Industrial Technology Research Institute

Lai-Huei Wang

Pang-An Ting

Jen-Yuan Hsu

Yu-Tao Hsieh

Chia-Lung Tsai

Jiun-Yo Lai

Jia-Hao Wu

Chia-Hung Lin

Chien-Yu Kao

Pang An Ting

A wireless communication method may include receiving a first data stream comprising a data sequence and computing a permutation sequence based on a content of the received first data stream. The permutation sequence is a non-predetermined sequence. The method may further include performing a permutation on the first data stream based on the permutation sequence to generate a permuted first data stream being configured for wireless transmission.

Communication methods and systems having data permutation

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 method for pilot design for data to be transmitted by an orthogonal frequency-division multiplexing (OFDM) based communication system, the data being represented by a plurality of OFDM symbols. The method includes allocating pilot symbols for a data stream to be included in ones of the OFDM symbols; and performing a frequency shift on at least one of the OFDM symbols, to reduce frequency distance disparities among the pilot symbols.

System and method for pilot design for data transmitted in wireless networks

A subcarrier allocation method for use by a transmitter, the transmitter being configured to, when transmitting first and second data streams, allocate pilot symbols for the first and second data streams to subcarriers, such that a first plurality of subcarriers carry the pilot symbols for the first data stream and a second plurality of subcarriers carry the pilot symbols for the second data stream. The method includes allocating, when the transmitter transmits the first data stream but does not transmit the second data stream, the second plurality of subcarriers to carry no formation or information relating to the first data stream.

System and method for subcarrier allocation and permutation

A method for removing ICI for a received symbol is provided. Firstly, a transmitted symbol is received via a wireless channel within a symbol time so as to obtain the received symbol. The transmitted symbol includes P identical original partial data, wherein P is a positive integer larger than 1. The received symbol includes P received partial data corresponding to the original partial data, respectively. Next, on a time domain at least two of the P received partial data are copied so as to obtain at least two copied partial data. Each copied partial data includes P copies of its corresponding received partial data. After that, an estimated ICI of the time domain is determined according to the product of a predetermined constant array and the difference between the copied partial data. Afterwards, the estimated ICI is subtracted from the received symbol so as to obtain an output symbol.

Wireless transmission system, receiver thereof, and method for removing inter-carrier interference thereof

An estimation method is provided for use in a receiver of an OFDM (orthogonal frequency division multiplexing) system to estimate the ICI (inter-carrier interference) and the noise power of a channel. Two pilot signals respectively carried by two subcarriers are received from the channel wherein the two pilot signals are adjacent and differ by a first phase angle. Another two pilot signals respectively carried by another two subcarrier are received from the channel wherein the another two pilot signals are adjacent and differ by a second phase angle. According to some embodiments of the invention, these phases are correlated with the ICI power, but are uncorrelated with the noise power. The estimation method then individually estimates the ICI power and noise power according to the first phase and the second phase.

Apparatus and method for estimating inter-carrier interference power and noise power in a channel

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

Bade, Taiwan

Lai-Huei Wang