMB is mainly for small-screen handheld devices. Its terminal products mainly include MP4, mobile phones, GPS, USB receivers, independent receivers, etc., providing digital broadcast TV programs, integrated information and emergency broadcast services, enabling satellite transmission and terrestrial networks. A seamless collaborative coverage.
- CMMB uses mobile multimedia broadcast TV technology with independent intellectual property rights. The system is operational, maintainable and manageable. It has broadcast and two-way service functions, supports a central and local operating system, and has a cryptographic authorization control management system. Support unified standards and unified operations, and support users to roam nationwide.
- the TV antennas of CMMB handheld devices are realized by external rod antennas.
- the rod antennas are expensive due to their high price, unsightly appearance and external damage, so the importance of the built-in CMMB antenna scheme is constantly increasing.
- the CMMB terrestrial base station U-band requires a frequency range of 474-798 Mhz
- the required size of the CMMB internal antenna is difficult to meet the requirements of this frequency band, and the built-in antenna receiving capability is far weaker than the external antenna.
- the 480-562Mhz frequency range of the lower frequency band of CMMB has always been a difficult point in antenna design. Even a whip antenna is difficult to achieve a satisfactory receiving index in this frequency band.
- the main object of the present invention is to provide a method and a device for the built-in terminal built-in CMMB antenna, so as to improve the sensitivity of the received signal and improve the television receiving effect of the CMMB handheld device.
- a method for a built-in terminal to have a CMMB antenna comprising:
- the frequency band range of the CMMB applicable band is divided into at least the first frequency band and the second frequency band; the first radio frequency signal that is output from the built-in antenna and falls into the first frequency band is transmitted to the CMMB chip via the first RF branch; The output second radio frequency signal falling in the second frequency band is transmitted to the CMMB chip via the second radio frequency branch;
- the CMMB chip determines a signal quality indicator of the first radio frequency signal output by the first radio frequency branch and the second radio frequency signal output by the second radio frequency branch, and selects the first radio frequency signal and the second radio frequency The signal quality indicator in the signal satisfies the expected RF signal.
- the method when performing the determining, the method further includes:
- the method further includes: demodulating and decoding the radio frequency signal.
- the signal quality indicator includes one or a group of power strength, signal to noise ratio, and bit error rate values. Hehe.
- the first RF branch is a high frequency band RF branch including a double L matching network and a band pass filter.
- the second radio frequency branch is a low-band radio frequency branch including a first dual L matching network, an LNA circuit, a second dual L matching network, and a band pass filter.
- a handheld terminal with a built-in CMMB antenna including an internal antenna and a CMMB chip, also including:
- a first RF branch for transmitting a first RF signal of the built-in antenna output falling into the first frequency band of the CMMB applicable band to the CMMB chip;
- a second RF branch for transmitting a second RF signal of the internal antenna output falling into the second frequency band of the CMMB applicable band to the CMMB chip;
- the CMMB chip is configured to determine a signal quality indicator of a first radio frequency signal output by the first radio frequency branch and a second radio frequency signal output by the second radio frequency branch, and select the first radio frequency signal and The signal quality indicator in the second RF signal satisfies an expected RF signal.
- the CMMB chip includes:
- a first tuner for receiving and tuning a first radio frequency signal output by the first radio frequency branch
- a second tuner for receiving and tuning a second radio frequency signal output by the second radio frequency branch
- a module configured to respectively receive a first radio frequency signal and a second radio frequency signal tuned via the first tuner and the second tuner, and maintain a first radio frequency signal and a second radio frequency after obtaining a signal quality indicator The signal quality indicator in the signal satisfies the expected reception of an RF signal;
- the signal quality indicator determining module is configured to perform quality indicator judgment on the first radio frequency signal or the second radio frequency signal in sequence, and sequentially feed the judgment result to the switch control module.
- the first RF branch is a high-band RF branch, and includes:
- a dual L matching network the input end of which is connected to the built-in antenna output end; a bandpass filter having an input coupled to the output of the dual L matching network;
- the output of the band pass filter is coupled to the input of the first tuner of the CMMB chip as a high frequency tuner.
- the second RF branch is a low-band RF branch, and includes:
- An LNA circuit having an input connected to an output of the first dual L matching network; a second dual L matching network having an input coupled to an output of the LNA circuit; a band pass filter having an input coupled to the first An output of the two-pair L matching network; wherein an output of the band pass filter is coupled to an input of a second tuner of the CMMB chip as a low frequency tuner.
- the signals of different bands are transmitted through different RF branches, and judge through the chip, select the RF branch transmission signal that meets the requirements, so that the CMMB antenna is more miniaturized and compensated.
- the problem that the CMMB antenna has a demanding antenna space requirement due to the working frequency band solves the problem that the handheld terminal always uses the whip antenna to receive the CMMB television signal, which facilitates the flexible application of the mobile phone and the small terminal.
