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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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7 J# u4 t* d' j) j7 h2 S1. Key Features
* K5 m) l/ {. l5 {1) 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
. K* M A) L4 w+ ]0 A/ ]different country spectrum requirements.
) C0 D8 N! S \$ @5 j3) 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
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other WLAN networks at 5 GHz.
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5) Secure networking to assure privacy and content rights protection.
3 l3 g# h5 v/ `0 w6) 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).
% V; a- Q: w/ ^/ i9 n8 N4 P7) Supports point-to-point video connection with full QoS and point-to-multipoint video
# O6 D9 f9 W) s; z) X& _ jbroadcasting.
I* J: G" |$ a- G0 c8) 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.
- ~& x( m, a* `3 u: J4 e8 ^' B10) Transmission of IR control signals to the video source devices from the TV location.
1 i/ w# G! u/ G/ `* G2. 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
) M* w$ s4 Q( F$ E: w2 p3 k6 Uthat can be integrated as video sender and video receiver according to the host platform. When
+ i$ |* N5 O' I( U u: w. X- p* Xused 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,
6 U1 n' f& w; ], [9 o* c0 \' Cglueless wireless connection from TS (of video source) to TS (of video display) with guaranteed
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QoS.
$ T# t/ O2 w# I, nThe 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.
' W& G# C5 Z" }2 m- bFigure 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
" I6 T5 V/ e6 y& s! aWAV3000 will be integrated. The PM supports demo and evaluation of the WAV3000 with a
" q! B6 Y% s5 {5 pvariety of video sources (analog and digital) for different applications. It also provides
( ^& V4 d6 P, M, R- ~/ Scapabilities 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
. r2 U9 v- H6 e# T8 ZParallel 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
' ?! c ]# r& E5 {& Z. s3 a% [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
0 n7 y2 l @% f3 D! mpower 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.
- z4 t$ C+ Z6 V0 b- S2 `4 System Security
/ }! V4 z$ g# z3 P; w! gThe 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
. H% M3 s" ~' X, O; Mmultiple pairs of simultaneous operations without cross talk.
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