Exact(6)
The filter blocks were designed for a channel delay spread length of 64 time domain samples and a SNR of 15 dB.
Three filter blocks have been designed for a channel delay spread length of 16 time domain samples and SNR values of 15, 25 and 60 dB.
A working SNR of 5 dB has been considered and the bit error rate (BER) after Viterbi decoding for various channel delay spread length L of time domain samples has been measured.
In Figure 14, the variation of RMSE versus channel delay spread for filter block designed for a channel delay spread length of 64 time domain samples, SNR =15 dB and for various interpolation length Q is given.
The performance obtained with the interpolation filter optimized for a channel delay spread length of N / (4F e ) time domain samples is of particular interest as it demonstrated the limitations of the proposed scheme.
where H k is the channel impulse response (CIR) matrix of the k th user and n i is the additive white Gaussian noise (AWGN) vector with zero-mean and variance σ n 2. The NPK × NPK channel matrix H k is a circulant matrix formed by cyclically shifting the zero-padded length-NPK vector of the k th user CIR h k = [ h 0 k h 1 k ⋅ ⋅ ⋅ h L - 1 k ] T, where L is the channel delay spread length.
Similar(2)
To conclude this section, a set of filter blocks for a channel delay spread lengths of 16, 32 and 64 time domain samples at a SNR =15 dB and with Q=8 has been optimized.
Also, for the sake of simplicity, we now assume a maximum spreading length (in time domain, ).
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