- the RF end of the CMMB chip is provided with a tuner that receives the RF branch of different frequency bands. After different tuning processes, the quality index of the signal is judged, and then the judgment result is fed back to the switch control module of the control RF branch.
- the chip is simple. After the upgrade plan, the above functions can be realized to meet and guarantee the receiving performance of the CMMB full-band. The solution is simple to implement and easy to promote.
- 1 is a flow chart of a method for a built-in CMMB antenna of a handheld terminal of the present invention
- 2 is a block diagram showing the internal structure of a CMMB chip in the present invention
- FIG. 3 is a block diagram of a high frequency band RF branch connection in the present invention.
- FIG. 4 is a block diagram of a low frequency band RF branch connection in the present invention.
- FIG. 5 is a block diagram showing the overall connection of the present invention.
- FIG. 6 is a block diagram of the workflow of the present invention. detailed description
- the invention provides a method for a built-in terminal built-in CMMB antenna, and a flow chart thereof is shown in FIG. 1 and includes:
- the frequency band range of the CMMB applicable band is divided into at least the first frequency band and the second frequency band;
- the CMMB chip determines a signal quality indicator of the first radio frequency signal output by the first radio frequency branch and the second radio frequency signal output by the second radio frequency branch, and selects the first radio frequency signal and the first The signal quality indicator in the two RF signals satisfies the expected one RF signal and discards the other RF signal.
- the division of the CMMB band is generally based on the U-band requirement range of the CMMB ground station, the range of 474-798Mhz, and is divided into two bands, and the RF branch is set according to the two bands, and the RF branch is designed according to the requirements of the 562-798Mhz band. All the way to design the RF branch according to the requirements of 474-562Mhz frequency band; It can also be designed into three or more RF branches according to the technical requirements of the handheld terminal.
- the setting structure is basically the same as the high-band RF branch or low-band RF branch in the present invention. The same, will not be described here. As shown in FIG.
- a block diagram of an internal structure of a CMMB chip in the present invention includes: a first tuner for receiving and tuning a first radio frequency signal output by the first radio frequency branch; and a second tuner for Receiving and tuning a second radio frequency signal output by the second radio frequency branch; a switch control module, configured to respectively receive a first radio frequency signal and a second radio frequency signal tuned via the first tuner and the second tuner And after receiving the signal quality indicator, maintaining the reception of an RF signal that satisfies the expected signal quality indicator in the first RF signal and the second RF signal;
- the signal quality indicator determining module is configured to perform quality indicator judgment on the first radio frequency signal or the second radio frequency signal in sequence, and sequentially feed the judgment result to the switch control module, which mainly includes a demodulator and a main CPU.
- the radio frequency signal after the radio frequency signal enters the CMMB chip, it first enters the first tuner and the second tuner, and is sent to the demodulation after being subjected to internal LNA, mixing, DC correction, low-pass filtering, and gain amplification.
- the demodulator is a demodulation chip that receives the zero intermediate frequency signal from the tuner. After channel demodulation and forward error correction, the standard format TS stream is formed and sent to the main CPU for decoding and restoration.
- the demodulator has a programmable DSP hardware system with multiple interface functions (USB, SDIO, SPI and BUS) and built-in MPE-FEC memory. The demodulator controls the tuner via the I2C bus.
- the demodulator processes the IQ-like differential signal from the tuner, mediates it into a standard TS stream and sends it to the main CPU to decode and restore and read the desired power intensity value, SNR signal-to-noise ratio value, BER error rate value, and read value.
- the switch control module can control to turn off the RF line and enable another one. If the requirements are met, the RF line remains unchanged and the system continues to work.
- the antenna output is connected to the dual L matching network input, and the dual L matching network is used to debug the passive station in the high frequency range.
- the double L matching network output is connected to a bandpass filter.
- the bandpass range of this filter is 470-798MHz, which has a high quality factor.
- the output of the filter is directly connected
- the CMMB processes the chip's RF input and transmits the signal to the first tuner.
- FIG. 4 it is a block diagram of the second RF branch connection, that is, a low-band RF branch connection block diagram, the antenna output end is connected to the first dual L matching network input end, and the first dual L matching network output end is connected to the LNA circuit input end.
- an LNA circuit adapted to the frequency range is selected.
- the low noise amplifier (LNA) is a high performance device, and its noise figure is directly superimposed on the noise figure of the system. The performance of the low noise amplifier is particularly important to reduce the noise of the system.
- the selected low-noise amplifier can provide large gain at 474-562Mhz frequency, while the smaller noise figure is less than ldB, the low-noise amplifier provides 10dB gain in the whole frequency band, and the LNA circuit output is connected to the second dual L matching network.
- the second dual L-matching network output is connected to a bandpass filter with a bandpass filter bandpass range of 470-798MHz with a high quality factor.
