Space and latency-efficient HSDPA receiver using a symbol de-interleaver

摘要

A method at a mobile device, the method comprising: receiving one or more data symbols; determining reduced symbols for each of the data symbols, the reduced symbols corresponding to each of at least two orthogonal components of the data symbols; and, storing the reduced symbols in a symbol buffer.

主权项

1. A method at a mobile device, the method comprising:
de-spreading one or more data symbols to produce de-spread data symbols, each data symbol representing respective data encoded as a respective quadrature amplitude modulated ‘QAM’ symbol; determining reduced symbols based on the de-spread data symbols, each reduced symbol comprising:
a respective first pulse amplitude modulated ‘PAM’ symbol representing a respective PAM data symbol for an in-phase component of a respective data symbol, anda respective second pulse amplitude modulated ‘PAM’ symbol representing a respective PAM data symbol for a quadrature component of the respective data symbol,wherein the in-phase component of the respective data symbol and the quadrature component of the respective data symbol indicate independent data; storing, prior to modulation demapping to determine soft decisions from the reduced symbols, the reduced symbols in a symbol buffer; while storing the reduced symbols in the symbol buffer and prior to performing the modulation demapping, estimating QAM amplitudes of the de-spread data symbols; after the storing, de-interleaving the reduced symbols to produce de-interleaved reduced symbols; performing, based on the estimating QAM amplitudes, the modulation demapping on the de-interleaved reduced symbols to produce soft decisions; performing constellation de-arrangement of the soft decisions; and based on performing the constellation de-arrangement, performing rate de-matching and HARQ combining of the soft decisions.