Wideband multi-protocol wireless radio transceiver system

• US 7,020,451 B2
• Filed: 12/02/2002
• Issued: 03/28/2006
• Est. Priority Date: 11/03/2000
• Status: Expired due to Term

• Current Assignee: North & South Brother Pharmacy Investment Company Limited (Kit Mo,)
• Original Assignee: Cognio, Inc. (Cisco Systems, Inc.)
• Inventors: Sugar, Gary L., Seed, William R.
• Primary Examiner(s): Trinh, Sonny
• Assistant Examiner(s): Bhattacharya, Sam
• Application Number:
  US10/065,934
• Publication Number:
  US 20030054788A1
• Time in Patent Office: 1,212 Days
• Field of Search: 455/69, 455/84, 455/522, 455/73, 455/76, 455/78, 455/82, 455/83, 455/324, 455/319, 455/323, 455/337, 370/311, 370/321, 370/336, 370/347, 370/252, 370/370, 370/466, 370/442, 375/295, 375/296, 375/297, 375/219
• US Class Current: 455/323
• CPC Class Codes: H04B 1/0003 Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain digital baseband systems H04L25/00; digital modulation/demodulation H04L27/00; CDMA H04B1/707; TDMA H04B7/2643; image transmission H04N5/00
• CPC Class Codes: H04B 1/001 Channel filtering, i.e. selecting a frequency channel within the SDR system multiplexing of multicarrier modulation signals being represented by different frequencies H04L5/06; multiplexing of multicarrier modulation signals H04L5/023
• CPC Class Codes: H04B 1/0017 Digital filtering H04B1/001 takes precedence; digital filters per se H03H17/00
• CPC Class Codes: H04B 1/0021 Decimation, i.e. data rate reduction techniques H04B1/0025 takes precedence
• CPC Class Codes: H04B 1/0092 using a wideband front end
• CPC Class Codes: H04B 1/406 with more than one transmission mode, e.g. analog and digital modes
• CPC Class Codes: H04B 1/525 with means for reducing leakage of transmitter signal into the receiver

Abstract

A wideband radio transceiver system that features a wideband RF section and a flexible and scalable baseband signal processing section. The transceiver system architecture has configurable baseband processing to process signals for multiple communication protocol standards, or multiple instances of the same communication protocol standard, that operate over the same frequency band. Optional additional features include a transmit carrier suppressor and transmit interference canceller to suppress the effects of a transmit signal on receive signal processing when signals are being transmitted and received simultaneously.

Claims

1. A radio transceiver system for communication of signals occurring in multiple channels in a frequency band, the system comprising:

a radio transceiver that downconverts energy in the frequency band including energy in the multiple channels and produces a baseband receive signal representative thereof, and that upconverts a plurality of transmit signals each to be transmitted in a corresponding one of the multiple channels in the frequency band;

an analog-to-digital converter (ADC) coupled to the radio transceiver that converts the baseband receive signal to a digital receive signal;

a digital-to-analog converter (DAC) coupled to the radio transceiver that converts digital transmit signals to analog transmit signals for upconversion by the radio transceiver; and

a baseband signal processing section coupled to the ADC and to the DAC that baseband demodulates the digital receive signal to recover multiple receive data associated with corresponding channels in the frequency band and that modulates multiple transmit data to produce digital transmit signals for processing by the DAC and transmission by the radio transceiver in corresponding channels in the frequency band, wherein the baseband signal processing section performs baseband modulation according to a communication protocol for each of multiple transmit data for transmission by the radio transceiver in corresponding channels in the frequency band, and performs baseband demodulation according to the communication protocol of the digital receive signal representing receive signals for corresponding channels in the frequency band, to thereby simultaneously support multiple channels in the frequency band of the same communication protocol.

2. The system of claim 1, wherein the baseband signal processing section performs baseband modulation and baseband demodulation to simultaneously support multiple channels of the same wireless location area network (WLAN) communication protocol in the frequency band.

3. A method for communication of signals occurring in multiple channels in a frequency band, comprising:

downconverting energy in the frequency band including energy in multiple channels in which multiple signals are transmitted in accordance with the same communication protocol and producing a baseband receive signal representative thereof;

converting the baseband receive signal to a digital receive signal;

baseband demodulating the digital receive signal that represents receive signals for corresponding channels in the frequency band according to the communication protocol to recover multiple receive data, each receive data associated with a corresponding channel in the frequency band;

baseband modulating each of multiple transmit data according to the communication protocol to produce a plurality of digital transmit signals to be simultaneously transmitted in corresponding channels in the frequency band according to the same communication protocol, to thereby simultaneously support multiple channels in the frequency band of the same communication protocol;

converting the plurality of digital transmit signals to analog transmit signals for upconversion by the radio transceiver; and

upconverting the plurality of analog transmit signals each to be transmitted in a corresponding one of the multiple channels in the frequency band.

4. The method of claim 3, wherein modulating comprises modulating multiple transmit data according to the same wireless local area network (WLAN) communication protocol, and demodulating comprises demodulating the digital receive signal according the WLAN communication protocol.