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发表于 2007-2-10 01:31:38
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re:5G 无线数字音视频传输模块介绍：...
5G 无线数字音视频传输模块介绍：
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1. Key Features
. ~% M# [' E" |7 L1) Complete transceiver design of wireless communication at 5 GHz.
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2) Supports 4.9 to 5.9 GHz frequency band and is controlled by software to comply with
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different country spectrum requirements.
5 o& n1 P& j, @8 G9 B3) Dynamic frequency selection to resist interferences.
5 C+ _3 V2 C8 B/ P0 X4) Close-loop power control to minimize power consumption and be a friendly neighbor to
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other WLAN networks at 5 GHz.
! j$ X5 V i: [8 n E9 L5) Secure networking to assure privacy and content rights protection.
! h2 M; {+ s8 B- T+ N/ ^6) Supports most of the digital video formats at TS layer including MPEG-2, MPEG-4,
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H.264 and VC-1 (WM-9).
) _: i8 [3 i3 [8 e: m) v7) Supports point-to-point video connection with full QoS and point-to-multipoint video
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8) Configurable expansion I/O connector enabling easy integration with existing host
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systems.
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9) HCI interface to the host CPU to enable flexible application development at the host level.
}. c; _9 C& ?' n10) Transmission of IR control signals to the video source devices from the TV location.
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2. System Diagram
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WAV3000 wireless module creates a proprietary 5 GHz wireless network for MPEG
/ I! E# g: p+ s/ t2 v$ L7 _transport stream (TS) communication. The WAV3000 is a complete wireless transceiver module
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that can be integrated as video sender and video receiver according to the host platform. When
5 ]8 ~! ]& j2 h# c. q( Z: eused as video sender, WAV3000 can be embedded in a video source device (DVD, VCR, PVR,
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STB, or PC); and when used as video receiver, WAV3000 can be embedded in a video display
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device (TV, flat panel or video monitors). So a pair of the WAV3000 provides a complete,
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glueless wireless connection from TS (of video source) to TS (of video display) with guaranteed
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QoS.
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The WAV3000 includes a configurable expansion connector (CEC). All I/O signals can be
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routed and configured through the CEC enabling easy integration with existing host systems.
$ n) y$ l3 E5 n" vFigure 1 gives a functional block diagram of the WAV3000 and associated personality
2 H6 L7 Q8 a* h3 {$ ]' Vmodule (PM). The personality module intends to simulate the host product platform in which the
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WAV3000 will be integrated. The PM supports demo and evaluation of the WAV3000 with a
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variety of video sources (analog and digital) for different applications. It also provides
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capabilities for test and debugging of the core module.
4 r; Q, e0 P1 H# B" [8 Y3 Functional Specifications
The WAV3000 supports standard MPEG Transport Stream input and output in either
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Parallel or Serial mode.
The Tx unit transmits the compressed MPEG TS signal to the Rx unit over the air, using the
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WiViTM wireless networking technology at 5 GHz.
Supports 4.9 to 5.9 GHz frequency band and is controlled by software to comply with
# V; v, X" Q. C- W# m# ~: |& cdifferent country spectrum requirements.
The system support data rates from 6 Mbps to 60 Mbps.
The system supports video bit rates from 3 Mbps to 45 Mbps.
Proprietary radio resource control with dynamic frequency selection (DFS) and close-loop
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power control (CLPC).
Overall video propagation delay of less than 30 ms.
Receive sensitivity is –86 dBm for video rate of 6 Mbps, and –78 dBm for video rate of 20
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4 System Security
/ s% z5 I) H% w# x2 fThe communication is authenticated and the media stream is encrypted to assure for
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protection of copyrighted material. Flexible pairing procedure between each Tx Unit and Rx Unit
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ensures private communications between each pair of units. This also allow for coexistence of
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multiple pairs of simultaneous operations without cross talk.
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