- the output of the filter is directly connected to the CMMB processing chip grading receiver and transmits the signal to the second tuner.
- FIG. 5 is a general frame diagram of the present invention.
- the antenna and the CMMB chip are connected by two RF lines, and the two RF lines share one antenna.
- the first RF line is shown in Figure 3.
- the RF signal enters the chip directly through the RF receiving pin of the CMMB chip.
- the second RF line is shown in Figure 4.
- the RF signal enters the chip directly through the grading receiving pin of the CMMB chip.
- FIG. 6 is a flow chart of the operation of the present invention.
- the CMMB internal antenna is connected to two RF branches respectively, but it is determined by the control switch module inside the CMMB chip that only one way remains connected. After one of the signals enters the demodulator inside the CMMB chip, the RF signal is subjected to channel demodulation and forward error correction, and a TS stream of a standard format is formed and sent to the main CPU for decoding and restoration, and the main CPU reads the corresponding value by decoding and restoring.
- the RF path continues to work, if the requirements are not met, it proves that the current selection of the RF path does not meet the space If the CMMB band requires, the main CPU feeds back to the switch control module command to switch to select another RF branch.
- CMMB users can According to the frequency band of the city, the current city can be actively selected. Users can select the city through the CMMB software interface. Different cities correspond to different frequency points. At this time, the main CPU reads the user data and feeds the corresponding information to the switch control module to complete the RF path. select.
- the invention also provides a device for a built-in terminal with a built-in antenna and a CMMB chip, and further comprising: a first RF branch for dropping the output of the built-in antenna into the first frequency band of the applicable band of the CMMB
- the first RF signal is transmitted to the CMMB chip
- the second RF branch is used to transmit the second RF signal of the internal antenna output falling into the second frequency band of the CMMB applicable band to the CMMB chip
- the CMMB chip pair Determining a signal quality indicator of the first radio frequency signal outputted by the first radio frequency branch and the second radio frequency signal output by the second radio frequency branch, and selecting a signal quality indicator in the first radio frequency signal and the second radio frequency signal to satisfy Expect one RF signal and discard another RF signal.
- the CMMB chip includes:
- a first tuner for receiving and tuning a first radio frequency signal output by the first radio frequency branch
- a second tuner for receiving and tuning a second radio frequency signal output by the second radio frequency branch
- a module configured to respectively receive a first radio frequency signal and a second radio frequency signal tuned via the first tuner and the second tuner, and maintain a first radio frequency signal and a second radio frequency after obtaining a signal quality indicator The signal quality indicator in the signal satisfies the expected reception of an RF signal;
- the signal quality indicator determining module is configured to perform quality indicator judgment on the first radio frequency signal or the second radio frequency signal in sequence, and sequentially feed the judgment result to the switch control module.
- the first RF branch is a high-band RF branch, as shown in FIG. 3, including: a dual L matching network, and an input end thereof is connected to the built-in antenna output end; a bandpass filter having an input coupled to the output of the dual L matching network;
- the output of the band pass filter is coupled to the input of the first tuner of the CMMB chip as a high frequency tuner.
- the second RF branch is a low-band RF branch.
- the method includes: a first dual-L matching network, where an input end is connected to the output end of the built-in antenna;
- An LNA circuit having an input connected to an output of the first dual L matching network
- a second dual L matching network having an input coupled to an output of the LNA circuit; a bandpass filter having an input coupled to an output of the second dual L matching network; wherein, the output of the bandpass filter The terminal is coupled to the input of the second tuner as a low frequency tuner in the CMMB chip.
- the method and device for the built-in terminal of the CMMB antenna of the present invention can first divide the frequency range of the CMMB band, and the signals of different bands are transmitted through different RF branches. And through the chip to judge, select the RF branch transmission signal that meets the requirements, so that the CMMB antenna is more miniaturized, which makes up for the problem that the CMMB antenna has strict requirements for the built-in antenna space due to the working frequency band, and solves the problem that the handheld terminal always uses the whip antenna.
- the problem of receiving CMMB TV signals facilitates the flexible application of mobile phones and small terminals.
- the problem that the CMMB is directly received from the low frequency signal is guaranteed.
- separate processing for different frequency bands is more simplified during the R&D and debugging process, and the signal processing effect is better.
- the RF end of the CMMB chip is provided with a tuner for receiving RF branches of different frequency bands. After different tuning processes, the quality index of the signal is judged, and then the judgment result is fed back to the switch control module of the control RF branch, and the chip is simple. After the upgrade plan, the above functions can be realized to meet and guarantee the receiving performance of the CMMB full-band.
- the solution is simple to implement and easy to promote. It is to be understood that the specific implementation of the invention is not limited to the description. It will be apparent to those skilled in the art that the present invention may be made without departing from the spirit and scope of the invention.
