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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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) J* S# Y% @% p5 t1. Key Features
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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
4 U# u# V$ ]* X4 tdifferent country spectrum requirements.
% ~4 G! y- r8 m+ I( U3 f3) 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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' Z/ B$ F+ u- D5 G% C- j5) Secure networking to assure privacy and content rights protection.
0 Q' M9 `1 B+ s. p6) 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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8) Configurable expansion I/O connector enabling easy integration with existing host
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systems.
3 G/ H1 I( v) e/ l9) 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
w5 N0 G( m, Q6 w* @) CWAV3000 wireless module creates a proprietary 5 GHz wireless network for MPEG
" ~9 R& v9 e! ytransport 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
" |4 q$ y4 R+ J [0 cused as video sender, WAV3000 can be embedded in a video source device (DVD, VCR, PVR,
) \2 ^9 g7 q$ z' D! f R/ jSTB, or PC); and when used as video receiver, WAV3000 can be embedded in a video display
- O& S0 W% r5 Tdevice (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.
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The WAV3000 includes a configurable expansion connector (CEC). All I/O signals can be
# G, J0 y7 U5 ?! E. irouted 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
2 r8 K Z+ q; a5 p, m- o5 \3 jWAV3000 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
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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
% h8 v# `# L# n- 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
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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
' T/ K! A7 {# j d- Q8 y# w5 ?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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