Abstract
This paper shows a new DWT based OFDM algorithm which significantly simplifies signal processing in the transmitter and receiver. Unlike conventional DWT based OFDM a new algorithm does not use digital modulation of subcarriers either IDWT in the transmitter. The output signal from the transmitter is formed by summing the signals on the individual subchannels, encoded with the Manchester code and sampled at appropriate frequencies. In the receiver, the channel signal and data is reconstructed using DWT and Haar wavelet. Although the signal transmission is achieved using amplitude modulation, the paper shows that BER performance is commensurable to BPSK or DMWT based OFDM in the presence of AWGN.
Highlights
The advantages of DWT based Orthogonal frequency division multiplexing (OFDM) in comparison to FFT based OFDM are well known and the performance of such systems measured in the channels with different types of noise and digital modulation of the subcarriers as well, detailed insight into the applied transformations is usually missed
This way, a completely new, digitally coded (OFDM) subcarrier transmission appears across AM modulation scheme, with improved performance regarding the complexity of used hardware and BER performance commensurable to BPSK or DMWT based OFDM in the presence of AWGN
Orthogonal frequency division multiplexing (OFDM) is a multicarrier modulation technique which divides the available spectrum into a number of parallel subcarriers where each subcarrier is modulated by a low rate data stream at the different carrier frequency
Summary
The advantages of DWT based OFDM in comparison to FFT based OFDM are well known and the performance of such systems measured in the channels with different types of noise and digital modulation of the subcarriers as well, detailed insight into the applied transformations is usually missed. The attention is oriented to the well-known data coding procedure (a Manchester code) which revealed very interesting properties if the Haar wavelet transformation is performed under specific conditions. This way, a completely new, digitally coded (OFDM) subcarrier transmission appears across AM modulation scheme, with improved performance regarding the complexity of used hardware and BER performance commensurable to BPSK or DMWT based OFDM in the presence of AWGN.
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