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Abstract
本发明公开了一种手持式终端内置CMMB天线的方法及其装置,其中,CMMB适用波段的频段范围被至少划分成第一频段和第二频段;从内置天线输出的落入所述第一频段内的第一射频信号经由第一射频支路传送给CMMB芯片;从内置天线输出的落入所述第二频段内的第二射频信号经由第二射频支路传送给CMMB芯片;所述CMMB芯片对所述第一射频支路输出的第一射频信号和所述第二射频支路输出的第二射频信号的信号质量指标进行判断,选用所述第一射频信号和第二射频信号中信号质量指标满足预期的一个射频信号。本发明方法和装置,可以提升接收信号的灵敏度,提高CMMB手持设备电视接收效果。
Description
一种手持式终端内置 CMMB天线的方法及其装置 技术领域
本发明涉及一种终端内置 CMMB ( China Mobile Multimedia Broadcasting, 中国移动多媒体广播) 天线的方法及其装置, 尤其适用于提 高手持式终端 CMMB接收效果的内置天线的方法及其装置。 背景技术
CMMB 主要面向小屏幕手持式终端设备, 其终端产品种类主要包括 MP4、 手机、 GPS、 USB接收棒、 独立接收机等, 提供数字广播电视节目、 综合信息和紧急广播服务, 实现卫星传输与地面网络相结合的无缝协同覆 盖。 CMMB釆用具有自主知识产权的移动多媒体广播电视技术, 系统可运 营、 可维护、 可管理, 具备广播式、 双向式服务功能, 支持中央和地方相 结合的运营体系, 具备加密授权控制管理体系, 支持统一标准和统一运营, 支持用户全国漫游。
目前 CMMB手持设备的电视天线均釆用外置拉杆天线来实现, 然而拉 杆天线由于价格贵、不美观且外置容易损伤等诸多原因存在,故内置 CMMB 天线方案重要性不断提升。
而且, 由于 CMMB地面基站 U波段要求频段范围 474— 798Mhz, 所 以 CMMB内置天线所需尺寸很难满足此频段要求, 内置天线接收能力远弱 于外置天线。 尤其是 CMMB的较低频段 474-562Mhz频段范围, 一直是天 线设计的难点, 即使是拉杆天线也很难在此频段内达到满意的接收指标。 目前为了解决此问题也有一些方案加载了 LNA电路模块对内置 CMMB天 线损失的信号进行补偿, 但是这样的设计方案对天线自身带宽要求很高, 即对 CMMB天线尺寸同样有一定需要, 并且很难控制来自于手机内部的干
扰, LNA在放大信号的同时也放大了噪声信号, 有一些频点存在被噪声淹 没可能, 反而恶化了 CMMB 接收能力。 到目前市场上仍然没有成熟的 CMMB天线内置方案。 发明内容
本发明的主要目的在于提供一种手持式终端内置 CMMB天线的方法及 其装置, 以提升接收信号的灵敏度, 提高 CMMB手持设备电视接收效果。
为了达到上述目的, 本发明的技术方案是这样实现的:
一种手持式终端内置 CMMB天线的方法, 该方法包括:
CMMB适用波段的频段范围被至少划分成第一频段和第二频段; 从内置天线输出的落入所述第一频段内的第一射频信号经由第一射频 支路传送给 CMMB芯片;从内置天线输出的落入所述第二频段内的第二射 频信号经由第二射频支路传送给 CMMB芯片;
所述 CMMB 芯片对所述第一射频支路输出的第一射频信号和所述第 二射频支路输出的第二射频信号的信号质量指标进行判断, 选用所述第一 射频信号和第二射频信号中信号质量指标满足预期的一个射频信号。
其中, 进行所述判断时, 还包括:
接收和调谐所述第一射频支路输出的第一射频信号, 以及接收和调谐 所述第二射频支路输出的第二射频信号; 在得到所述第一射频信号、 第二 射频信号的信号质量指标后, 保持对第一射频信号和第二射频信号中信号 质量指标满足预期的一个射频信号的接收;
对所述第一射频信号或第二射频信号依次进行质量指标判断, 并依次 反馈判断结果。
其中, 在得到所述信号质量指标之前, 还包括: 对所述射频信号进行 解调、 解码。
其中, 所述信号质量指标包括功率强度、 信噪比和误码率值之一或组
合。
其中, 所述第一射频支路是包括双 L 匹配网络、 带通滤波器在内的高 频段射频支路。
其中, 所述第二射频支路是包括第一双 L匹配网络、 LNA电路、 第二 双 L匹配网络、 带通滤波器在内的低频段射频支路。
一种手持式终端内置 CMMB天线的装置, 包括内置天线和 CMMB芯 片, 还包括:
第一射频支路,用于把内置天线输出的落入 CMMB适用波段中第一频 段内的第一射频信号传送给 CMMB芯片;
第二射频支路,用于把内置天线输出的落入 CMMB适用波段中第二频 段内的第二射频信号传送给 CMMB芯片;
