Industrial Technology Research Institute

National Yang Ming Chiao Tung University

Yu-Ted Su

Yan-Xiu Zheng

Chien-Chun Cheng

Yen-Chih Chen

Shih-Hsien Yang

A high performance real-time turbo code system is proposed. The proposed system exploits cooperative coding architecture and a proper decoding scheduling to achieve low error rate within a constrained latency. Permutation schemes and hardware embodiments utilizing the cooperative coding are also shown. Various memory saving techniques are provided to reduce memory usage in both encoder and decoder. The proposed system is compatible with 3generation mobile standards and cost of designing new parts exclusively for the proposed system can be minimized. This invention can provide substantial coding and system capacity gains for real-time applications in a wireless environment.

Inter-sequence permutation turbo code system and operation methods thereof

A model-based channel estimator for correlated fading channels adapted to a multiple-input multiple-output (MIMO) system, estimates a coefficient vector of a channel matrix for a given angle of departure (AoD) according to a plurality of received signals, a plurality of transmit pilots, a plurality of known model orders, and a plurality of predetermined bases for exploiting time, frequency, spatial channel correlation among a transmit antenna array, and spatial channel correlation among a receive antenna array, then estimates a mean AoD based on the estimated channel matrix. The channel estimator estimates iteratively the coefficient vector and the mean AoD until a stop criterion is met. Then, it reconstructs a channel estimate by using the plurality of predetermined bases, the coefficient vector, and the mean AoD.

Model-based channel estimator for correlated fading channels and channel estimation method thereof

A method for estimating frequency offset is provided. First, a baseband signal with a preamble featuring quasi-periodic property is received. Next, the quasi-periodic property of the preamble of the received baseband signal is reconstructed by interpolation. Next, a frequency offset angle is estimated by using the reconstructed baseband signal. The accuracy of estimating frequency offset is increased because of better reconstructed quasi-periodic property of the preamble.

Growing community of inventors

Hsinchu, Taiwan

Yu-Ted Su