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Wireless data transmission method for adjusting parameters according to changes of both signal source and signal channel

A technology for wireless data transmission and channel change, applied in wireless communication, network traffic/resource management, electrical components, etc., can solve problems such as low resource utilization efficiency, and achieve the effect of improving spectrum utilization, strong practicability, and easy implementation.

Inactive Publication Date: 2013-10-23
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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Problems solved by technology

For this important characteristic of both time-varying channels and time-varying sources, if the current traditional design method is used, that is, under the worst channel conditions, a fixed transmission scheme is designed according to the QoS of the most demanding media services. It can achieve the purpose of meeting the QoS requirements of all media services, but it will inevitably cause inefficient resource utilization most of the time

Method used

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  • Wireless data transmission method for adjusting parameters according to changes of both signal source and signal channel

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Embodiment Construction

[0036] based on the following figure 1 , specifically explain the preferred embodiment of the present invention.

[0037] Such as figure 1 As shown, in this embodiment, direct sequence code division multiple access technology is adopted, and time slots and spreading codes are mapped into basic logical channels. The coding efficiency, constellation size, and transmission power of the coded modulator are variable, while the coded modulator structure and decoding algorithm remain unchanged in all rate domains.

[0038] For each user, different media services are multiplexed into an integrated data stream, which is transmitted in parallel by one or more spreading codes after channel coding, modulation and power control. Using the currently transmitted media service type as a parameter, allocate a dedicated service channel (spreading code) according to step 2, so as to meet the data rate and maximum delay requirements. At the same time, according to the BER requirements in the Q...

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Abstract

Provided is a wireless data transmission method for adjusting parameters according to changes of both a signal source and a signal channel. The wireless data transmission method enables wireless data transmission parameters to be dynamically adjusted according to both change of QoS requirements of different transmission media and change of the fading level of a wireless channel by making full use of dual time-variable characteristics of a transmission media service and a wireless transmission channel of a mobile multimedia communication system, enables data rates and the maximum delay requirements of different media services to be achieved by dynamically allocating dedicated service channels, and enables BER performance requirements of different media services to be met by dynamically changing the code rate of a coder and the constellation size of a modulator and adopting channel inversion power control. Meanwhile, the spectrum utilization rate of a wireless communication system is maximized.

Description

technical field [0001] The invention relates to a wireless data transmission method for adjusting parameters according to information source and channel changes simultaneously. Background technique [0002] Reliability and efficiency have always been the main goals in the design of digital communication systems, and mobile multimedia communication puts forward stricter requirements on the reliability and efficiency of the system: on the one hand, the integrated transmission of different media requires the communication system to be able to The wireless channel meets the QoS (Quality of Service) requirements of different media; on the other hand, the limitations of wireless spectrum and terminal volume require the system to use limited bandwidth and power to provide higher transmission rates. For this important characteristic of both time-varying channels and time-varying sources, if the current traditional design method is used, that is, under the worst channel conditions, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/18
Inventor 左健存
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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