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In LB transmission, the carrier frequency was kHz and the symbol interval was 0.1 ms.
In HB transmission, the carrier frequency was kHz and the symbol interval was 0.05 ms.
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The sample vector in the n th frame of the m th symbol interval is denoted as.
However, derivation of the statistical moments of interference is possible if the symbol interval is shorter than the CIR length, the receiver output contains ISI.
It was remarked in [25] that only one symbol interval is sufficient to let the selected users learn their effective scalar channels.
Symbol interval is 1/14 ms. TDD frame configuration 2 is used to transmit downlink data block and uplink pilots for downlink beamforming transmission are sent in the last symbol of the uplink subframe.
An upper bound on the capacity of the indoor optical wireless channel was determined in [7] for the specific case of multicarrier systems where the average optical amplitude in each disjoint symbol interval is fixed.
The received signal vector y k (n k × 1) of user k at the m th symbol interval is y k [ m ] = H k [ m ] ∑ l = 1 K T l [ m ] b l [ m ] + n k [ m ], (1).
The discrete-time signal component at the combiner output for desired user l in the ith symbol interval is denoted as {y}_c^{(l)}(i)={displaystyle sum_{n=1}^N}{y }_n^{ l}(i) {w}_n^{(l)}, (10 where ( {w}_n^{(l)} ) is the equivalent combining weight of the nth subcarrier for desired user l. ( {y}_n^{(l)}(i) ) represents the discrete-time equivalent of (8).
However, channel variation during the successive symbol intervals is allowed.
Assuming further that the data and noise from different OFDM symbol intervals are uncorrelated, we can show that R ̃ ( c ) = E d [ j 0 ], …, d [ j V - 1 ] { i ̃ i ̃ H } + E z ̃ { z ̃ z ̃ H }, = D { R [ j 0 ], …, R [ j V - 1 ] }, (29).
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