FMOD TRANSCEIVERS INCLUDING CONTINUOUS AND BURST OPERATED TDMA, FDMA, SPREAD SPECTRUM CDMA, WCDMA, AND CSMA

• US 20010002202A1
• Filed: 07/08/1998
• Published: 05/31/2001
• Est. Priority Date: 01/09/1995
• Status: Active Grant

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: FEHER, KAMILO
• Granted Patent: US 6,445,749 B2
• Time in Patent Office: Days
• US Class Current: 375/130
• CPC Class Codes: H03C 3/005 Circuits for asymmetric modulation
• CPC Class Codes: H04L 27/2032 for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
• CPC Class Codes: H04L 27/362 Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated H04L27/366 takes precedence
• CPC Class Codes: H04L 27/38 Demodulator circuits; Receiver circuits

Abstract

Binary and Quadrature Feher'"'"'s (F).-Modulation/Transmitter-Receiver (Transceiver) with reduced envelope fluctuations and peak radiation, increased efficiency delivered by baseband, intermediate frequency (IF) connected RF (radio frequency), Infrared (IR) and other devices. A subclass of these systems has a constant envelope. Power advantages, robust BER performance and linearly or nonlinearly amplified narrow spectrum without the pitfalls of conventional BPSK, DBPSK QPSK and pi/4 QPSK is attained. Feher'"'"'s FBPSK improved efficiency transmitter is compatible with conventional BPSK receivers. FBPSK modems are based on using quadrature structure where Q channel data is inserted in quadrature with I channel data for certain applications. The Q channel data is “offset” from the changed data by an amount selectable between zero (0) and a specified time. Further improvement in the spectrum is attained using correlation between I and Q channels. FBPSK modem is shown to meet the IEEE 802.11 specified spectral direct sequence spread spectrum mask (−30 dB point) for wireless LAN, and leads output power gain of 6.5 dB over BPSK modems. The Crosscoupled Quadrature Structure is also suitable continuous mode and for burst operated TDMA, FDMA, CDMA, WCDMA and CSMA Frequency Modulation Quadrature AM (QAM), pi/4-shifted QPSK modems/processors are also disclosed. Reduced modulation index Gaussian FSK (GFSK), multilevel FM and crosscoupled Quadrature Amplitude Modulated (QAM) transmitters and combinations of these modulations and corresponding coherent demodulators are disclosed. Controlled rise and fall time descriptions of burst operated systems are included.

Claims

1. A structure comprising:

a input port for receiving input data;

a splitter having an input coupled to said input port, and serving to split said input data into baseband signals; and

a baseband signal processing network for receiving said baseband signal streams and providing cross-correlated processed in phase and quadrature phase baseband signals and a spreading circuit for spreading the split baseband signals.

2. A structure as in

claim 1

which further comprises a quadrature modulator for receiving said processed in phase and quadrature phase baseband signals and providing a quadrature modulated output signal.

3. A cross correlated quadrature architecture signal processor for producing cross correlated in phase and quadrature phase signal streams for modulation by a Quadrature Modulator comprising:

a filter for receiving an input signal selected from the group of binary, multi-level, and analog signals and combinations thereof and producing a filtered input signal;

signal shaping means for integrating said filtered input signal;

an amplifier for varying the modulation index of said signal processor, said amplifier receiving said filtered input signal and providing an amplified input signal;

a splitter receiving said amplified input signal and providing cross correlated data streams; and

a signal processor having an in phase and quadrature phase channel each receiving one of said cross correlated data streams, each of said in phase and quadrature phase channel having a first delay gain filter, means for generating linearly and/or nonlinearly values for said in phase and quadrature phase channel datastream, a wave shaper and a second delay gain filter, such that said signal processor provides in phase and quadrature phase cross correlated data signals for quadrature modulation with a modulated signal adaptable for coherent demodulation of the quadrature frequency modulated (FM) signal.

4. A cross correlated quadrature architecture signal processor for producing cross correlated in phase and quadrature phase data streams for modulation by a Quadrature Modulator and subsequent BPSK or QPSK demodulation of the quadrature modulated signal comprising:

a splitter for receiving an input signal selected from the group of binary, multi-level, and analog signals and combinations thereof and providing a pair of in-phase and quadrature phase data signals; and

a signal processor including an in phase and quadrature phase channel each receiving one of said pair of data signals, each of said channels including

a delay element for receiving said one of said pair of identical data signals and producing a delayed signal in the range of zero delay to a specified value;

an amplifier for receiving said delayed signal and producing an amplified data signal;

a filter for receiving said amplified signal and producing a filtered data signal;

such that said signal processor provides in phase and quadrature phase cross correlated data signals for quadrature modulation with a modulated signal suitable for amplification in linear and non-linear mode and adaptable for BPSK or QPSK demodulation.

5. A structure comprising:

a input port for receiving a plurality of input data signals;

cross-correlator means for receiving said input data signals and for generating cross-correlated processed in phase and quadrature phase signals in response thereto.

6. A structure comprising:

an input port for receiving input signal(s);

a circuit having an input coupled to said input port and serving to said input signal(s) into baseband signal; and

a baseband signal processing circuit for receiving said baseband signals and providing cross correlated in phase and quadrature phase bandband signals.