所述 CMMB芯片,用于对所述第一射频支路输出的第一射频信号和所 述第二射频支路输出的第二射频信号的信号质量指标进行判断, 选用所述 第一射频信号和第二射频信号中信号质量指标满足预期的一个射频信号。
其中, 所述 CMMB芯片包括:
第一调谐器, 用于接收和调谐所述第一射频支路输出的第一射频信号; 第二调谐器, 用于接收和调谐所述第二射频支路输出的第二射频信号; 开关控制模块, 用于分别接收经由所述第一调谐器和所述第二调谐器 调谐的第一射频信号和第二射频信号, 并在得到信号质量指标后, 保持对 第一射频信号和第二射频信号中信号质量指标满足预期的一个射频信号的 接收;
信号质量指标判断模块, 用于对所述第一射频信号或第二射频信号依 次进行质量指标判断, 并将判断结果依次反馈给所述开关控制模块。
其中, 所述第一射频支路是高频段射频支路, 包括:
双 L匹配网络, 其输入端与所述内置天线输出端连接;
带通滤波器, 其输入端与双 L匹配网络输出端连接;
其中,所述带通滤波器的输出端连接所述 CMMB芯片中作为高频调谐 器的第一调谐器的输入端。
其中, 所述第二射频支路是低频段射频支路, 包括:
第一双 L匹配网络, 其输入端与所述内置天线输出端连接;
LNA电路, 其输入端连接所述第一双 L匹配网络的输出端; 第二双 L匹配网络, 其输入端连接所述 LNA电路的输出端; 带通滤波器, 其输入端连接所述第二双 L匹配网络的输出端; 其中, 所述带通滤波器的输出端连接所述 CMMB芯片中作为低频调谐 器的第二调谐器的输入端。
与现有技术相比较, 本发明的有益效果在于:
1 )先将 CMMB波段的频段范围进行划分, 不同波段的信号通过不同 的射频支路传输, 并通过其芯片进行判断, 选择满足要求的射频支路传输 信号, 从而使 CMMB天线更加小型化, 弥补了 CMMB天线由于工作频段 导致内置天线空间要求苛刻的问题, 解决了手持终端一直使用拉杆天线接 收 CMMB电视信号问题, 方便了手机以及小型终端的灵活应用。
2 )通过对不同频段的射频支路接收信号, 保证了 CMMB—直以来接 收低频信号较弱的问题。 并且针对不同频段特点分开处理, 在研发调试过 程中更加简化, 信号处理效果更好。
3 ) CMMB芯片的射频端设置有接收不同频段射频支路的调谐器,通过 不同调谐处理后, 再对信号进行质量指标判断, 然后将判断结果反馈给控 制射频支路的开关控制模块, 芯片简单升级方案后, 便可实现上述功能, 满足与保证 CMMB全频段的接收性能, 该方案实现简单, 易于推广。 附图说明
图 1是本发明手持式终端内置 CMMB天线的方法流程图;
图 2是本发明中的 CMMB芯片内部结构框图;
图 3是本发明中高频段射频支路连接框图;
图 4是本发明中低频段射频支路连接框图;
图 5是本发明总体连接框图;
图 6是本发明工作流程框图。 具体实施方式
以下结合附图对本发明的优选实施例进行详细说明, 应当理解, 以下 所说明的优选实施例仅用于说明和解释本发明, 并不用于限定本发明。
本发明提供了一种手持式终端内置 CMMB天线的方法,其流程图如图 1所示, 包括:
511 ) CMMB适用波段的频段范围被至少划分成第一频段和第二频段;
512 )从内置天线输出的落入所述第一频段内的第一射频信号经由第一 射频支路传送给 CMMB芯片;
513 )从内置天线输出的落入所述第二频段内的第二射频信号经由第二 射频支路传送给 CMMB芯片;
S14 )所述 CMMB芯片对所述第一射频支路输出的第一射频信号和所 述第二射频支路输出的第二射频信号的信号质量指标进行判断, 选用所述 第一射频信号和第二射频信号中信号质量指标满足预期的一个射频信号, 并丟弃另一个射频信号。
其中, CMMB波段的划分一般根据 CMMB地面基站 U波段要求频段 范围 474— 798Mhz要求, 选择划分成两个波段, 并根据两个波段设置射频 支路,一路按照 562-798Mhz频段要求设计射频支路,一路按照 474-562Mhz 频段要求设计射频支路; 也可以根据手持终端的技术要求设计成三条或者 三条以上射频支路, 其设置结构跟本发明中的高频段射频支路或低频段射 频支路基本相同, 在此不再赘述。
如图 2所示, 为本发明中的 CMMB芯片内部结构框图, 包括: 第一调谐器, 用于接收和调谐所述第一射频支路输出的第一射频信号; 第二调谐器, 用于接收和调谐所述第二射频支路输出的第二射频信号; 开关控制模块, 用于分别接收经由所述第一调谐器和所述第二调谐器 调谐的第一射频信号和第二射频信号, 并在得到信号质量指标后, 保持对 第一射频信号和第二射频信号中信号质量指标满足预期的一个射频信号的 接收;
信号质量指标判断模块, 用于对所述第一射频信号或第二射频信号依 次进行质量指标判断, 并将判断结果依次反馈给所述开关控制模块, 其主 要包括解调器和主 CPU。
