CP-OFDM

AcronymDefinition
CP-OFDMCyclic Prefix Orthogonal Frequency Division Multiplexing
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where the nonoverlapping succession of CP-OFDM symbols simplifies the sum over m.
FBMC systems divide the spectrum into several narrow subchannels to try to address the main drawbacks of CP-OFDM: the loss in spectral efficiency because of the CP insertion, the higher out-of-band emissions, and the higher sensitivity to narrowband interference.
If the filtering stage is disabled (i.e., CP-OFDM); the impulse response maybe assumed to be ideal.
(iii) Add/remove cyclic prefix: the blue blocks carry out the insertion and extraction of cyclic extensions, which for CP-OFDM variants are added after the IFFT operation at the transmitter and removed before the FFT at the receiver.
Regarding the CP-OFDM variants, all of them will leave aside the green blocks and include the blocks in blue for the CP addition and removal.
Note that, for the CP-OFDM variants, the computation of the CP, although produced naturally by (3), actually has no computational cost because CP insertion is equivalent to copying values already computed on memory.
Complexity of CP-OFDM. The CP-OFDM transmitter may be seen as an IFFT operation, and, from (13) and (15), the costs are
With respect to the receiver, a single-tap Zero Forcing (ZF) is the simplest CP-OFDM equalization design approach.
The W-OFDM transmitter may be seen as a CP-OFDM transmitter that introduces a stage after the cyclic prefix insertion where the multicarrier symbols are filtered by a short pulse shape (K = 1).
Because of the lack of a CP, the FBMC-QAM receiver implements a Least Mean Square (LMS) equalization algorithm with L equalizer coefficients, which minimizes the minimum mean-square error (MMSE) and assumes a typical pilot-based channel estimation used in CP-OFDM systems.
For N = 4096, CP-OFDM and W-OFDM are twice less complex than FBMC-OQAM and 1.5 times less complex than P-OFDM.
The nonharmonized transceiver used here as a baseline for comparison comprises two independent transceivers able to generate either only CP-OFDM or only FBMC waveform variants.