Motorola Corporation

Motorola Mobility LLC

Google Inc.

Michael N Kloos

Mark J Marsan

Derek Alan Oxley

Michael W Bychowsky

Michael S Palac

Frederick W Vook

Alan P Rottinghaus

Xiaoyong Yu

Patrick Joseph Doran

Stephen Shiao

Michael J Rudowicz

Christopher L Johnson

Mark Spiotta

Paul A Kuban

Dien N Nguyen

David A Hensley

Mahesh Krishnaswamy

Xiaonyong Yu

Yashpal Thind

An Orthogonal Frequency Division Multiplexing communication system is provided that schedules a transmission of uplink sounding signals or channel quality feedback signals in sounding intervals, or sounding zones, that are outside of the sub-frames, thereby preserving sub-frame capacity for other overhead and data transmissions.

Method and apparatus for channel sounding in an orthogonal frequency division multiplexing communication system

A method for configuring color codes in a cellular telephone network is disclosed. The method includes calculating a distance between all possible color codes to be assigned to each of the cells in the network, assigning a first code to a first base station, determining a second code corresponding to a maximum calculated distance from the first code, and assigning subsequent codes to adjacent cells as determined by the maximum available distance between the two neighboring cells' codes to help minimize cross talk and channel interference on the cellular network.

Color code reuse for cellular systems

Disclosed is a method and communication device for suppressing interference. The method comprises performing, with a turbo decoder (), at least one turbo decoding attempt () on a received signal (). The turbo decoding attempt generates at least one whole word code bit therefrom (). The whole word code bit () corresponds to a group of bits comprising a transmitted symbol. The method determines if the whole word code bit () has a confidence level exceeding a given threshold (). If the whole word code bit () does have a confidence level exceeding the given threshold, the whole code word bit is selected for use in data symbol recovery ().

Turbo interference suppression in communication systems

A communication device encrypts symbols at a physical layer in order to improve encryption of data transmitted over a wireless link. A symbol mapper of the communication device receives a bit stream comprising multiple bits and maps the multiple bits to multiple symbols. An amplitude and phase adjuster of the communication device receives the multiple symbols and encrypts the symbols by applying at least one of a phase shift and an amplitude adjustment to each symbol of the multiple symbols to produce multiple encrypted symbols for transmission over a wireless link. In another embodiment of the present invention, a communication device is provided that is able to decrypt the encrypted symbols by applying at least one of a phase shift and an amplitude adjustment to each encrypted symbol that corresponds to a phase shift or an amplitude adjustment applied to the symbol by a transmitting communication device.

Method and apparatus for encryption of over-the-air communications in a wireless communication system

Arrangements relating to an Orthogonal Frequency Division Multiplexing (OFDM) receiver () can include performing at least one Low-Density Parity Check (LDPC) decoding attempt on a received signal () and evaluating at least one parity check for each LDPC decoding attempt (). Failed LDPC decoding attempts can be counted according to the evaluated parity checks (). The signal can be selectively processed through at least one joint demodulation-decoding loop according to the counting of failed LDPC decoding attempts ().

Orthogonal frequency division multiplexing (OFDM) system receiver using low-density parity-check (LDPC) codes

An Integrated Digital Enhanced Network system () includes a base radio () interconnected to a plurality of transcoders () located at central offices (). The base radio () time division multiplexes voice packets from the plurality of transcoders () into a time division multiplexed signal frame (). Each signal frame () includes a plurality of sequential frames (). Each sequential frame () includes a predetermined number of slots () based upon a channel interleave. Each of the slots () includes a slot descriptor block (), and a plurality of subslots (e.g.,). The slot descriptor block () alternatively contains overhead information for the plurality of subslots (e.g.,). The subscriber device () demultiplexes each sequential frame () and receives a specific slot () and a specific subslot of the specific slot based upon an assigned slot offset. The subscriber device () executes a handover process () for determining a timing for jumping to a time division signal frame () generated by a new base radio.