其中, 如图 2所示, 射频信号进入 CMMB芯片后, 首先进入第一调谐 器和第二调谐器, 在此经过内部 LNA、 混频、 DC校正、 低通滤波和增益 放大后送给解调器。 解调器为解调芯片, 它接收来自调谐器的零中频信号, 经过信道解调和前向纠错后,形成标准格式的 TS流送给主 CPU解码还原。 解调器内置可编程的 DSP硬件系统, 具有多种接口功能(USB、 SDIO、 SPI 和 BUS总线), 并内置 MPE-FEC内存。 解调器通过 I2C总线实现对调谐器 的控制。 解调器处理来自调谐器类似 IQ的差分信号, 调解成标准 TS流送 给主 CPU解码还原并读取到希望得到的功率强度值, SNR信噪比值, BER 误码率值,读取值后主 CPU反馈给开关控制模块进行判断,是否满足预期, 如未满足需求,开关控制模块可控制关闭此射频线路而启用另外一条, 如满 足要求, 那么射频线路不变, 系统继续工作。
如图 3 所示, 为第一射频支路连接框图, 即高频段射频支路连接结构 框图, 天线输出端连接双 L匹配网络输入端, 双 L匹配网络用来调试高频 段范围内无源驻波, 满足指标要求, 双 L匹配网络输出端连接带通滤波器, 此滤波器带通范围 470— 798MHz, 有高品质因子。 滤波器的输出直接接到
CMMB处理芯片射频输入端, 并将信号传输给第一调谐器。
如图 4所示, 为第二射频支路连接框图, 即低频段射频支路连接框图, 天线输出端连接第一双 L匹配网络输入端, 第一双 L匹配网络输出端连接 LNA电路输入端,此处选用适应频段范围的 LNA电路,所述低噪声放大器 ( LNA ) 为高性能器件, 其噪声系数直接叠加到系统的噪声系数上, 低噪 声放大器的性能尤为重要, 为减小系统的噪声指数, 所选用的低噪声放大 器在 474— 562Mhz频率能提供较大增益,同时具有较小噪声指数小于 ldB, 低噪放大器全频段提供 10dB增益, LNA电路输出端连接第二双 L匹配网 络, 前后网络整体调试, 满足此频带范围要求。 第二双 L 匹配网络输出端 连接带通滤波器, 带通滤波器带通范围 470— 798MHz, 有高品质因子。 滤 波器的输出直接接到 CMMB处理芯片分级接收端, 并将信号传输给第二调 谐器。
其中图 5为本发明总体框架图,天线与 CMMB芯片之间通过两路射频 线路连接, 两路射频线路共用一个天线。 第一条射频线路如图 3 , 射频信号 直接通过 CMMB芯片的射频接收管脚进入芯片。 第二条射频线路如图 4, 射频信号直接通过 CMMB芯片的分级接收管脚进入芯片。
图 6是本发明工作流程图。 CMMB内置天线分别连接两路射频支路, 但由 CMMB芯片内部的控制开关模块决定始终只有一路保持连通状态。 当 其中一路信号进入 CMMB芯片内部的解调器后,射频信号经过信道解调和 前向纠错后, 形成标准格式的 TS流送给主 CPU解码还原, 主 CPU通过解 码还原读取到相应值, 如功率强度值, 信噪比值, 误码率值, 并与信号质 量指标对比, 如满足要求, 那么此射频通路继续工作, 如未满足要求, 证 明目前选择射频通路并不满足空间中的 CMMB频段要求, 则主 CPU反馈 给开关控制模块指令从而切换选择另外一条射频支路。
另外若 CMMB上层软件开发中增加城市选择列表, CMMB用户可以
根据所在城市频段主动选择目前城市,用户可以通过 CMMB软件界面选择 所在城市, 不同城市对应不同频点, 这时主 CPU会读取用户数据, 并反馈 相应信息给开关控制模块, 从而完成射频通路的选择。
这种方案有一定优势性, 对 CMMB不同频段的针对处理, 有效解决了 CMMB天线内置后天线带宽不足, 低频指标差的问题。 并且方便简化研发 的设计与后期的调试。
本发明还提供了一种手持式终端内置 CMMB天线的装置, 包括内置天 线和 CMMB 芯片, 还包括: 第一射频支路, 用于把内置天线输出的落入 CMMB适用波段中第一频段内的第一射频信号传送给 CMMB芯片; 第二 射频支路,用于把内置天线输出的落入 CMMB适用波段中第二频段内的第 二射频信号传送给 CMMB芯片; 其中, 所述 CMMB芯片对所述第一射频 支路输出的第一射频信号和所述第二射频支路输出的第二射频信号的信号 质量指标进行判断, 选用所述第一射频信号和第二射频信号中信号质量指 标满足预期的一个射频信号, 并丟弃另一个射频信号。
其中, 如图 2所示, CMMB芯片包括:
第一调谐器, 用于接收和调谐所述第一射频支路输出的第一射频信号; 第二调谐器, 用于接收和调谐所述第二射频支路输出的第二射频信号; 开关控制模块, 用于分别接收经由所述第一调谐器和所述第二调谐器 调谐的第一射频信号和第二射频信号, 并在得到信号质量指标后, 保持对 第一射频信号和第二射频信号中信号质量指标满足预期的一个射频信号的 接收;
