Korea Electronics Technology Institute

Min-Chul Ju

Jin-Woong Cho

Cheol-Hee Park

Myoung-Jin Kim

Kyeung-Hak Seo

Young-Hwan You

Young Hwan You

Jong Ho Paik

Sung-Jin Kang

Kee-Hyun Park

Dae-Ki Hong

A constant amplitude coded bi-orthogonal demodulator demodulates the received constant amplitude bi-orthogonal modulated data, cancels the parity bits to generate the serial data, detects the occurrence of an error by dividing the demodulated data into a plurality of groups of data, outputs the serial data as demodulated data if an error does not occur, sequentially converts bit polarities of data of groups in which an error occurs if the error detector detects the error, compares distances between the received bi-orthogonal modulated data and the constant amplitude coded bi-orthogonal modulated data, and selects, as demodulated data, data of which corresponding bit polarities are changed according to the comparison results. According to the present invention, power consumption is reduced, a power amplifier can be manufactured at an inexpensive cost, interference robustness can be ensured, and data can be transmitted at a high transmission rate and a variable transmission rate.

Apparatus for constant amplitude coded bi-orthogonal demodulation

The present invention relates to an adaptive frequency hopping apparatus in a wireless personal area network (WPAN) system, wherein predetermined packets of data can be correctly transmitted by estimating the channel qualities of operating bands in advance and transmitting the packets through a proper band.

Adaptive frequency hopping apparatus in wireless personal area network system

An apparatus for compensating a channel distortion in a Bluetooth system to process a received signal having access codes comprises a multiplier for multiplying the received signal by a previously obtained channel distortion compensation signal to thereby provide a multiplied signal; a demodulator for demodulating access codes of the multiplied signal to thereby output demodulated received access codes as a demodulated signal; a correlation detection circuit for detecting correlation values between the demodulated received access codes and the access codes of the received signal previously stored therein to detect a start point of the received signal, thereby providing detected access codes having corresponding correlation values greater than a predetermined threshold and providing an enable signal if there are one or more correlation values greater than the predetermined threshold; and a channel distortion compensation circuit for performing a channel distortion compensation based on the detected access codes and a reference signal obtained by re-modulating the access codes of the received signal in response to the enable signal to thereby provide a channel distortion compensation signal.

Apparatus for compensating a channel distortion in a bluetooth system

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Kyeonggi-do, South Korea

Min-Chul Ju