Method and apparatus sharing a slot descriptor block between multiple users

A system, wireless device () and method reduce the peak-to-average power of a transmitter by creating at least two sampled carrier data streams, running each carrier through a separate delay block, mixing each carrier over in frequency an appropriate amount, resulting in at least two frequency division multiplexed signals, and combining the at least two frequency division multiplexed signals together. The four sampled carrier data streams may each have a bandwidth of 25 kHz. Each separate delay block is less than 20% of its corresponding symbol time. The transmitter may be used to transmit wideband integrated digitally enhanced network (WiDEN) signals.

Subcarrier time offsets for improved peak-to-average power of a transmitter

A system for reducing or eliminating cross talk resulting from co-channel interference in TDMA communication systems is disclosed. In general, the system may include one or more enhanced mobile stations sending, to an enhanced base station, base station identifying information in a training period that was previously used by mobile units to send pseudotrainiug information. The base station identifying information may include, but is not limited to, global cell site identification or any portion thereof or local cell site identification or any portion thereof. Upon receipt of information including the appropriate base station identifying information, die enhanced base station may perform enhanced synchronization and reception and correction functions.

Timing recovery and cross talk prevention in the presence of co-channel interference

A full duplex wireless communication system () one or more wireless communication devices () and fixed infrastructure equipment that includes at least a transcoder (), a router () and a base transceiver site (BTS,). To reduce delays of information packets communicated between the transcoder and the BTS, the transcoder, router and BTS employ a unique synchronization-based priority scheme. In accordance with the priority scheme, an indication of the status of synchronization between the transcoder and the BTS is included in an information pace to guide the router's processing of the packet. In the event that the router stores the packet the router preferably inserts a time-delay indication into a portion of the packet. The BTS uses the time-delay indication to determine a desired transcoder transmission time, and communicates an indication of the desired transcoder transmission time to the transcoder.

Method and apparatus for improving perceived signal quality of transmitted information in a full duplex wireless communication system

A time division multiple access communication system is provided having multiple sub-channels according to known quadrature amplitude modulation techniques. Each sub-channel has a pre-determined time duration and is divided by a pre-determined number of symbol position time divisions. The symbol positions carry color codes and ACP codes in addition to sync, pilot and data symbols. Pilot symbols in the second half of the slot are replaced with dual purpose color code and ACP symbols. The dual purpose symbols are either modulated with a lower order modulation than data symbols or are repeated values of dedicated symbols located earlier in the same slot, or both. Slot throughput is attained with a minimal bit error rate penalty.

Digital communication system having improved pilot encoding

A time division multiple access communication system is provided having multiple sub-channels according to known quadrature amplitude modulation techniques. Each sub-channel has a pre-determined time duration and is divided by a pre-determined number of symbol position time divisions. The symbol positions carry sync, pilot and data symbols. Color code information is incorporated into the sync and pilot symbols. The QAM constellation value of the sync symbol is mapped to a color code value. In addition, the sync symbol carries a color code extension which enlarges the color code space.

Digital communication system having improved color code capability

A packet prioritization and transmission algorithm for on demand transportation of data packets having different priorities through a shared packet pipe. The algorithm comprises prematurely ending the transmission of a packet having a low priority; placing the remainder of the packet having the low priority in a storage means, holding data of the packet having the low priority in the storage means, transmitting a packet having a high priority, transmitting the remainder of the packet having the low priority once the packet having the high priority is finished transmitting, flagging a packet header of a packet having the low priority to identify pending packets to allow for transmission of packets having the high priority; and determining a priority of an incoming packet.

Method and apparatus for tunneling packets in a packet data system

An audio automatic gain control (AGC) circuit (301) employs a method (400, 500) and apparatus (300) for mitigating noise in an output signal (307) of the audio AGC circuit (301). The audio AGC circuit (301) or a circuit coupled to the audio AGC circuit, such as a speech encoder (302), determines (405) whether audio information is present in an input signal (137) to the audio AGC circuit (301). When audio information is not present, the audio AGC circuit (301) applies (411) a gain to the input signal (137) that is less than a current gain being applied, thereby mitigating noise in the audio AGC circuits output signal (220) when audio is not present.

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Belvidere, IL, United States of America

Michael N Kloos