信号质量指标判断模块, 用于对所述第一射频信号或第二射频信号依 次进行质量指标判断, 并将判断结果依次反馈给所述开关控制模块。
其中, 第一射频支路是高频段射频支路, 如图 3所示, 包括: 双 L匹配网络, 其输入端与所述内置天线输出端连接;
带通滤波器, 其输入端与双 L匹配网络输出端连接;
其中, 所述带通滤波器的输出端连接所述 CMMB芯片中作为高频调谐 器的第一调谐器的输入端。
其中, 第二射频支路是低频段射频支路, 如图 4所示, 包括: 第一双 L匹配网络, 其输入端与所述内置天线输出端连接;
LNA电路, 其输入端连接所述第一双 L匹配网络的输出端;
第二双 L匹配网络, 其输入端连接所述 LNA电路的输出端; 带通滤波器, 其输入端连接所述第二双 L匹配网络的输出端; 其中, 所述带通滤波器的输出端连接所述 CMMB芯片中作为低频调谐 器的第二调谐器的输入端。
综上所述可见,无论是方法还是装置,本发明的手持式终端内置 CMMB 天线的方法及其装置, 均可先将 CMMB波段的频段范围进行划分, 不同波 段的信号通过不同的射频支路传输, 并通过其芯片进行判断, 选择满足要 求的射频支路传输信号, 从而使 CMMB天线更加小型化, 弥补了 CMMB 天线由于工作频段导致内置天线空间要求苛刻的问题, 解决了手持终端一 直使用拉杆天线接收 CMMB电视信号问题, 方便了手机以及小型终端的灵 活应用。
并且, 通过对不同频段的射频支路接收信号, 保证了 CMMB—直以来 接收低频信号较弱的问题。 还有, 针对不同频段特点分开处理, 在研发调 试过程中更加简化, 信号处理效果更好。
另外, CMMB芯片的射频端设置有接收不同频段射频支路的调谐器, 通过不同调谐处理后, 再对信号进行质量指标判断, 然后将判断结果反馈 给控制射频支路的开关控制模块, 芯片简单升级方案后, 便可实现上述功 能, 满足与保证 CMMB全频段的接收性能, 该方案实现简单, 易于推广。
明, 不能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术 领域的普通技术人员来说, 在不脱离本发明构思的前提下, 还可以做出若 干简单推演或替换, 都应当视为属于本发明的保护范围。
Claims
1、 一种手持式终端内置中国移动多媒体广播 CMMB天线的方法, 该 方法包括:
CMMB适用波段的频段范围被至少划分成第一频段和第二频段; 从内置天线输出的落入所述第一频段内的第一射频信号经由第一射频 支路传送给 CMMB芯片;从内置天线输出的落入所述第二频段内的第二射 频信号经由第二射频支路传送给 CMMB芯片;
所述 CMMB 芯片对所述第一射频支路输出的第一射频信号和所述第 二射频支路输出的第二射频信号的信号质量指标进行判断, 选用所述第一 射频信号和第二射频信号中信号质量指标满足预期的一个射频信号。
2、 根据权利要求 1所述的方法, 其中, 进行所述判断时, 还包括: 接收和调谐所述第一射频支路输出的第一射频信号, 以及接收和调谐 所述第二射频支路输出的第二射频信号; 在得到所述第一射频信号、 第二 射频信号的信号质量指标后, 保持对第一射频信号和第二射频信号中信号 质量指标满足预期的一个射频信号的接收;
对所述第一射频信号或第二射频信号依次进行质量指标判断, 并依次 反馈判断结果。
3、根据权利要求 2所述的方法,其中,在得到所述信号质量指标之前, 还包括: 对所述射频信号进行解调、 解码。
4、 根据权利要求 1所述的方法, 其中, 所述信号质量指标包括功率强 度、 信噪比和误码率值之一或组合。
5、 根据权利要求 1至 4任一项所述的方法, 其中, 所述第一射频支路 是包括双 L匹配网络、 带通滤波器在内的高频段射频支路。
6、 根据权利要求 1至 4任一项所述的方法, 其中, 所述第二射频支路 是包括第一双 L匹配网络、 LNA电路、 第二双 L匹配网络、 带通滤波器在 内的低频段射频支路。
7、 一种手持式终端内置 CMMB天线的装置, 包括内置天线和 CMMB 芯片, 还包括:
第一射频支路,用于把内置天线输出的落入 CMMB适用波段中第一频 段内的第一射频信号传送给 CMMB芯片;
第二射频支路,用于把内置天线输出的落入 CMMB适用波段中第二频 段内的第二射频信号传送给 CMMB芯片;
所述 CMMB芯片,用于对所述第一射频支路输出的第一射频信号和所 述第二射频支路输出的第二射频信号的信号质量指标进行判断, 选用所述 第一射频信号和第二射频信号中信号质量指标满足预期的一个射频信号。
