Home // International Journal On Advances in Telecommunications, volume 5, numbers 1 and 2, 2012 // View article

Impact of Scrambling-Exact Channel Estimation on HSDPA MIMO

Authors:
Wolfgang Aichmann

Keywords: W-CDMA; HSDPA; MIMO; channel estimation; scrambling; crosstalk; interference cancellation;

Abstract:
Multiple-input Multiple-output (MIMO) antenna systems require a separate pilot signal for each transmitting antenna for enabling the receiver to measure all physical channels separately. As scrambling operates with pseudorandom sequences the auto-correlation is quasi-orthogonal with small deviations from exact orthogonality. In this paper the impact of these deviations is investigated, which is important especially for estimating the channel impulse response. Therefore, an analytical approach beyond simple correlation is proposed, taking into account the full scrambling sequence. Link level simulations show that the performance of high-speed downlink packet access (HSDPA) MIMO systems is significantly improved, especially for very high data rates when dual stream transmission is used in combination with cancellation of the interference between the data streams.

Pages: 79 to 89

Copyright: Copyright (c) to authors, 2012. Used with permission.

Publication date: June 30, 2012

Published in: journal

ISSN: 1942-2601