| Patent Number |
Title Of Patent |
Date Issued |
| RE38603 |
Data transmitter and receiver of a spread spectrum communication system using a pilot channel |
September 28, 2004 |
| An improved spread spectrum communication system includes a transmitter and a receiver utilizing a pilot channel for the transmission of pure rather than modulated PN codes for code acquisition or tracking purposes with a lower bit error rate. The pilot signal is used to obtain initial s |
| 7269782 |
Orthogonal frequency division multiplexing/modulation communication system for improving ability |
September 11, 2007 |
| An orthogonal frequency division multiplexing (OFDM) communication system and method for improving frequency utilization efficiency. In the system, a Reed-Solomon encoder codes input information data, and outputs a Reed-Solomon block having a second number of Reed-Solomon symbols each |
| 7028246 |
Orthogonal frequency division multiplexing/modulation communication system for improving ability |
April 11, 2006 |
| An Orthogonal Frequency Division Multiplexing (OFDM) communiation system and method for improving frequency utilization efficiency. In the system, a Reed-Solomon encoder codes input information data, and ouputs a Reed-Solomon block having a second number of Reed-Solomon symbols, each |
| 6810020 |
Apparatus and method for measuring bit error rate in an OFDM communication system |
October 26, 2004 |
| Disclosed is an apparatus for measuring a bit error rate (BER) in an orthogonal frequency division multiplexing (OFDM) communication system. A transmitter includes a pilot pattern inserter for inserting a first reference pilot pattern in subchannels of input data, and an OFDM modulat |
| 6658044 |
Frequency hopping communication device and frequency hopping method |
December 2, 2003 |
| A frequency hopping (FH) communication device and a frequency hopping method are provided. The frequency hopping communication device includes a first frequency hopping unit for receiving data to be transmitted, orthogonal frequency division multiplexing (OFDM) modulating the received |
| 6593882 |
Method for processing signal of adaptive array smart antenna in array smart antenna system |
July 15, 2003 |
| There are provided adaptive beamforming algorithms for an adaptive array smart antenna. According to one embodiment of the present invention, the adaptive array smart antenna constructs an input signal matrix with a predetermined number of input signals, computes a transmission signal |
| 6522687 |
Data transmitter and receiver of a DS-CDMA communication system |
February 18, 2003 |
| A data transmitter and receiver in a DS-CDMA communication system designed to prevent a serious amplitude shift in a transmission signal, facilitate recovery of data and clock signals and relieve the constraint of using a high linearity, high performance amplifier. The data transmitter i |
| 6396869 |
Modulation apparatus and method using zero-crossing detection |
May 28, 2002 |
| A spread spectrum apparatus for a code division multiple access communication system maintains orthogonality between transmission signals. In the spread spectrum apparatus, a spreader combines first and second input signals with corresponding pseudo noise sequences to generate first |
| 6396823 |
Base station transceiver for frequency hopping code division multiple access system |
May 28, 2002 |
| A small and lightweight base station transceiver utilizes a plurality of low-powered time division duplexing switches instead of a single high-powered time division duplexing switch. The base station transceiver includes a forward signal path, a reverse signal path, and a plurality of |
| 6373879 |
Device and method for generating spread spectrum signals |
April 16, 2002 |
| A circuit and process for generating spread signals using orthogonal codes in a DS-CDMA mobile communication system. The process and circuit contemplate the use of a zero-crossing detector for detecting an I-channel signal and a Q-channel signal to generate a zero-crossing detection |
| 6246715 |
Data transmitter and receiver of a DS-CDMA communication system |
June 12, 2001 |
| A data transmitter and receiver in a DS-CDMA communication system designed to prevent a serious amplitude shift in a transmission signal, facilitate recovery of data and clock signals and relieve the constraint of using a high linearity, high performance amplifier. The data transmitter i |
| 5970055 |
Radio communication system adapting time division duplexing/frequency hopping |
October 19, 1999 |
| A radio communication system adapting TDD/FH, for reducing interference of jammer, preventing third party's hearing, and enhancing frequency usage efficiency. The radio communication system adapting time division duplexing/frequency hopping, having: a data source for providing transm |
| 5737361 |
Receiver in a direct-sequence spread-spectrum communication system using a window filter |
April 7, 1998 |
| A receiver of a direct spread spectrum communication system with a window filter implemented to provide a portion of a correlation signal to a window peak detector while the complete correlation signal is being provided to a peak detector. The receiver demodulates data received in the |
| 5729571 |
Non-coherent digital receiver of a spread spectrum communication system |
March 17, 1998 |
| A non-coherent digital receiver of a spread spectrum communication system for baseband synchronizing of a reference pseudo-noise sequence with a received pseudo-noise sequence modulated in a received spread spectrum signal. The digital receiver includes a receiving unit for translating t |
| 5724384 |
PN code sync device using an adaptive threshold |
March 3, 1998 |
| A pseudo-noise code synchronization device using an adaptive threshold in a spread spectrum receiver comprises a pseudo noise code generator, a first despread circuit, a first accumulator and dump circuit, a first squaring circuit, a first adder, a first square root-operating circuit, an |
| 5715244 |
Receiving apparatus for a base station in a code division multiple access system and signal rece |
February 3, 1998 |
| A receiving apparatus for a base station in a code division multiple access (CDMA) system performs a signal receiving method, and includes a pseudo-noise code generator that generates a pseudo-noise code corresponding to each receiving stage of a plurality of channels. A demodulator |
| 5712869 |
Data transmitter and receiver of a spread spectrum communication system using a pilot channel |
January 27, 1998 |
| An improved spread spectrum communication system includes a transmitter and a receiver utilizing a pilot channel for the transmission of pure rather than modulated PN codes for code acquisition or tracking purposes with a lower bit error rate. The pilot signal is used to obtain initial s |
| 5604732 |
Up-link access apparatus in direct sequence code division multiple access system |
February 18, 1997 |
| Disclosed is a link access apparatus of a CDMA system using a DS/SS communication method, and more particularly an up-link access apparatus which overcomes a near/far problem occurring when mobile stations and a base station perform multiple access communication using code division. An |
