Abstract: In one embodiment, an HSDPA co-processor for 3GPP Release 6 Category 8 (7.2 Mb/s) HSDPA that provides all chip-rate, symbol-rate, physical-channel, and transport-channel processing for HSDPA in 90 nm CMOS. The co-processor design is scalable to all HSDPA data rates up to 14 Mb/s. The coprocessor implements an Advanced Receiver based on an NLMS equalizer, supports RX diversity and TX diversity, and provides up to 6.4 dB better performance than a typical single-antenna rake receiver. Thus, 3GPP R6 HSDPA functionality can be added to a legacy R99 modem using an HSDPA co-processor consistent with embodiments of the present invention, at a reasonable incremental cost and power.

Abstract: In one embodiment, an OFDM transmitter generates sets of frequency-domain data symbols from a stream of digital data. For each set of frequency-domain data symbols generated, the transmitter generates a corresponding set of frequency-domain pilot symbols. Each corresponding set of data symbols and pilot symbols are then multiplexed onto a set of frequency tones, such that, at least one tone is occupied by both a data symbol and a pilot symbol. For each tone having both a pilot symbol and data symbol, the pilot symbol and data symbol are added together to form an overlaid data and pilot (ODP) tone. Each set of tones having at least one ODP tone is then transmitted to an inverse fast Fourier transform (IFFT) processor that transforms each set of tones into an ODP OFDM symbol. Each ODP OFDM symbol is then prepared for transmission using digital-to-analog conversion, cyclic prefix insertion, and RF modulation.