Source: http://www.google.com/patents/US8149810?dq=%235,519,867
Timestamp: 2015-04-26 06:41:22
Document Index: 103216066

Matched Legal Cases: ['Application No. 60', 'art 11', 'art 11', 'art 11', 'art 11', 'art 16', 'art 11', 'art 11', 'art 11', 'art 11']

Patent US8149810 - Data rate adaptation in multiple-in-multiple-out systems - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA transmit data rate adaptation method in a multiple-in-multiple-out (MIMO) system with a first transceiver and a second transceiver. The first transceiver transmits signals to the second transceiver. The second transceiver analyzes channel quality of the received signals and uses link adaptation to...http://www.google.com/patents/US8149810?utm_source=gb-gplus-sharePatent US8149810 - Data rate adaptation in multiple-in-multiple-out systemsAdvanced Patent SearchPublication numberUS8149810 B1Publication typeGrantApplication numberUS 10/620,024Publication dateApr 3, 2012Filing dateJul 14, 2003Priority dateFeb 14, 2003Also published asUS8532081, US8861499Publication number10620024, 620024, US 8149810 B1, US 8149810B1, US-B1-8149810, US8149810 B1, US8149810B1InventorsRavi Narasimhan, Hemanth SampathOriginal AssigneeMarvell International Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (41), Non-Patent Citations (22), Referenced by (15), Classifications (10), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetData rate adaptation in multiple-in-multiple-out systems
The present application claims priority to co-assigned U.S. Provisional Application No. 60/447,448, entitled �Data Rate Adaptation in Multiple In Multiple Out (MIMO) Systems� and filed on Feb. 14, 2003.
The present application relates to a hybrid multiple-in-multiple-out (MIMO) system that may use aspects of link adaptation and cycling through a shortlist of transmit modes. A receiver may receive signals from a transmitter and derive channel quality statistics, such as a mean signal-to-interference-and-noise ratio (SINR). The receiver may compare the derived post-processing mean SINR with pre-determined threshold mean SINRs in a lookup table for an ideal �orthogonal� channel. The receiver may use the lookup table to efficiently find an optimum transmission mode or a shortlist of possible modes. The single lookup table may be relatively small and more efficient to implement than one or more lookup tables that account for multiple channel scenarios. The receiver feeds back the optimum transmission mode or shortlist to the transmitter, which adapts its spatial multiplexing rate s, coding rate r and modulation order m. The receiver may feed the optimum transmission scheme(s) back to the transmitter in a compressed manner, such as lookup table indices. The system may minimize retransmissions and hence improve medium access controller (MAC) throughput.
FIG. 1 illustrates a wireless multiple-in-multiple-out (MIMO) communication system 130, which includes a first transceiver 100 with multiple antennas 104 and a second transceiver 102 with multiple antennas 106. In an embodiment, each transceiver has four antennas, forming a 4�4 MIMO system. For the description below, the first transceiver 100 is designated as a �transmitter� because the transceiver 100 predominantly transmits signals to the transceiver 102, which predominantly receives signals and is designated as a �receiver�. Despite the designations, both �transmitter� 100 and �receiver� 102 may transmit and receive data, as shown by the transmit portions 101A, 101B and receive portions 103A, 103B in each transceiver.
( s ∈ [ 1 2 , 3 4 , 1 , 2 , 3 , 4 ] ) may have up to 8�6=48 different data �transmission modes� or �transmission schemes,� each with its own data rate.
( f s = 10 d s � log 10 ( x / 100 ) ) relating outage probability and diversity order ds at high SINRs. The value �x� is a reliability factor (the second column in FIG. 8) obtained according to an expression
s * , r * , m * = arg max s , r , m [ sgn ( G s , r - μ s , r , m _ ) � s � log 2 m � r ] , where �max� means maximum value, �sgn� means signum, and R=r�log2(m)�s is the physical layer (raw) data rate (Rs,r,m) in Bps/Hz. If sgn(Gs,r− μs,r,m )=+1, i.e., Gs,r> μs,r,m , then s, r, m represent an acceptable mode for a shortlist. If sgn(Gs,r− μs,r,m )=−1, i.e., Gs,r< μs,r,m , then s, r, m represent an unacceptable mode for a shortlist.
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KgMethod and device for testing a mobile-radio device by means of static channel simulationUS20110300857 *Oct 16, 2009Dec 8, 2011Telefonaktiebolaget Lm Ericsson (Publ)Multicarrier Transmission Method and ApparatusUS20120182959 *Jun 18, 2010Jul 19, 2012Lg Electronics Inc.Method and apparatus for transceiving data in a wireless communication systemUS20120307924 *May 16, 2012Dec 6, 2012Indian Institute Of ScienceMultiple input multiple output (mimo) transmitted signal vector estimation employing monte carlo sampling techniquesUS20140133591 *Jan 21, 2014May 15, 2014Indian Institute Of ScienceMultiple input multiple output (mimo) transmitted signal vector estimation employing monte carlo sampling techniques* Cited by examinerClassifications U.S. Classification370/343, 370/329, 455/101, 455/67.13, 455/452.2, 455/115.1International ClassificationH04J1/00Cooperative ClassificationH04B7/0689, H04L1/0001European ClassificationH04B7/06H1Legal EventsDateCodeEventDescriptionJul 14, 2003ASAssignmentFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MARVELL SEMICONDUCTOR, INC.;REEL/FRAME:014299/0390Owner name: MARVELL INTERNATIONAL LTD., BERMUDAEffective date: 20030714Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NARASIMHAN, RAVI;SAMPATH, HEMANTH;SIGNING DATES FROM 20030711 TO 20030714;REEL/FRAME:014299/0374Owner name: MARVELL SEMICONDUCTOR, INC., CALIFORNIARotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services