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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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/ ^0 ^( d- }3 ]9 d4 ]1. Key Features
, E- K+ Q0 K5 x" o& X+ |6 w1) 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.
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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.
. F% \+ q8 x( o/ X" v1 ]5) Secure networking to assure privacy and content rights protection.
8 Y1 }+ H( R+ {# e6 a6) 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).
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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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: n; {. N7 V, T0 S$ w5 V* x4 e9) 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
+ e9 F( \% {1 E+ G7 T! ythat can be integrated as video sender and video receiver according to the host platform. When
5 K# F$ _& l1 w/ Y4 I8 Eused 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,
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glueless wireless connection from TS (of video source) to TS (of video display) with guaranteed
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9 D7 J# L* Q# ?: J) @. D g: u/ KThe WAV3000 includes a configurable expansion connector (CEC). All I/O signals can be
8 l! }$ |1 P2 G. |* hrouted 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
! J* {% s% Q) \+ `' I% Z- o0 amodule (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.
4 F+ \+ M. n. J, L2 T4 o; d# P2 @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
( ]; j+ b& c; R5 D! y" J. hWiViTM wireless networking technology at 5 GHz.
Supports 4.9 to 5.9 GHz frequency band and is controlled by software to comply with
0 Y( U8 H6 I& ~/ c9 ], ldifferent 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.
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4 System Security
% s& {% O8 ]" R! |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
* x' O2 u1 l. \, E2 n. eensures 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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