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參數(shù)資料
| 型號(hào)： | CE6353 |
| 廠商： | Intel Corp. |
| 英文描述： | Nordig Unified DVB-T COFDM Terrestrial Demodulator for PC-TV and Hand-held Digital TV (DTV) |
| 中文描述： | NorDig統(tǒng)一的DVB - T的COFDM地面解調(diào)器為PC - TV和手持式數(shù)字電視（DTV） |
| 文件頁數(shù)： | 13/26頁 |
| 文件大?。?/td> | 322K |
| 代理商： | CE6353 |
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CE6353
Data Sheet
13
Intel Corporation
2.9 Common Phase Error Correction
This module subtracts the common phase offset from all the carriers of the OFDM signal to minimize the effect of
the tuner phase noise on system performance.
2.10 Channel Equalization
This consists of two parts. The first part involves estimating the channel frequency response from pilot information.
Efficient algorithms have been used to track time-varying channels with a minimum of hardware.
The second part involves applying a correction to the data carriers based on the estimated frequency response of
the channel. This module also generates dynamic channel state information (CSI) for every carrier in every symbol.
2.11 Impulse Filtering
CE6353 contains several mechanisms to reduce the impact of impulse noise on system performance.
2.12 Transmission Parameter Signalling (TPS)
An OFDM frame consists of 68 symbols and a superframe is made up of four such frames. There is a set of TPS
carriers in every symbol and all these carry one bit of TPS. These bits, when combined, include information about
the transmission mode, guard ratio, constellation, hierarchy and code rate, as defined in ETS 300 744. In addition,
the first eight bits of the cell identifier are contained in even frames and the second eight bits of the cell identifier are
in odd frames. The TPS module extracts all the TPS data, and presents these to the host processor in a structured
manner.
2.13 De-Mapper
This module generates soft decisions for demodulated bits using the channel-equalized in-phase and quadrature
components of the data carriers as well as per-carrier channel state information (CSI). The de-mapping algorithm
depends on the constellation (QPSK, 16QAM or 64QAM) and the hierarchy (
α
= 0, 1, 2 or 4). Soft decisions for both
low- and high-priority data streams are generated.
2.14 Symbol and Bit De-Interleaving
The OFDM transmitter interleaves the bits within each carrier and also the carriers within each symbol. The de-
interleaver modules consist largely of memory to invert these interleaving functions and present the soft decisions
to the FEC in the original order.
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