Estimating one or more characteristics of a communications channel

An electronic communications device, comprising:

• a first receiver, configured to receive a first wireless signal transmitted by a transmitter at a first set of frequencies in a first time slot;
• a second receiver, configured to receive a second wireless signal transmitted by the transmitter at a second set of frequencies in a second time slot, wherein the second set of frequencies partially overlaps with the first set of frequencies and the second time slot is different from the first time slot;
• and
• a processor, configured to jointly process the first wireless signal and the second wireless signal to estimate one or more characteristics of the communications channel,
• wherein the first wireless signal has a first center-frequency and the second wireless signal has a second center-frequency, and wherein the processor is configured to jointly process the first wireless signal and the second wireless signal based on a difference between the second center-frequency and the first center-frequency.

A transmitter device, configured to:

• transmit a first wireless signal at a first set of frequencies in a first time slot;
• transmit a second wireless signal at a second set of frequencies in a second time slot, wherein the second set of frequencies partially overlaps with the first set of frequencies and the second time slot is different from the first time slot,
• wherein the first and second wireless signals are transmitted coherently,
• wherein the first wireless signal has a first center-frequency and the second wireless signal has a second center-frequency, and wherein the first wireless signal and the second wireless signal are jointly processed based on a difference between the second center-frequency and the first center-frequency.