Apple Inc.

Alcatel Lucent

Nortel Networks Corporation

Research in Motion Corporation

Rockstar Bidco, LP

Blackberry Corporation

Moussa Abdi

Jianglei Ma

Wen Tong

Peiying Zhu

Ming Jia

Hua Xu

Hassan El Nahas El Homsi

Alexandre Jard

Sarah Boumendil

Jianming Wu

Evelyne Le Strat

Evelyne Lestrat

Jean-Marc Corbel

The present invention employs a pilot scheme for frequency division multiple access (FDM) communication systems, such as single carrier FDM communication systems. A given transmit time interval will include numerous traffic symbols and two or more short pilot symbols, which are spaced apart from one another by at least one traffic symbol and will have a Fourier transform length that is less than the Fourier transform length of any given traffic symbol. Multiple transmitters will generate pilot information and modulate the pilot information onto sub-carriers of the short pilot symbols in an orthogonal manner. Each transmitter may use different sub-carriers within the time and frequency domain, which is encompassed by the short pilot symbols within the transmit time interval. Alternatively, each transmitter may uniquely encode the pilot information using a unique code division multiplexed code and modulate the encoded pilot information onto common sub-carriers of the short pilot symbols.

Pilot scheme for a MIMO communication system

Spatial multiplexing and transmit diversity can improve the capacity of a wireless communication system. The system and method adapts communication schemes for communication systems with multiple antennas utilizing at least two transmission modes. The at least two transmission modes can, but are not necessarily, used for uplink communications. The two transmission modes may be chosen from the group consisting of a single antenna mode, a diversity mode a spatial multiplexed mode and a mixed diversity and spatial multiplexed mode. The at least two transmission modes may involve adaptation among multiple transmitters. At least one receiver may indicate a transmission mode to be used by a transmitter for a subsequent transmission. A transmitter may determine a transmission mode to be used for a subsequent transmission. The transmission mode can be based on channel sounding.

Adaptive transmission systems and methods

Rank adaptive transmission methods and apparatuses

The present invention employs a pilot scheme for frequency division multiple access (FDM) communication systems, such as single carrier FDM communication systems. A given transmit time interval (TTI) may include numerous traffic symbols and one or more pilot symbols. A mobile terminal may generate, for a transmitter, sounding pilot information and map the sounding pilot information onto at least certain sub-carriers within a TTI. The one or more pilot symbols may include at least a first group of subcarriers and at least a second group of subcarriers. The first group of subcarriers may be sounding pilots and the second group of subcarriers may be pilots for demodulation. The second group may not include sounding pilots.

A method and system for wireless frequency division multiple access communications in the uplink and/or downlink directions. A first time duration for transmission of a data payload block is established, and the transmission is processed using a first frequency domain or a time domain. A second time duration for transmission of at least one pilot block is established, and the transmission is processed using a second frequency domain or the time domain, the second time duration is not greater than the first time duration.

System and method for frequency division multiple access communications

A method and system for wireless frequency division multiple access communications in the uplink and/or downlink directions, having an improved pilot insertion scheme for single carrier based communications is provided. A first time duration for transmission of a data payload block () is established, and the transmission is processed using a first frequency domain or a time domain. A second time duration for transmission of at least one pilot block () is established, and the transmission is processed using a second frequency domain or the time domain, the second time duration () is not greater than the first time duration ().

A spread spectrum modulator converts input sequences composed of digital symbols into n&#x2267;2 spread-spectrum sequences. The spread spectrum modulator can generate spreading code and can combine the spreading code with the input sequences to produce the n spread spectrum sequences for transmission from n respective antennas of a radio transmitter. Each spread spectrum sequence corresponds to a sum of at least two contributions mutually shifted by a time substantially less than the duration of a symbol, each contribution being the product of a version of one of the n input sequences times the spreading code.

Spread spectrum modulator and demodulator

Growing community of inventors

Paris, France

Moussa Abdi