Trellis-Based Receivers for SC-FDMA Transmission Over MIMO ISI Channels

For the uplink of the E - UTRA Long Term Evolution (LTE) system, Single - Carrier Frequency - Division Multiple Access (SC - FDMA) transmission has been selected. Frequency - domain linear and decision - feedback equalizers have been already given in the literature for an SC - FDMA transmission over a Multiple - Input Multiple - Output (MIMO) InterSymbol Interference (ISI) channel. In this paper, a soft - output trellis - based equalizer is proposed, taking into account the cyclic ISI structure arising in SC - FDMA, which is especially suited for turbo - encoded transmission over channels with low - to - moderate Signal - to - Noise Ratios (SNRs).