Richard B Ertel, 544130 E Mathews Way, Salt Lake City, UT 84124

6956838, Oct 18, 2005

Apr 13, 2001

09/834667

Richard B. Ertel - Midvale UT, US
Thomas R. Giallorenzi - Riverton UT, US
Eric K. Hall - Holliday UT, US

L-3 Communications Corporation - New York NY

H04B007/216

370334, 370339, 370342

A method is disclosed for operating a synchronous space division multiple access, code division multiple access communications system, as is a system that operates in accordance with the method. The method operates, within a coverage area of a base station (BS), to assign the same spreading code to a plurality of subscriber stations (SSs) and to transmitting signals to, and receive signals from, the SSs using an antenna array having M elements, where M>1 and where the M elements are spaced apart by more than one-half wavelength from one another. The spacing is a function of a size of an aperture of the antenna array which is a function of a signal bandwidth to carrier frequency ratio. The antenna array aperture is preferably less than k=p/360*fc/B wavelengths, where p is a maximum acceptable phase variation over the signal bandwidth, where fc is the carrier frequency and where B is the signal bandwidth. The step of conducting communications includes steps of despreading a plurality of received signals; and beamforming the plurality of despread received signals. In a preferred embodiment individual ones of P orthogonal spreading codes are reused αM times within the coverage area, where 1/M

6999446, Feb 14, 2006

Oct 26, 2001

10/039514

Eric K. Hall - Sandy UT, US
Thomas R. Giallorenzi - Riverton UT, US
Richard B. Ertel - Sandy UT, US
Lee A. Butterfield - West Jordan UT, US
Dan M. Griffin - Bountiful UT, US
Philip L. Stephenson - Salt Lake City UT, US

L-3 Communications Corporation - New York NY

H04J 3/24

370349, 370350

A method is disclosed for operating a wireless communications system, such as a DS-CDMA communications system, by transmitting a waveform that includes a plurality of repeating frames each having x header training base symbols in a header training symbol field (TH) and y tail training base symbols in a tail training symbol field (TT). The frame is received and functions as one of a plurality of different types of frames depending on the content of at least TT. In the preferred embodiment the frame functions as one of a normal traffic frame, a termination frame, or a legacy frame providing backwards compatibility with another waveform. A given one of the frames includes four equal-size data fields separated by three equal-sized control fields, the header training symbol field (TH) and the tail training symbol field (TT).

7031290, Apr 18, 2006

Oct 24, 2001

10/037420

Richard B. Ertel - Midvale UT, US
Thomas R. Giallorenzi - Riverton UT, US
Eric K. Hall - Sandy UT, US

L3 Communications Corporation - New York NY

H04B 7/216

370342, 370335

A method is disclosed for operating a synchronous space division multiple access, code division multiple access communications system. The method operates, within a coverage area of a base station (BS) or radio base unit (RBU) having a multi-element antenna array, to assign spreading codes to users. The method estimates a spatial signature vector (SSV) for a current subscriber station; uses the estimated SSV as a weight vector when determining the output power that is correlated with each of a plurality of spreading code sequences and assigns a spreading code to the current subscriber station that is determined to have the minimum output power. The step of determining the output power includes steering a beamformer toward the current subscriber station by setting the weight vector equal to the SSV, and also determines the average squared value of the antenna array output that has been despread using a code i. The multi-element antenna array has M elements, and the step of determining the output power operates an M-branch receiver to despread a signal received on each element with a spreading code i, to accumulate the despread signal over a symbol duration, to scale the accumulated signal by the weight vector, to sum all of the scaled values and to square the result, and to average the squared result over R samples to determine the output power for code i for the current subscriber station. R may have a value in the range of about 16 symbols to about 64 symbols, and may be fixed or variable.

7050480, May 23, 2006

Oct 24, 2001

10/037423

Richard B. Ertel - Midvale UT, US
Thomas R. Giallorenzi - Riverton UT, US
Eric K. Hall - Holliday UT, US

L3 Communications Corporation - New York NY

H04B 1/69
H04B 1/707
H04B 1/713

375141, 375130, 375146, 375147, 370310, 370329, 4555621

A method is disclosed for operating a synchronous space division multiple access, code division multiple access communications system. The method operates, within a coverage area of a base station (BS) or radio base unit (RBU) having a multi-element antenna array, for estimating a SSV for individual ones of a plurality of active subscriber stations (SSs) and assigns a spreading code to a subscriber station (SS) that minimizes the similarity of the determined SSVs of the SSs in a spreading code set. A metric used to measure the similarity of the spatial signature vectors of the SSs comprises the squared sum of the inner products of same code SSs' SSV with a current SS's SSV. The step of assigning includes calculating the magnitude of the squared inner product of the SSVs of all pairs of active SSs; using the calculated values for determining ξ(c) for each spreading code that is not already used some specified maximum number of times; and assigning to a SS the spreading code with a minimum ξ(c).

