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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.
8 W) M3 H7 Z! D+ a. ^2) Supports 4.9 to 5.9 GHz frequency band and is controlled by software to comply with
, s- Z, N; y3 Pdifferent country spectrum requirements.
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3) Dynamic frequency selection to resist interferences.
6 P- B3 A* \/ L& B1 e8 r- y4) Close-loop power control to minimize power consumption and be a friendly neighbor to
8 K! D. x/ c+ n2 J3 w6 c% o: ^other WLAN networks at 5 GHz.
/ k) k' T! J% n' ^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,
' x* D9 @& W# w( J9 Q3 ]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.
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8) Configurable expansion I/O connector enabling easy integration with existing host
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, V% P* r5 ]5 ~- l9) HCI interface to the host CPU to enable flexible application development at the host level.
7 u1 j; }9 l0 D& L2 `( |10) Transmission of IR control signals to the video source devices from the TV location.
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2. System Diagram
- G8 Q% V3 V) j5 t5 D- WWAV3000 wireless module creates a proprietary 5 GHz wireless network for MPEG
0 {1 v6 x' m. Ctransport 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
/ X0 G- _; @( p4 N, tused 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
4 f0 I% f1 I: w K; P6 D$ R0 ~device (TV, flat panel or video monitors). So a pair of the WAV3000 provides a complete,
' d; Z; T* i# e# N- Z- J0 uglueless wireless connection from TS (of video source) to TS (of video display) with guaranteed
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QoS.
$ x6 f# g$ e! B* pThe 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.
4 a. I1 X0 l8 e! L/ B+ }( gFigure 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
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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.
" @! f* ?* v0 D. ]6 J+ e/ n3 Functional Specifications
The WAV3000 supports standard MPEG Transport Stream input and output in either
( L; {' g* H( ~; r9 iParallel 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
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different 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.
3 B+ T3 E$ D2 D; l8 t, t: W: ~4 System Security
* N) i, F" O8 Q* TThe communication is authenticated and the media stream is encrypted to assure for
, _! J2 R3 F. ^! ~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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