In options trading, a bull spread is a bullish, vertical spread options strategy that is designed to profit from a moderate rise in the price of the underlying security.
Because of put–call parity, a bull spread can be constructed using either put options or call options. If constructed using calls, it is a bull call spread (alternatively call debit spread). If constructed using puts, it is a bull put spread (alternatively put credit spread).
Generally, spread spectrum is defined as using more spectrum (or bandwidth) than is needed to transmit a signal. But according to this definition, even TCP-IP would be a spreading scheme because it retransmits packets upon receiving a NACK. In OFDM, if you interleave data across the subcarriers...