Industrial Technology Research Institute

Taimide Tech. Inc.

Jia-Hao Wu

Pang-An Ting

Yu-Tao Hsieh

Lai-Huei Wang

Chin-Hung Chen

Ming-Che Lin

Chao-Kai Wen

Jiun-Yo Lai

Yung-Yih Jian

Yu-Chen Lai

Yun-Yi Shih

A method of making a graphite film is provided. The method is characterized in that a polyimide film is used as a precursor, and a carbonizing heat treatment is performed, in which the carbonizing temperature ranges from 500 to 800 degrees Celsius and the heating rate is equal to or lower than 2 degrees Celsius per minute. The highest carbonizing temperature is equal to or higher than 1000 degrees Celsius. The method is also characterized in that the graphitizing temperature ranges from 2200 degrees temperature to the highest graphitizing temperature in which the average heating rate is equal to or lower than 3 degrees Celsius per minute. The highest graphitizing temperature is equal to or higher than 2500 degrees Celsius.

Method of making a graphite film

A method for generating a pilot pattern for data to be transmitted in an orthogonal frequency-division multiplexing (OFDM) based communication system includes: allocating pilot symbols for a plurality of data streams to form a plurality of pilot clusters in the pilot pattern, wherein each of the pilot clusters includes ones of the pilot symbols, the ones of the pilot symbols being for respectively different ones of the data streams.

System and method for pilot design

A transmitter and the method therefor are provided. The transmitter is applied in an orthogonal frequency division multiplexing (OFDM) based or other multicarrier communication systems. The transmitter uses N sub-carriers. Among the N sub-carriers, L sub-carriers (or tones) are reserved for PAPR reduction. L is less than N. The method includes the following steps. Original frequency domain data symbols are generated and fed into the reserved-tone symbol generation unit. The reserved-tone symbols are generated by using pure frequency domain signal processing. Then the reserved-tone symbols are combined with original data symbols to generate combined PAPR reduction signal. The resultant PAPR reduction signal can be fed into reserved-tone symbol generation unit iteratively to obtain updated reserved-tone symbols. For proper iterations, the original data symbols combined with L frequency domain reserved-tone symbols will result in lower PAPR transmit signal.

Transmitter and the method therefor

A hybrid sphere decoding method is disclosed. Received data is processed to obtain preliminary parameters. Mlayers are determined to use breadth-first search and Mlayers to use depth-first search. A search process is implemented based on the preliminary parameters, in which Mlayers are searched using breadth-first search and Mlayers are searched using depth-first search.

Hybrid sphere decoding method and system

An adaptive channel estimator for estimating channel frequency responses when receiving OFDM symbols. The adaptive channel estimator comprises a channel estimator and a channel tracking module. The channel estimator generates one first channel frequency response for each OFDM symbol when operated in the first mode, and generates the channel frequency responses of a second channel frequency response for every N-th OFDM symbols when operated in the second mode, wherein N is a constant integer exceeding one and j is a non-negative integer. The channel tracking module indicates a channel status, and controls the channel estimator to operate in a first mode or a second mode according to the channel status.

Adaptive channel estimator and adaptive channel estimation method

A method, and device implementing the method, for adaptively allocating pilot signals in a wireless communication system. The method includes receiving channel data, including channel length (L) data, inter-carrier interference power (P) data, coherence time (CT) data, and a number of subcarriers (N). The method further includes selecting, when L is greater than a first channel length threshold (L), a first number of pilot signals between a minimum value of L and a maximum number of pilot signals N, wherein the first number of pilot signals Nare equally spaced in time according to the CT data, and equally spaced in frequency. Further, the method includes selecting, when L is less than Land Pis less than a power threshold (P), a second number of pilot signals such that the second number of pilot signals is between the minimum value of L and N, wherein the second number of pilot signals are equally spaced in time according to the CT data, and equally spaced in frequency. Finally, the method includes selecting, when L is less than Land Pis greater than P, a third number of pilot signals such that the third number of pilot signals is equal to n times L (nL), wherein n is an integer, the third number of pilot signals being equally spaced in time according to the CT data, and allocated according to a cluster(n) clustered pilot scheme with a cluster size equal to n, the n-sized clusters being clustered in frequency.

Growing community of inventors

Gueishan, Taiwan

Jia-Hao Wu