Multimedia Processor for Digital Broadcasting via CDMA or OFDM
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Solution Overview
Problem
Existing wireless communication technologies primarily focus on voice information transmission, failing to efficiently deliver multimedia content such as audio and video to mobile users.
Innovation Solution
A system and method for digital multimedia broadcasting that uses CDMA or OFDM technologies to transmit multimedia information from base stations to mobile stations, employing a multimedia processor to generate data streams, modulate them into data packets, and transmit over forward packet data channels, enabling both broadcast and multicast formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wireless communication technologies are used for voice information transmission, then voice communication capability is provided, but multimedia information delivery capability is insufficient
Solution Approach 1:
The patent applies universality by enabling the wireless communication system to handle multiple types of information (voice, audio, video, data) through a unified architecture. The base station and mobile station are configured to support both voice and multimedia services, with the system capable of adapting to different service types through protocol selection and resource allocation mechanisms.
Solution Approach 2:
The patent segments the multimedia data into multiple data streams at the MAC layer, which are then mapped into separate data packets for transmission. This segmentation allows efficient handling of different multimedia content types and enables parallel transmission over the forward packet data channel, improving overall transmission efficiency.
2Reliability
If CDMA or OFDM technologies are used for data transmission, then spectral efficiency and interference resistance are improved, but system complexity increases
Solution Approach 1:
The patent introduces an intermediary layer (MAC layer processor) that mediates between the higher-layer data streams and the physical layer modulation processes. This intermediary handles the complexity of data stream generation, packet mapping, and protocol management, while the physical layer focuses on the modulation techniques (CDMA/OFDM), thereby distributing complexity across different layers.
3Ease of manufacture
If existing wireless infrastructure is leveraged for multimedia broadcasting, then deployment cost is reduced, but infrastructure upgrade requirements increase
Solution Approach 1:
The patent enables existing wireless infrastructure to serve dual purposes: traditional voice communication and new multimedia broadcasting services. The base station and mobile station are configured to support both legacy and enhanced services, allowing the infrastructure to be leveraged for multimedia without requiring complete system replacement.
Solution Approach 2:
The patent implements dynamic resource allocation and protocol selection mechanisms that allow the system to adapt between different service types. The infrastructure can dynamically switch between voice and multimedia modes, and the system can flexibly allocate resources based on current service requirements, reducing the need for rigid infrastructure upgrades.
Data Source
AI summary
A system for sending multimedia information from at least one base station to one or more mobile stations via at least one wireless communication link includes at least one multimedia source for generating the multimedia information. At least one processor is coupled to the multimedia source for generating a number of data streams derived from the multimedia information on a media control access (MAC) layer. At least one data channel modulator is coupled to the processor for mapping the data streams into a number of data packets on a forward packet data channel between the base station and the mobile station, using a physical layer signaling based on a code-division multiple access (CDMA) or orthogonal frequency division modulation (OFDM) technology.