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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
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1) Complete transceiver design of wireless communication at 5 GHz.
* J2 I% I: V& k& j$ z- p' \( Q2) Supports 4.9 to 5.9 GHz frequency band and is controlled by software to comply with
9 u1 \* a* G1 ^4 o" `; A1 bdifferent country spectrum requirements.
2 N4 p5 B& n% }6 M# j3) Dynamic frequency selection to resist interferences.
3 j- `5 B& c6 J% ?) V5 c4) Close-loop power control to minimize power consumption and be a friendly neighbor to
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other WLAN networks at 5 GHz.
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5) Secure networking to assure privacy and content rights protection.
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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).
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7) Supports point-to-point video connection with full QoS and point-to-multipoint video
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broadcasting.
$ n- j0 a: Y8 x! S4 j8) Configurable expansion I/O connector enabling easy integration with existing host
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systems.
+ }2 u& l$ e! {9) HCI interface to the host CPU to enable flexible application development at the host level.
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10) Transmission of IR control signals to the video source devices from the TV location.
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2. System Diagram
1 H5 r& @% d9 V2 F/ z- CWAV3000 wireless module creates a proprietary 5 GHz wireless network for MPEG
: \$ o1 H: d) [) N" Wtransport 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
- ?9 D" G, W0 ]; }used 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
, ]8 q# _$ ^8 X! {7 k+ V9 h0 @device (TV, flat panel or video monitors). So a pair of the WAV3000 provides a complete,
" B6 v; i! J' R6 V; iglueless 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.
: V$ J9 n# a( h: u8 jFigure 1 gives a functional block diagram of the WAV3000 and associated personality
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module (PM). The personality module intends to simulate the host product platform in which the
7 u" N* i0 _& G* ^' Z! @4 ]' j9 D2 F" bWAV3000 will be integrated. The PM supports demo and evaluation of the WAV3000 with a
# k8 c6 P5 Q9 [% F" Q% O7 [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.
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3 Functional Specifications
The WAV3000 supports standard MPEG Transport Stream input and output in either
. l! f7 p* S* U l: VParallel or Serial mode.
The Tx unit transmits the compressed MPEG TS signal to the Rx unit over the air, using the
, p7 y- F# `3 q/ u) h5 ZWiViTM wireless networking technology at 5 GHz.
Supports 4.9 to 5.9 GHz frequency band and is controlled by software to comply with
^# Z* _6 K X9 Odifferent 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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2 w" @4 J# N ?6 }5 ~) s& R6 Z4 System Security
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The 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
% _$ m# [- d( S+ R' w4 | |ensures private communications between each pair of units. This also allow for coexistence of
" v/ k1 s1 g: E& nmultiple pairs of simultaneous operations without cross talk.
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