Cyclic prefix schemes

摘要

Methods and systems are proposed for transmitting data from a source (110) to a destination (130) via a relay station (120) having multiple antennae (122, 124). The relay station (120) receives from the source a message containing the data and a first cyclic prefix. It does this using each of its antennae (122, 124), so producing multiple respective received signals. In certain embodiments, the relay station (120) removes the first cyclic prefix from the received signals, replacing it with a new one. In other embodiments, the relay station (120) removes only a portion of the first cyclic prefix. In either case, the relay station (120) may apply space-time coding to generate second signals, which it transmits to the destination (130), which extracts the data. Methods are also proposed for estimating parameters of the channel, to enable the destination (130) to decode the data.

主权项

1. A method of estimating channel state information for a wireless communication channel comprising a source, a relay station having multiple antennae and a destination, the method comprising the steps of:
a first of the antennae of the relay station receiving a first training signal from the source; a second of the antennae of the relay station receiving a second training signal from the source; the relay station: (i) encoding the first training signal and the second training signal with space-time encoding to form multiple Alamouti-coded relay training signals; and (ii) transmitting the multiple Alamouti-coded relay training signals in at least one symbol interval; and the destination receiving the relay training signals and from the Alamouti-coded relay training signals estimating the channel state information, wherein the Alamouti-coded relay training signals are also used for performing carrier frequency offset (CFO) compensation at the destination.