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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* S! G' a2 h b, B1. Key Features
% @, r( j; U& o$ S6 b- i4 l) q1) 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
& @' J0 I: v) C6 y6 y' w; adifferent country spectrum requirements.
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3) Dynamic frequency selection to resist interferences.
6 ]) _4 j3 `3 h/ b- J4) Close-loop power control to minimize power consumption and be a friendly neighbor to
, r8 A* M8 h+ V( ~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).
1 N- d9 @' }4 X7 B4 \' D& [7) Supports point-to-point video connection with full QoS and point-to-multipoint video
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broadcasting.
) y; _7 F" }, O8 |8) Configurable expansion I/O connector enabling easy integration with existing host
9 v% j& L8 k6 C2 k2 h2 ?systems.
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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.
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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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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
. v' f8 F+ f# N- K/ ~used as video sender, WAV3000 can be embedded in a video source device (DVD, VCR, PVR,
$ m O4 l0 i% M1 K5 M6 M TSTB, or PC); and when used as video receiver, WAV3000 can be embedded in a video display
, ?# Z! r' B7 z/ ?device (TV, flat panel or video monitors). So a pair of the WAV3000 provides a complete,
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glueless wireless connection from TS (of video source) to TS (of video display) with guaranteed
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QoS.
, G7 ~7 l) V$ U1 xThe 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.
5 j" y# S& R( ~2 NFigure 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
2 L' {/ @6 y' O% l: U& _1 `3 w( Z Fcapabilities for test and debugging of the core module.
+ R$ z D( Q+ }3 Functional Specifications
The WAV3000 supports standard MPEG Transport Stream input and output in either
+ G( W& x. X1 i R/ Y# E) QParallel 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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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.
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4 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
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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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