Sheng-Lung Cheng Department of Communication Engineering National Chiao Tung University 2011-10-17. The Study Report of LTE Physical Layer Documents. Outline. Introduction References DL/UL transmission train Discussible topics. Introduction.
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and packet-optimized radioaccesstechnology supporting
By applying different scrambling sequences for neighboring cells, the interfering signal after descrambling is randomized, ensuring full utilization of the processing gain provided by the channel code.
DL/UL system model
The rank assignment refers to RI
The precode matrix assignment refers to
Here the W(i) is not selected by UE.
Precoding for transmit diversity
DL/UL system model
OFDM symbol timing synchronization
Radio frame timing synchronization
Cell ID determination
FD PSS and SSS
a. Using TD PSS
The length 62 FD Zadoff–Chu (ZC) sequence has bad TD performance when IFFT size is large.
a. Using CP
Downlink CRS in one antenna transmission
Some OFDM symbols may not have any data, so the observation interval would be very large.
Downlink control information , DCI, provides the terminal with the necessary information for proper reception and decoding of the downlink data transmission.
Puncturing or repetition
Control-Channel Elements (CCEs), is a convenient name for a set of 36 useful resource elements. The number of CCEs, 1, 2, 4, or 8, required for a certain PDCCH depends on the DCI payload channel-coding rate.
As the number of CCEs for each of the PDCCHs may vary and is not signaled, the terminal has to blindly determine the number of CCEs used for the PDCCH it is addressed upon.
In release 8/9, the number of blind decoding attempts is 44 per subframe, while for release 10 with uplink spatial multiplexing the number is 60.