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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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" l- ^( p: [. u5 [1. Key Features
; s) i" t' O$ A, G2 d3 A& c9 g1) Complete transceiver design of wireless communication at 5 GHz.
3 E# T% k' \6 P4 y( @! f& J: }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.
" J' e0 I! |$ u5 a3) Dynamic frequency selection to resist interferences.
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4) Close-loop power control to minimize power consumption and be a friendly neighbor to
, z, D/ v. ] N) Bother WLAN networks at 5 GHz.
% A, S* M. k3 }5 A5) 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).
/ e& i! y- d/ u. {% s6 q7) 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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9) HCI interface to the host CPU to enable flexible application development at the host level.
0 U6 E, r6 _$ ]- |( a10) 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
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0 I5 x- z9 f. t' J g' Cthat can be integrated as video sender and video receiver according to the host platform. When
" o" }" @+ Z6 z# c; b) _ x F% |used as video sender, WAV3000 can be embedded in a video source device (DVD, VCR, PVR,
% B) x# c* [9 e7 n. u K6 @STB, or PC); and when used as video receiver, WAV3000 can be embedded in a video display
' ]8 v' X Y3 o* |! [2 u2 Y& [device (TV, flat panel or video monitors). So a pair of the WAV3000 provides a complete,
. S9 M7 ]9 g9 ?; [9 Jglueless wireless connection from TS (of video source) to TS (of video display) with guaranteed
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QoS.
% L) Z- Y. ?' F3 u4 M' H \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.
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Figure 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
, z4 M" o3 ^: u0 M, tWAV3000 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.
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3 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
% H8 @, o# d" K$ b) L1 c$ vWiViTM 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.
5 A+ B0 d5 G0 J- G4 System Security
1 \- z, B1 E) p# q( l0 p9 _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
5 [/ u# P$ W; m3 n0 `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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