Reducing Insufficient-Cyclic-Prefix Distortion Using Tone Reservation

Multicarrier modulation partitions an inter-symbol interference channel into multiple narrowband channels if the length of a cyclic prefix is longer than the channel impulse response. Otherwise, interference from the current and previous symbols cause significant distortion at the receiver. This paper proposes a low complexity approach to efficiently suppress this distortion by reserving a few tones. While the interference from the previous symbol is canceled by the receiver using the already detected symbol, the interference from the current symbol is suppressed at the transmitter by appropriately correlating transmit data tones and the reserved tones. This correlation and tone reservation cause a small data-rate loss depending on the severity of the channel conditions but overall the proposed scheme will lead to an improved performance.