OFDM SIGNAL PROCESSING

摘要

10A base station arrangement for forming an OFDM signal from a baseband signal includes a partitioning unit configured to partition a block of baseband signal samples into sub-blocks. A subcarrier mapper (2S) maps the sub-blocks onto adjacent sub-carrier blocks of an OFDM multi-carrier to form corresponding un-prefixed OFDM symbols. A cyclic prefix adder (24) adds a cyclic prefix to each mapped sub-block to form prefixed OFDM symbols. Phase compensators (30) perform phase compensations forcing the un-prefixed OFDM symbol part of all subsequently up-converted prefixed OFDM symbols to start at the same phase. Up-converters (34, 36) up-convert the phase compensated prefixed OFDM symbols to respective radio frequency bands having center frequencies and bandwidths that preserve the OFDM multi-carrier structure. A combiner (14) combines the up-converted phase compensated prefixed OFDM symbols into an OFDM signal.