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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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I* m4 H- `# F p1 V/ f1. Key Features
|, n" }4 o, ]. e& K7 e1 _$ h1) 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.
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3) Dynamic frequency selection to resist interferences.
* a5 B8 b" j/ B* \, `, _4) Close-loop power control to minimize power consumption and be a friendly neighbor to
6 {; a* p7 u C: Z; L% T Iother WLAN networks at 5 GHz.
- _7 x- U' G4 F" ~1 L5) 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,
3 ^% b( m$ E( D& Z- A* V+ pH.264 and VC-1 (WM-9).
1 T$ a9 I9 e _/ A7 Z3 z7) Supports point-to-point video connection with full QoS and point-to-multipoint video
" v4 S# `7 O6 z- t* v% e4 ~. hbroadcasting.
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8) Configurable expansion I/O connector enabling easy integration with existing host
X, Q/ p0 E |* msystems.
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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.
3 I' v6 q/ y- V M2. System Diagram
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WAV3000 wireless module creates a proprietary 5 GHz wireless network for MPEG
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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
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used as video sender, WAV3000 can be embedded in a video source device (DVD, VCR, PVR,
' |+ l! Q9 c0 f& |. gSTB, or PC); and when used as video receiver, WAV3000 can be embedded in a video display
: j1 I- O9 p0 x9 [9 d8 i4 p0 pdevice (TV, flat panel or video monitors). So a pair of the WAV3000 provides a complete,
9 v; l' ]) p( Y2 Wglueless wireless connection from TS (of video source) to TS (of video display) with guaranteed
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QoS.
- p1 s$ [5 Q1 ?) e, W o- z/ O) aThe 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.
3 e u/ ^, I9 V1 z! G' E0 sFigure 1 gives a functional block diagram of the WAV3000 and associated personality
8 u8 X8 o& y( f- Vmodule (PM). The personality module intends to simulate the host product platform in which the
1 F& A6 g4 v+ a0 z P8 B+ RWAV3000 will be integrated. The PM supports demo and evaluation of the WAV3000 with a
! C, I2 v: G0 D$ ivariety 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
, I% R! r+ p0 @9 ]Parallel or Serial mode.
The Tx unit transmits the compressed MPEG TS signal to the Rx unit over the air, using the
2 g' q/ C8 [6 ^1 D8 b: l0 sWiViTM wireless networking technology at 5 GHz.
Supports 4.9 to 5.9 GHz frequency band and is controlled by software to comply with
?* i# w3 m8 r% u1 F8 b% E; ?5 vdifferent 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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Mbps.
6 P1 \% t: E) o: K- { V& F6 g5 T4 System Security
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The communication is authenticated and the media stream is encrypted to assure for
+ O5 c2 l4 S0 T0 P! `! \. Cprotection 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
1 O; y' e: S) J% emultiple pairs of simultaneous operations without cross talk.
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