Gary Lomp

United States Patent and Trademark Office (USPTO)
Patents issued to Gary R. Lomp as of 2 February, 2017

1.  Patent number: 9,264,082  System and algorithm for multipath mitigation 
2.  Patent number: 8,976,837  Low probability of detection (LPD) waveform 
3.  Patent number: 8,824,523  Setting a transmission power level for a mobile unit 
4.  Patent number: 8,737,363  Code division multiple access (CDMA) communication system 
5.  Patent number: 8,659,989  Method and apparatus for waveform independent ranging 
6.  Patent number: 8,553,816  Setting a transmission power level for a mobile unit 
7.  Patent number: 8,477,890 Geometric detector for communicating through constant modulus (CM) interferers 
8.  Patent number: 8,340,228  Setting a transmission power level for a mobile unit 
9.  Patent number: 8,009,636  Method and apparatus for performing an access procedure 
10.  Patent number: 7,961,822  Setting a transmission power level for a mobile unit 
11.  Patent number: 7,929,498 Adaptive forward power control and adaptive reverse power control for spread-spectrum communications 
12.  Patent number: 7,903,613  Code division multiple access (CDMA) communication system 
13.  Patent number: 7,873,328  Subscriber unit for performing an access procedure 
14.  Patent number: 7,756,190  Transferring voice and non-voice data 
15.  Patent number: 7,706,830  Method and subscriber unit for performing an access procedure 
16.  Patent number: 7,706,332  Method and subscriber unit for performing power control 
17.  Patent number: 7,697,643  Setting a transmission power level for a mobile unit 
18.  Patent number: 7,593,453 Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) system 
19.  Patent number: 7,535,874 Method and apparatus for adaptive power control for spread-spectrum communications 
20.  Patent number: 7,502,406 Automatic power control system for a code division multiple access (CDMA) communications system 
21.  Patent number: 7,437,177 Method employed by a base station for controlling initial power ramp-up using short codes 
22.  Patent number: 7,406,120  Transmission channel impulse response estimation using fast algorithms 
23.  Patent number: 7,286,847  Method and apparatus for performing an access procedure 
24.  Patent number: 7,190,966  Method and apparatus for performing an access procedure 
25.  Patent number: 7,145,893  Communication station having an improved antenna system 
26.  Patent number: 7,123,600  Initial power control for spread-spectrum communications 
27.  Patent number: 7,117,004  Method and subscriber unit for performing an access procedure 
28.  Patent number: 7,085,583  Communication unit for access 
29.  Patent number: 7,072,380 Apparatus for initial power control for spread-spectrum communications 
30.  Patent number: 7,050,418  Modem for processing CDMA signals 
31.  Patent number: 7,020,111 System for using rapid acquisition spreading codes for spread-spectrum communications 
32.  Patent number: 6,985,467 Rapid acquisition spreading codes for spread-spectrum communications 
33.  Patent number: 6,983,009  Median weighted tracking for spread-spectrum communications 
34.  Patent number: 6,940,840 Apparatus for adaptive reverse power control for spread-spectrum communications 
35.  Patent number: 6,904,294 Subscriber unit for controlling initial power ramp-up using short codes 
36.  Patent number: 6,885,652  Code division multiple access (CDMA) communication system 
37.  Patent number: 6,879,841 Method employed by a subscriber unit for controlling initial power ramp-up using short codes 
38.  Patent number: 6,873,645 Automatic power control system for a code division multiple access (CDMA) communications system 
39.  Patent number: 6,839,567 Method employed by a base station for controlling initial power ramp-up using short codes 
40.  Patent number: 6,831,905 Spread spectrum system assigning information signals to message-code signals 
41.  Patent number: 6,816,473 Method for adaptive forward power control for spread-spectrum communications 
42.  Patent number: 6,801,516 Spread-spectrum system for assigning information signals having different data rates 
43.  Patent number: 6,788,662 Method for adaptive reverse power control for spread-spectrum communications 
44.  Patent number: 6,778,840 Method of controlling initial power ramp-up in a CDMA system by using short codes 
45.  Patent number: 6,744,809 Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) system 
46.  Patent number: 6,721,350  Spread spectrum adaptive power control using a base station 
47.  Patent number: 6,721,301  Centroid tracking for spread-spectrum communications 
48.  Patent number: 6,707,805 Method for initial power control for spread-spectrum communications 
49.  Patent number: 6,697,350 Adaptive vector correlator for spread-spectrum communications 
50.  Patent number: 6,674,791 Automatic power control system for a code division multiple access (CDMA) communications system
51.  Patent number: 6,674,788 Automatic power control system for a code division multiple access (CDMA) communications system 
52.  Patent number: 6,671,308  Spread spectrum adaptive power control 
53.  Patent number: 6,633,600  Traffic lights in a code division multiple access (CDMA) modem 
54.  Patent number: 6,611,548  Multipath processor 
55.  Patent number: 6,606,503 Apparatus for controlling initial power ramp-up in a CDMA system by using short codes 
56.  Patent number: 6,584,091  CDMA base station having an improved antenna system 
57.  Patent number: 6,577,876 Base station for controlling initial power ramp-up using short codes 
58.  Patent number: 6,571,105 Method employed by a base station for controlling initial power ramp-up using short codes 
59.  Patent number: 6,519,474 Subscriber unit for controlling initial power ramp-up using short codes 
60.  Patent number: 6,507,745 Apparatus for controlling initial power ramp-up in a CDMA system by using short codes 
61.  Patent number: 6,493,563 Method of controlling initial power ramp-up in CDMA systems by using short codes 
62.  Patent number: 6,490,462 Method of controlling initial power ramp-up in a CDMA system by using short codes 
63.  Patent number: 6,466,567  CDMA base station having an improved antenna system 
64.  Patent number: 6,456,608 Adaptive vector correlator using weighting signals for spread-spectrum communications 
65.  Patent number: 6,452,918  CDMA subscriber unit having an improved antenna system 
66.  Patent number: 6,418,135  Communication station with multiple antennas 
67.  Patent number: 6,381,264 Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) sys-tem 
68.  Patent number: 6,330,272 Receiving a spread spectrum data signal using determined weights 
69.  Patent number: 6,272,168  Code sequence generator in a CDMA modem 
70.  Patent number: 6,259,687  Communication station with multiple antennas 
71.  Patent number: 6,229,843  Pilot adaptive vector correlator 
72.  Patent number: 6,226,316 Spread spectrum adaptive power control communications system and method 
73.  Patent number: 6,215,778 Bearer channel modification system for a code division multiple access (CDMA) communication system 
74.  Patent number: 6,212,174 Capacity management method for a code division multiple access (CDM) communication system 
75.  Patent number: 6,181,949 Method of controlling initial power ramp-up in CDMA systems by using short codes 
76.  Patent number: 6,175,586 Adjusting a transmitter power level for a spread spectrum transmitter 
77.  Patent number: 6,157,619  Code division multiple access (CDMA) communication system 
78.  Patent number: 6,049,535  Code division multiple access (CDMA) communication system 
79.  Patent number: 5,995,538  Spread spectrum multipath processor system and method 
80.  Patent number: 5,991,332 Adaptive matched filter and vector correlator for a code division multiple access (CDMA) modem 
81.  Patent number: 5,991,329 Automatic power control system for a code division multiple access (CDMA) communications system 
82.  Patent number: 5,920,590  Variable bandwidth spread spectrum device 
83.  Patent number: 5,912,919 Efficient multipath centroid tracking circuit for a code division multiple access (CDMA) system 
84.  Patent number: 5,862,155  Trellis coded FM digital communications system and method 
85.  Patent number: 5,841,768 Method of controlling initial power ramp-up in CDMA systems by using short codes 
86.  Patent number: 5,835,527  Spread spectrum adaptive power control system and method 
87.  Patent number: 5,799,010  Code division multiple access (CDMA) communication system 
88.  Patent number: 5,796,776  Code sequence generator in a CDMA modem 
89.  Patent number: 5,740,206  Adaptive nonlinear equalizer for digital FM signals 
90.  Patent number: 5,673,286  Spread spectrum multipath processor system and method 
91.  Patent number: 5,661,734  Trellis coded FM digital communications system and method 
92.  Patent number: 5,574,747  Spread spectrum adaptive power control system and method 
93.  Patent number: 5,563,907  Variable bandwidth spread spectrum device and method 
94.  Patent number: 5,535,238 Spread spectrum adaptive power control communications system and method 
95.  Patent number: 5,461,632  Trellis coded FM digital communications system and method 
96.  Patent number: 5,351,249  Trellis coded FM digital communications system and method 
97.  Patent number: 5,345,467  CDMA cellular hand-off apparatus and method 

