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CXD1968AR 参数 Datasheet PDF下载

CXD1968AR图片预览
型号: CXD1968AR
PDF下载: 下载PDF文件 查看货源
内容描述: DVB -T解调器 [DVB-T Demodulator]
分类和应用:
文件页数/大小: 97 页 / 746 K
品牌: SONY [ SONY CORPORATION ]
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CXD1968AR  
Channel Correction (CHC)  
This block uses the estimated channel frequency response to equalize the carriers against frequency  
selective attenuation in the channel.  
TPS Cell Decode and Frame Synchronization (TPS)  
The Transmission Parameter Signaling (TPS) pilots convey information used to configure the receiver and  
delimit the COFDM frame boundaries. This block decodes the TPS pilot carriers and generates frame  
synchronization signals. All the TPS information (shown below) is readable via I2C registers.  
‹ Length indicator – Needed to read Cell-ID and reserved TPS bits  
‹ Frame number within superframe (0-3)  
‹ Constellation (QPSK, 16QAM, 64QAM)  
‹ Hierarchy information (non-hierarchical, α = 1, α = 2, α = 4)  
‹ High priority stream code rates (1/2, 2/3, 3/4, 5/6, 7/8)  
‹ Low priority stream code rates (1/2, 2/3, 3/4, 5/6, 7/8)  
‹ Guard interval (1/32, 1/16, 1/8, 1/4)  
‹ Transmission mode (2K, 8K)  
‹ All TPS bits reserved for future use (S40-S53), such as Cell ID and DVB-H indicator bits  
Symbol Deinterleaver (SDI)  
The transmitter interleaves the QAM symbols to ensure that a given QAM symbol is mapped to a different  
carrier in each COFDM symbol, to avoid a succession of errors at the Viterbi decoder input due to  
frequency selective attenuation involving several adjacent carriers. The symbol deinterleaver deinterleaves  
the corrected carriers from the channel estimation and correction blocks together with the reliability  
information.  
Symbol Demapper (DMP)  
The demapper processes the complex symbols and reliability information issued from the symbol  
deinterleaver, generating weighted soft decision information for each bit.  
Bit Deinterleaver (BDI)  
Depending upon the QAM level used, the transmitter splits up the input data bits into 2, 4 or 6 streams  
which are then interleaved to ensure that consecutive input data bits are not mapped to the same QAM  
symbol. The bit deinterleaver reverses this process by deinterleaving the soft decision information for each  
bit from the Symbol Demapper. In hierarchical mode, this block outputs a high priority and low priority bit  
stream. In non-hierarchical mode, a single bit stream is output.  
Low/High Priority Stream Select  
For hierarchical transmissions, this block selects (via an I2C register) either the high priority or low priority  
transport stream for processing by the remainder of the decoder as shown in Fig. 2.  
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