Method for resource allocation in synergetic OFDM system

Abstract

The invention provides a method aiming at the overall consideration and complexity of an uplink in a synergetic OFDM (orthogonal frequency division multiplexing) system for the resource allocation in a synergetic OFDM system. The method is characterized in that relays with the number thereof being a positive integer are arranged between a subscriber and a base station and each relay is provided with a plurality of subcarriers with the number being identical with that of the relays. The method comprises the following steps: firstly, the base station selects a relay according to the minimum equivalent signal-to-noise ratios of the subcarriers in each relay, that is, the base station selects the relay with the maximal equivalent signal-to-noise ratio of the subcarriers from the relays with the minimal equivalent signal-to-noise ratio of the subcarriers as the relay node for the subsequent synergetic transmission; then, the selected relay sequences the subcarriers between the subscriber and the selected relay and between the subscriber and the base station sequentially pair the subcarriers, namely, the subcarriers of the relay with high signal-to-noise ratio are used for transmitting the data supposed to be transmitted by the subcarriers of the subscriber with high signal-to-noise ratio; and finally, the base station carries out the water-filling power allocation on each intra-subcarrier according to the equivalent channel gain of each subcarrier pair, and starts the synergetic transmission.

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