A 28.8Mbps 4x4 MIMO 3G High-Speed Downlink Packet Access Receiver with Normal Least Mean Square Equalization

We describe a receiver for HSDPA supporting up to 28.8 Mbps using QPSK over a 5 MHz frequency selective 4x4 MIMO wireless channel (5.76 bits/s/Hz). A key feature is the NLMS space-tiume equalizer that uses a pilot correlator for more accurate adaptation. The device is 685k effective logic gates (11.6 mm2) in 0.18mum 6LM CMOS.