Automatic gain control method and device

A technology of automatic gain control and gain value, which is applied in the field of communication, can solve problems such as being unable to adapt to different modes of data transmission and affecting the quality of MBMS service data transmission, and achieve the effect of reasonable automatic gain control, reasonable gain value, and improved data transmission quality

Active Publication Date: 2011-05-18
LEADCORE TECH
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Problems solved by technology

[0006] The inventor found that: the existing automatic gain control method cannot adapt to different modes of MBMS service data transmission on the network side, especially when recovering from no signal to signal, it takes a long time to control the gain value at a reasonable level, thus affecting MBMS Service data transmission quality

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  • Automatic gain control method and device

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Embodiment Construction

[0059] In the time division code division multiple access system, taking the TD-SCDMA system as an example, its subframe (Subframe) structure is as follows Figure 4 As shown, TS0 is fixedly used for downlink, TS1 is fixedly used for uplink, and the switching point (Switching Point) is used as the dividing point between uplink and downlink time slots, which can be adjusted. For ordinary pulse (Burst), the length is 864chips, and its structure is as follows Figure 5 shown. In the TD-SCDMA system, the subframe length is 5ms, and the wireless frame length is 10ms. The terminal maintains the subframe number (SFN) according to the network system information.

[0060] TD-MBMS adopts the frame structure of the existing TD-SCDMA system, and channel multiplexing, coding, modulation, interleaving and punching all follow the 3GPP signal flow specification. The MBMS time slot adopts quadrature phase shift keying (QPSK) modulation and Turbo coding. The MBMS service is a one-way downlin...

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Abstract

The invention discloses an automatic gain control method and a device. The method comprises: receiving MBMS (multimedia broadcast multicast service) data at a preinstalled service time slot, and determining a gain value of the current service time slot according to an SNR (signal to noise ratio)smoothed value, a synchronizing outburst adjudication result and a CRC (cyclical redundancy check) verified result corresponding to the received MBMS data; and adjusting the gain of a receiver machine according to the gain value of the determined current service time slot. By the automatic gain control method and the device, the automatic gain control can be carried out reasonably, and the data transmission quality of the MBMS service can be improved.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to an automatic gain control method and device. Background technique [0002] With the evolution of society and the progress of science and technology, in addition to meeting the needs of basic communication, the trend of multi-functionality and multimedia of mobile phones is becoming more and more obvious. From calls to text messages, from Internet access to music, all kinds of data value-added services emerge in an endless stream, and now the advent of the 3G+ era has made it a reality to "hold" the TV. However, the mobile TV currently provided in China is a point-to-point unicast multimedia service. In this way, the resource utilization rate is low, the cost is high, and the tariff is expensive, which is not conducive to the promotion of the service; while point-to-multipoint broadcasting such as community broadcasting At present, the business can only carry out s...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/04
Inventor 朱宇洪
Owner LEADCORE TECH
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