Performance Analysis of the 3GPP-LTE Physical Control Channels
1 Smart Antenna Research Group, Department of Electrical Engineering, Stanford University, USA
2 TIFAC CORE in Wireless Technologies, Thiagarajar College of Engineering, Madurai 625015, India
3 Beceem Communications Inc., Santa Clara, CA 95054, USA
EURASIP Journal on Wireless Communications and Networking 2010, 2010:914934 doi:10.1155/2010/914934Published: 28 November 2010
Maximum likelihood-based (ML) receiver structures are derived for the decoding of the downlink control channels in the new long-term evolution (LTE) standard based on multiple-input and multiple-output (MIMO) antennas and orthogonal frequency division multiplexing (OFDM). The performance of the proposed receiver structures for the physical control format indicator channel (PCFICH) and the physical hybrid-ARQ indicator channel (PHICH) is analyzed for various fading-channel models and MIMO schemes including space frequency block codes (SFBC). Analytical expressions for the average probability of error are derived for each of these physical channels. The impact of channel-estimation error on the orthogonality of the spreading codes applied to users in a PHICH group is investigated, and an expression for the signal-to-self interference plus noise ratio is derived for Single Input Multiple Output (SIMO) systems. Finally, a matched filter bound on the probability of error for the PHICH in a multipath fading channel is derived. The analytical results are validated against computer simulations.