One of the areas of research I have worked in is Equalization of Digital Communucation Channels perturbed by multipath. An interesting problem in this area is the equalization problem for offset modulations, such as O-QPSK, which is popular because of its behavior under nonlinear amplifier effects. It has been recognized that, due to the interleaving of the I and Q samples, equalization should be determined so as to minimize only the portion of the intersymbol interference (ISI) of interest (relevant to decision) at the sample time. This means that the imaginary component may be ignored during I-samples and the real component may be ignored during Q-samples. The paper derives in a unique way the optimal equalization filters in both the linear and nonlinear (decision feedback or DFE) cases. The solution provides for the first time a closed form definition of the optimal equalizer filters as well as the minimum mean squared error that is obtained. One reason this problem has eluded general treatment is that one encounters a Wiener-Hopf factorization of a 2 by 2 matrix spectral function. While this is a solved problem, the factors obtained do not relate easily to the underlying scalar channel transfer function. This difficulty is circumvented by a employing clever isomorphism in which the complex-valued signals and system functions are embedded in a 4-dimensional (odd-even, real-imaginary) real vector space. The equalizer in the offset case is shown to be distinct in architecture and performance from the conventional non-offset case. A comprehensive and tutorial unified analysis is presented that allows these cases to be compared directly as a function the multipath channel.

This work has also been extended to the MIMO case and some results in that area are also available. In particular, I have shown that MIMO processing of wideband (large instantaneous bandwidth) communication signals is as efficient as, if not more efficient than, MIMO processing of multicarrier narrowband signal formats such as OFDM. This is important for applications in which the undesirable large peak-to-average power ratio (PAPR) of OFDM is a concern.

Also in connection with the problem of signal transmission, I have developed a generalization of OFDM that is appropriate for channels that exhibit dispersion in both the frequency as well as time domain. Doppler induced by platform motion is an example.

Another problem I have worked on is called Tessellation of the Sphere. This the problem of placing points on the surface of an N-dimensional (real) sphere in a manner that maximizes the minimum Euclidian distance between any two points. It is a problem with a long history. It can be extended to 2N-dimensional space, and in particular, one can consider the problem of tessellation in unitary (N-dimensional complex) space. In this case, the points may be taken as signal vectors in an I-Q (complex baseband) communication system. My interest is in determining such complex constellations that have special properties that render their use in power and bandwidth limited digital communications more efficient. 

The above research leads to several interesting mathematical problems. Two of these are:

1. Finding maximal abelian subgroups of a (transitive) permutation group

2. Simultaneous singular value decomposition of a family of matrices and approximations thereof