Methods and systems for frequency shift keyed modulation for broadband ultra wideband communication

• US 20050220173A1
• Filed: 03/14/2005
• Published: 10/06/2005
• Est. Priority Date: 03/12/2004
• Status: Abandoned Application

• Current Assignee: Conexant Systems Incorporated (Synaptics Incorporated)
• Original Assignee: Conexant Systems Incorporated (Synaptics Incorporated)
• Inventors: Zyren, James G., Seals, Michael J.
• Application Number:
  US11/078,721
• Publication Number:
  US 20050220173A1
• Time in Patent Office: Days
• US Class Current: 375/130
• CPC Class Codes: H04B 1/715 Interference-related aspects
• CPC Class Codes: H04B 1/719 Interference-related aspects
• CPC Class Codes: H04B 2001/7154 with means for preventing interference
• CPC Class Codes: H04L 27/18 Phase-modulated carrier systems, i.e. using phase-shift keying H04L27/32 takes precedence

Abstract

A system and method for transmitting a UWB or WB signal over a wireless network using a CP-FSK modulated carrier waveform. The system and method comprises selecting a wireless communication channel that is free of at least one of interference and multipath distortion and transmitting a CP-FSK modulated signal over the selected channel having a modulation index of ≦0.707, a bandwidth of at least 500 MHz, a power spectral density of ≦−41.3 dBm/MHz, and a frequency range of 3.1 GHz to 10.6 GHz.

Claims

1. A method for transmitting data over a wireless network comprising:

scanning at least one of a plurality of wireless channels for RF energy above a threshold power level, said RF energy indicative of other interfering devices operating on the at least one channel;

selecting at least one channel that does not have interfering RF energy above the threshold level;

determining if at least one selected channel suffers from multi-path distortion; and

transmitting a CP-FSK modulated information signal on at least one channel that is determined not to suffer from multi-path distortion, where the transmitted signal has a power spectral density of ≦

−

41.3 dBm/MHz.

2. The method of claim 1, wherein the wireless channel is a UWB channel in the frequency range of 3.1 GHz to 10.6 GHz.

3. The method of claim 1, wherein the wireless channel is a WB channel in the frequency range of 5.925 GHz and 7.250 GHz.

4. The method of claim 1, wherein transmitting comprises transmitting a signal having a bandwidth of at least 500 MHz.

5. The method of claim 1, wherein transmitting comprises transmitting a signal having a bandwidth of at least 50 MHz.

6. The method of claim 1, wherein scanning at least one of a plurality of wireless channels comprises scanning the at least one channel for RF energy above a threshold power level, determining if the scanned channel suffers from multi-path distortion if there is no RF energy above the threshold level, and scanning a different channel if such RF energy is present.

7. The method of claim 1, further comprising increasing the signal bandwidth of the transmitted signal if the scanned channel and at least one adjacent channel are free of at least one of interfering RF energy and multi-path distortion.

8. The method of claim 1, transmitting further comprising transmitting a CP-FSK modulated information signal waveform with a modulation index of ≧

0.707.

9. A wireless transmitter comprising:

a CP-FSK modulator;

an amplifier; and

a control circuit causing the transmitter and amplifier to select a channel and output a signal over the selected channel having a frequency spectrum between 3.1 and 10.6 GHz with a bandwidth of at least 500 MHz and a power spectral density of ≦

−

41.3 dBm/MHz.

10. The wireless transmitter of claim 9, wherein the frequency spectrum of the output signal is between 5.925 GHz and 7.250 GHz.

11. The wireless transmitter of claim 9, wherein the bandwidth of the output of signal is at least 50 MHz.

12. The wireless transmitter of claim 9, wherein the control circuit is adapted to cause the transmitter to scan for at least one of a plurality of wireless data channels having interfering RF energy below a threshold power level and determine if at least one of channel not having interfering RF energy suffers from multi-path distortion.

13. The wireless transmitter of claim 12, wherein the control circuit is further adapted to scan a different channel if at least of interfering RF energy and multi-path distortion are detected.

14. The wireless transmitter of claim 9, wherein the control circuit is adapted to increase a signal bandwidth of the output signal if the selected channel and at least one adjacent channel are sufficiently free of at least one of interference and multipath distortion.

15. The wireless transmitter of claim 9, wherein the modulator modulates a signal waveform with a modulation index of ≧

0.707

16. A wireless communication system comprising:

a wireless transmitter; and

a wireless receiver, wherein the wireless transmitter is adapted to select a channel and to transmit a CP-FSK-modulated information signal having a bandwidth of at least 500 MHz and a power spectral density of ≦

−

41.3 dBm/MHz over the selected channel, and the wireless receiver is adapted to receive and demodulate and recover the information signal.

17. The system of claim 16, wherein the transmitter is further adapted to select at least one channel from a plurality of available channels that does not have any interfering RF energy above a threshold power level and that does not suffer from multi-path distortion.

18. The system of claim 17, wherein the transmitter is further adapted to increase a signal transmission bandwidth if the selected channel and at least one adjacent channel are sufficiently free of at least one of interfering RF energy and multi-path distortion

19. The system of claim 16, wherein the communication channel is a UWB channel in the frequency range of 3.1 GHz to 10.6 GHz.

20. The system of claim 16, wherein the communication channel is a WB channel in the frequency range of 5.925 GHz and 7.250 GHz and having a minimum bandwidth of 50 MHz.

21. The system of claim 16, wherein the CP-FSK modulated information signal has a modulation index of ≧

0.707.