Browsing by Author "Kao, Chien-Yu"

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Extrinsic Data Compression Method for Double-Binary Turbo Codes
(2012)
Ou-Yang, Yi-Huan
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Kao, Chien-Yu
;
Hsu, Jen-Yuan
;
Ting, Pang-An
;
Lee, Chen-Yi
This paper presents an extrinsic data compression method for double-binary turbo codes. Frame and extrinsic data memory occupy more area in turbo decoder implementations with the frame size increasing. Besides, non-binary turbo codes have much more extrinsic memory usage than single-binary turbo codes. This proposed compression method utilizes an operation in radix-4 single-binary turbo decoder and also can simplify the integration of single and double-binary turbo decoders in hardware implementations. It can reduce one-third of extrinsic memory size, about 15% of total memory usage. Simulation results show that this method only causes 0.2dB performance loss when bit error rate is equal to 10-5 with slight hardware increment.
Reduced Complexity MIMO Equal Gain Precoding
(2009)
Tsai, Shang-Ho
;
Ting, Pang-An
;
Chen, Cheng-Ming
;
Kao, Chien-Yu
;
電控工程研究所
We propose a simple search algorithm to reduce the computational complexity and power consumption for equal gain precoder. Simulation results show that the equal gain precoder with the proposed search algorithm can achieve nearly the same performance as that of the Grassmannian precoder. The proposed search algorithm shows several advantages in practical implementation as will be explained later in this paper.