7054286, May 30, 2006

Apr 9, 2001

09/829092

Richard B. Ertel - Midvale UT, US
Eric K. Hall - Holliday UT, US
Thomas R. Giallorenzi - Riverton UT, US
Philip L. Stephenson - Salt Lake City UT, US
Johnny M. Harris - Centerville UT, US
Edward P. Newren - Woods Cross UT, US

L-3 Communications Corporation - New York NY

H04Q 7/00

370329, 370335

This invention provides a highly flexible multiplexing scheme for Direct Sequence CDMA systems enabling the CDMA system to flexibly allocate CDMA channel resources between packet-switched broadcast channels and fast-circuit-switched dedicated channels in order to optimize system throughput. A method and system are provided for operating a communication system. The method has steps of: flexibly allocating CDMA channel resources between packet-switched broadcast channels and fast-circuit-switched dedicated channels in order to optimize system throughput, and employing a side channel as required to send all or a part of a total amount of data, depending on the total amount of the data. A bandwidth allocation scheme allocates a set of CDMA channels for burst packet-switched channels, and data is time division multiplexed over the set of burst CDMA channels providing a wide bandwidth data pipe for packet-switched data. Subscriber stations are equipped with multiple CDMA channel receivers tuned to the burst CDMA channels.

7054292, May 30, 2006

Apr 12, 2001

09/833720

Eric K. Hall - Holliday UT, US
Thomas R. Giallorenzi - Riverton UT, US
Richard B. Ertel - Midvale UT, US
Christian Schlegel - Park City UT, US
Zachary Bagley - Salt Lake City UT, US

L-3 Communications Corporation - New York NY

H04B 7/216

370334, 370335, 370342, 375141, 4555621

A method is disclosed for operating a synchronous space division multiple access, code division multiple access communications system. The method includes steps of, within a coverage area of a base station (BS), (a) assigning the same spreading code to a plurality of subscriber stations (SSs); and (b) beamforming using an antenna array at the BS so as to maximize the signal to interference plus noise ratio for a signal transmitted from a desired SS, The beamforming operates to steer a null towards another same-code SS to minimize interference from the same-code SS. Assuming that the antenna array has M-elements (M>1), then individual ones of P orthogonal spreading codes can be reused αM times within the coverage area, where 1/M

7099372, Aug 29, 2006

Oct 24, 2001

10/037422

Leon L. Nieczyporowicz - Allen TX, US
Richard B. Ertel - Midvale UT, US
Thomas R. Giallorenzi - Riverton UT, US
Eric K. Hall - Holliday UT, US

L-3 Communications Corporation - New York NY

H04B 1/707

375140

Disclosed is a method for operating a code division multiple access communications system, and a system that operates in accordance with the method. The method operates within a coverage area of a base station by assigning a set of spreading codes to individual ones of a plurality of subscriber stations and then, during transmissions within the cell, by periodically hopping amongst spreading code within the set of spreading codes such that at any given time no two subscriber stations operate with the same spreading code. The set of spreading codes may include the all one's spreading code. The step of periodically hopping preferably changes from a currently used spreading code to a next spreading code at a symbol rate or at a multiple of the symbol rate. The set of spreading codes may be a hopped sub-set of a larger set of spreading codes, and in this case the method further operates to assign a non-hopped sub-set of the larger set of spreading codes to individual ones of the plurality of subscriber stations for use on a system access channel and/or on a system control channel or, more generally, for use on a non-traffic channel. The system may be a fixed data rate system or a variable data rate system.

7103026, Sep 5, 2006

Oct 24, 2001

10/038176

Eric K. Hall - Holliday UT, US
Richard B. Ertel - Midvale UT, US
Thomas R. Giallorenzi - Riverton UT, US

L-3 Communications Corporation - New York NY

G01R 31/08

370335, 370208, 370342, 370320, 375130, 375134, 375136, 375145, 375149

A method is disclosed for obtaining a spreading code set for a code division multiple access (CDMA) communications system. The method includes (a) generating a P′×P′ spreading code set where P′=P/N, where P is the spreading gain in chips/symbol and where N is an integer multiple of 2; and (b) replicating chips in each spreading code by N to produce a P′×P spreading code set. The step of generating may include randomizing the spreading code set by performing at least one or row or column permutation. The P′×P spreading code set is subsequently loaded into system hardware for operating the system hardware with a bandwidth that is less than the bandwidth that would be required to operate with the P′×P′ Hadamard spreading code set. The CDMA system may be a synchronous, direct sequence code division multiple access communications system.