WIRELESS MICROPHONE TRANSMITTERS RECEIVERS

Brand	Owner (click to sort)	Address	Description
COM-TEK	COMTEK COMMUNICATIONS TECHNOLOGY, INC.	357 West 2700 South Salt Lake City UT 84115	WIRELESS MICROPHONE TRANSMITTERS AND RECEIVERS FOR THE PROFESSIONAL AUDIO MARKET AND FOR ASSISTIVE LISTENING FOR THE HEARING IMPAIRED;COMTEK; COMMUNICATIONS TECHNOLOGY;
COMTEK	COMTEK COMMUNICATIONS TECHNOLOGY, INC.	357 West 2700 South Salt Lake City UT 84115	WIRELESS MICROPHONE TRANSMITTERS AND RECEIVERS FOR THE PROFESSIONAL AUDIO MARKET AND FOR ASSISTIVE LISTENING FOR THE HEARING IMPAIRED;COMMUNICATIONS TECHNOLOGY;
DIGITAL HYBRID WIRELESS	LECTROSONICS, INC.	581 Laser Road NE Rio Rancho NM 87124	Wireless microphone transmitters and receivers;DIGITAL OR WIRELESS;
DYNEX	Cetec Corporation	El Monte CA	Wireless Microphone Transmitters and Receivers;
FIRST QUALITY IN WIRELESS SOUND	COMTEK COMMUNICATIONS TECHNOLOGY, INC.	357 West 2700 South Salt Lake City UT 84115	WIRELESS MICROPHONE TRANSMITTERS AND RECEIVERS FOR THE PROFESSIONAL AUDIO MARKET AND FOR ASSISTIVE LISTENING FOR THE HEARING IMPAIRED;1ST QUALITY IN WIRELESS SOUND;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

Transmitting non-polluting dummy pilot signals in a wireless communication network permits estimation of the downlink propagation channels between a number of joint transmitters and a lesser number of receivers. With fewer receivers than transmitters, loop back information from the receivers is not sufficient to determine the downlink propagation channels between the transmitters and receivers. For N transmitters and M receivers, (N-M) dummy pilot symbols are transmitted to facilitate downlink channel estimation. Each dummy pilot signal is transmitted to an imagined or dummy receiver that is virtually located such that its downlink channel coefficient vector is orthogonal to those of the real receivers. Transmit pre-filtering based on estimated propagation channels is applied to the information signals for the real receivers and to the dummy pilot signals. The extent to which the dummy pilot signals interfere at each receiver is an indication of mismatch between estimated and actual propagation channels.