Pei Wei Liu

US Patent:

8228836, Jul 24, 2012

Filed:

Jun 5, 2009

Appl. No.:

12/479563

Inventors:

Elza Erkip - New York NY, US
Thanasis Korakis - Brooklyn NY, US
Pei Liu - Forest Hills NY, US
Shivendra S. Panwar - Freehold NJ, US
Anna Scaglione - Davis CA, US

Assignee:

Polytechnic Institute of New York University - Brooklyn NY

International Classification:

H04B 7/14

US Classification:

370315

Abstract:

Data is transmitted from a source wireless device to a destination wireless device by: (a) discovering node-to-node wireless channel conditions in a wireless network; (b) determining at least one of (A) wireless relay devices, (B) modulation schemes, and (C) transmission rates using the discovered node-to-node channel conditions; (c) signaling at least some of the determined information to the determined wireless relay devices; (d) receiving, with each of the wireless relay devices, a transmission of the data from the source wireless device; and (e) transmitting, with each of the wireless relay devices, a randomized, space-time encoded, part of the received data, to the destination device using the signaled at least some of the determined information.

US Patent:

8509288, Aug 13, 2013

Filed:

Jun 4, 2009

Appl. No.:

12/478687

Inventors:

Elza Erkip - New York NY, US
Thanasis Korakis - Brooklyn NY, US
Pei Liu - Forest Hills NY, US
Shivendra S. Panwar - Freehold NJ, US

Assignee:

Polytechnic Institute of New York University - Brooklyn NY

International Classification:

H04B 3/36

US Classification:

375211, 178 70 R, 370226, 370315, 375267

Abstract:

Multiple cooperative relays operate in a highly mobile environment and form a virtual antenna array. Multiple independent streams of data can be simultaneously, transmitted in parallel to the destination receiver. Thus a higher spatial multiplexing gain can be obtained. Each relay device that receives the information without errors splits it into multiple streams. For example, if the relay devices receive B symbols and the number of streams is K, each stream contains B/K symbols. Each relay device then generates a random linear combination of all the streams and transmits this output simultaneously with the other relay devices.

US Patent:

8611271, Dec 17, 2013

Filed:

Nov 2, 2010

Appl. No.:

12/938101

Inventors:

Elza Erkip - New York NY, US
Pei Liu - Forest Hills NY, US
Chun Nie - Nutley NJ, US
Shivendra S. Panwar - Freehold NJ, US

Assignee:

Polytechnic Institute of New York University - Brooklyn NY

International Classification:

H03C 7/00

US Classification:

370315, 370310

Abstract:

A distributed and opportunistic medium access control (MAC) layer protocol for randomized distributed space-time coding (R-DSTC), which may be deployed in an IEEE 802. 11 wireless local area network (WLAN), is described. Unlike other cooperative MAC designs, there is no need to predetermine, before packet transmission, which stations will serve as relays. Instead, the MAC layer protocol opportunistically recruits relay stations on the fly. Network capacity and delay performance is much better than legacy IEEE 802. 11g network, and even cooperative forwarding using one relay station. Avoiding the need to collect the station-to-station channel statistics considerably reduces overhead otherwise required for channel measurement and signaling.

US Patent:

20110216662, Sep 8, 2011

Filed:

Jan 21, 2011

Appl. No.:

13/010951

Inventors:

Chun Nie - Nutley NJ, US
Pei Liu - Forest Hills NY, US
Thanasis Korakis - Brooklyn NY, US
Elza Erkip - New York NY, US
Shivendra S. Panwar - Freehold NJ, US

International Classification:

H04W 24/00

US Classification:

370252

Abstract:

Cooperative communication is a technique that can be employed to meet the increased throughput needs of next generation WiMAX systems. In a cooperative scenario, multiple stations can jointly emulate the antenna elements of a multi-input multi-output system in a distributed fashion. A framework for a randomized distributed space-time coding (“R-DSTC”) technique in the emerging relay-assisted WiMAX network, and the development of a cooperative medium access control (“MAC”) layer protocol, called CoopMAX, for R-DSTC deployment in an IEEE 802.16 system, is described. The technique described couples the MAC layer with the physical (PHY) layer for performance optimization. The PHY layer yields significant diversity gain, while the MAC layer achieves a substantial end-to-end throughput gain.

US Patent:

20210136656, May 6, 2021

Filed:

Oct 30, 2020

Appl. No.:

17/085260

Inventors:

- New York NY, US
Rajeev Kumar - Brooklyn NY, US
Pei Liu - McLean VA, US
Shivendra S. Panwar - Freehold NJ, US

International Classification:

H04W 40/32
H04W 76/15
H04L 1/18
H04W 40/24
H04L 12/42
H04W 40/22
H04W 48/20
H04W 28/04
H04W 48/16
H04W 88/08

Abstract:

Fifth Generation (5G) Millimeter Wave (mmWave) cellular networks are expected to serve a large set of throughput intensive, ultra-reliable, and ultra-low latency applications. To meet these stringent requirements, while minimizing the network cost, the 3Generation Partnership Project has proposed a new transport architecture, where certain functional blocks can be placed closer to the network edge. In this architecture, however, blockages and shadowing in 5G mmWave cellular networks may lead to frequent handovers (HOs) causing significant performance degradation. To meet the ultra-reliable and low-latency requirements of applications and services in an environment with frequent HOs, a Fast Inter-Base Station Ring (FIBR) architecture is described, in which base stations that are in close proximity are grouped together, interconnected by a bidirectional counter-rotating buffer insertion ring network. FIBR enables high-speed control signaling and fast-switching among BSs during HOs, while allowing the user equipment to maintain a high degree of connectivity. The FIBR architecture efficiently handles frequent HO events in mm Wave and/or Terahertz cellular systems, and more effectively satisfies the QoS requirements of 5G applications.