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What technique does DSP use to double the number of channels by using helical antennas?

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What technique does DSP use to double the number of channels by using helical antennas?

(a) Spatial isolation

(b) Frequency reuse

(c) Multiplexing

(d) Modulation

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This interesting question is from Satellite Applications topic in division Satellite Communication of Avionics

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Correct option is (b) Frequency reuse

The explanation is: The digital signal is transmitted from the satellite to the receivers using circular polarization. The DBS satellites have right-hand and left-hand circularly polarized (RHCP and LHCP) helical antennas. By transmitting both polarities of signal, frequency reuse can be incorporated to double the channel capacity.

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