Đang chuẩn bị liên kết để tải về tài liệu:
Orthogonal Frequency Division Multiplexing - Phân chia tần số trực giao

Không đóng trình duyệt đến khi xuất hiện nút TẢI XUỐNG Tải xuống

Pilots are transmitted first in each burst. 802.11a/g uses 4 subchannels as pilots. Some ’timeslots’ can be used as pilots. Data can be normalized by pilot components. Pilots are designed for easy detection. Pilots are used for channel estimation | Orthogonal Frequency Division Multiplexing Postgraduate Course in Radio Communications 30.11. Kari Pietikãinen kari.pietikainen@hut.fi Kari Pietikãinen Communications Laboratory HUT S-72.333 Postgraduate Course in Radio Communications di Outline OFDM - Subchannels - Pilots System overview - Coding Interleaving - Mapping - IFFT FFT - Guard time Cyclic prefix System planning example References Homework Kari Pietikãinen Communications Laboratory HUT S-72.333 Postgraduate Course in Radio Communications OFDM Multi-carrier modulation multiplexing technique Available bandwidth is divided into several subchannels Data is serial-to-parallel converted Symbols are transmitted on different subcarriers Kari Pietikãinen Communications Laboratory HUT S-72.333 Postgraduate Course in Radio .