8、 根据权利要求 7所述的装置, 其中, 所述 CMMB芯片包括: 第一调谐器, 用于接收和调谐所述第一射频支路输出的第一射频信号; 第二调谐器, 用于接收和调谐所述第二射频支路输出的第二射频信号; 开关控制模块, 用于分别接收经由所述第一调谐器和所述第二调谐器 调谐的第一射频信号和第二射频信号, 并在得到信号质量指标后, 保持对 第一射频信号和第二射频信号中信号质量指标满足预期的一个射频信号的 接收;
信号质量指标判断模块, 用于对所述第一射频信号或第二射频信号依 次进行质量指标判断, 并将判断结果依次反馈给所述开关控制模块。
9、 根据权利要求 7或 8所述的装置, 其中, 所述第一射频支路是高频 段射频支路, 包括:
双 L匹配网络, 其输入端与所述内置天线输出端连接;
带通滤波器, 其输入端与双 L匹配网络输出端连接;
其中,所述带通滤波器的输出端连接所述 CMMB芯片中作为高频调谐 器的第一调谐器的输入端。
10、 根据权利要求 7或 8所述的方法, 其中, 所述第二射频支路是低 频段射频支路, 包括:
第一双 L匹配网络, 其输入端与所述内置天线输出端连接;
LNA电路, 其输入端连接所述第一双 L匹配网络的输出端; 第二双 L匹配网络, 其输入端连接所述 LNA电路的输出端; 带通滤波器, 其输入端连接所述第二双 L匹配网络的输出端; 其中,所述带通滤波器的输出端连接所述 CMMB芯片中作为低频调谐 器的第二调谐器的输入端。
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CN102769795B (zh) * | 2012-07-11 | 2015-01-28 | 深圳乐投卡尔科技有限公司 | 一种车载Android平台及其播放CMMB的方法 |
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JPH0219034A (ja) * | 1988-07-07 | 1990-01-23 | Nippon Telegr & Teleph Corp <Ntt> | ダイバーシチ受信法 |
JP2001251229A (ja) * | 2000-03-07 | 2001-09-14 | Clarion Co Ltd | 移動体用放送受信機 |
CN1998220A (zh) * | 2004-04-15 | 2007-07-11 | 高通弗拉里奥恩技术公司 | 使用具有多个接收机链的接收机在多个载波中进行选择的方法和装置 |
JP2009021900A (ja) * | 2007-07-13 | 2009-01-29 | Panasonic Corp | サイマル放送受信装置 |
JP2009118516A (ja) * | 2009-01-09 | 2009-05-28 | Xanavi Informatics Corp | デジタル放送受信方法 |
-
2011
- 2011-04-01 CN CN201110082241.1A patent/CN102142915B/zh not_active Expired - Fee Related
- 2011-06-22 WO PCT/CN2011/076113 patent/WO2012129855A1/zh active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0219034A (ja) * | 1988-07-07 | 1990-01-23 | Nippon Telegr & Teleph Corp <Ntt> | ダイバーシチ受信法 |
JP2001251229A (ja) * | 2000-03-07 | 2001-09-14 | Clarion Co Ltd | 移動体用放送受信機 |
CN1998220A (zh) * | 2004-04-15 | 2007-07-11 | 高通弗拉里奥恩技术公司 | 使用具有多个接收机链的接收机在多个载波中进行选择的方法和装置 |
JP2009021900A (ja) * | 2007-07-13 | 2009-01-29 | Panasonic Corp | サイマル放送受信装置 |
JP2009118516A (ja) * | 2009-01-09 | 2009-05-28 | Xanavi Informatics Corp | デジタル放送受信方法 |
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CN102142915A (zh) | 2011-08-03 |
CN102142915B (zh) | 2015-01-28 |
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