Block radio and adaptive arrays for wireless systems

• US 5,481,570 A
• Filed: 10/20/1993
• Issued: 01/02/1996
• Est. Priority Date: 10/20/1993
• Status: Expired due to Term

• Current Assignee: American Telephone & Telegraph Company (AT&T, Inc.)
• Original Assignee: AT&T Corporation (AT&T, Inc.)
• Inventors: Winters, Jack H.
• Primary Examiner(s): TSE, YOUNG TOI
• Application Number:
  US08/140,354
• Time in Patent Office: 804 Days
• Field of Search: 375/267, 375/347, 364/725, 364/726, 455/133-137, 455/273, 455/277.1, 455/277.2
• US Class Current: 375/347
• CPC Class Codes: H04B 7/0845 per branch equalization, e.g. by an FIR-filter or RAKE receiver per antenna branch rake receivers as such H04B1/7115

Abstract

A radio system having a master station including a wideband receiver, an A/D converter and a digital signal processing module for each of a plurality of space diversity antennas, the digital signal processing module converting the digitized samples into the frequency domain, weighting and combining the frequency domain signals from each of the antennas and separating the signals into signals corresponding to those transmitted from the remote stations.

Claims

1. In a system for effecting two-way radio transmission between a master station and plurality of remote stations, the master station including a plurality of space diversity antennas, the improvement comprising,

a. respective to each of said antennas:

i. a wideband receiver for receiving signals from multiple ones of said remote stations,

ii. an analog to digital (A/D) converter for converting the received signals into digitized samples, and

iii. a digital signal processing module including

(1) a transform module for converting said digitized samples into frequency domain signals, and

(2) a weighting module for weighting a respective one of said frequency domain signals; and

b. common to said plurality of space diversity antennas,

i. means for summing the weighted frequency domain signals,

ii. an array of inverse transform modules; and

iii. means responsive to the summed frequency domain signals for separating the weighted frequency domain signals into channel signals and for distributing said channel signals to said array of inverse transform modules.

2. A system according to claim 1 wherein each said transform module is a Fourier transform module and wherein said inverse transform modules are inverse Fourier transform modules.

3. A system according to claim 2 wherein each said weighting module filters said frequency domain signals.

4. A system according to claim 2 including means responsive to the outputs of said inverse transform modules for adjusting said weighting modules.

5. A method for effecting two-way radio transmission between a master station and plurality of remote stations, the master station including a plurality of space diversity antennas, comprising,

a. at each of said space diversity antennas:

i. receiving signals from multiple ones of said remote stations,

ii. converting the received signals into digitized samples,

iii. converting said digitized samples into frequency domain signals, and

iv. weighting respective ones of said frequency domain signals; and

b. common to said plurality of space diversity antennas;

i. summing the weighted frequency domain signals,

ii. separating the summed, weighted frequency domain signals into channel signals, and

g. converting said channel signals into time domain signals.