Radio transmitting apparatus, radio receiving apparatus, radio transmitting method, and radio receiving method

A radio system comprising:

• spreading means for subjecting data to be transmitted to spectrum spreading modulation processing using a spread code sequence and producing thereby a spread signal;
• impulse generating means for generating an impulse signal corresponding to said spread signal;
• delaying means for delaying said impulse signal by a time equal to a reciprocal of a frequency f of a signal from another radio transmitting apparatus that can cause interference in a signal transmitted by the radio transmitting apparatus;
• subtracting means for subjecting the delayed impulse signal and said impulse signal to subtraction processing and producing an output signal;
• transmitting means for transmitting the output signal after the subtraction processing, wherein the frequency f of the transmitted output signal is attenuated sufficiently to avoid interference with a signal transmitted by said another radio transmitting apparatus;
• and
• a receiver for receiving the radio signal, the receiver having a receive delay circuit for delaying the radio signal by 1/f to produce a delayed radio signal, and a receive subtraction circuit for adding an opposite phase radio signal to the delayed radio signal.

A method for transmitting a radio signal over a first radio transmission system using an impulse signal sequence for reducing narrowband interference caused by interference with a signal at a frequency f produced by a second radio transmitting system, the method comprising:

• generating a delayed signal by delaying a signal formed of the impulse signal sequence by 1/f second;
• generating a subtraction signal by subtracting said delayed signal from the signal formed of the impulse signal sequence;
• transmitting the subtraction signal wherein the frequency f of the transmitted signal is attenuated sufficiently to avoid interference with a signal transmitted by said second radio transmitting system;
• receiving the subtraction signal to form a received signal;
• delaying the received signal by 1/f to produce a delayed received signal;
• and
• adding a signal opposite in phase to delayed received signal to the received signal.

A method for communicating data over a network, comprising:

• subjecting data to be transmitted to spectrum spreading modulation processing using a spread code sequence and obtaining a spread signal;
• generating an impulse signal corresponding to said spread signal;
• delaying said impulse signal by a time equal to a reciprocal of a frequency f of a signal from another radio transmitting apparatus that can cause interference with a transmitted signal;
• subjecting the delayed impulse signal and said impulse signal to subtraction processing and producing an output signal;
• transmitting the output signal from the subtraction processing such that the frequency f of the transmitted output signal is attenuated sufficiently to avoid interference with a signal transmitted by said second radio transmitting system;
• and
• receiving the output signal to form a received signal;
• delaying the received signal by 1/f to produce a delayed received signal;
• and
• adding a signal opposite in phase to the delayed received signal to the received signal.