A method and system for decoding low density parity check (“LDPC”) codes. An LDPC decoder includes an R select unit, a Q message first-in first-out (“FIFO”) memory, and a cyclic shifter. The R select unit provides an R message by selecting from a plurality of possible R message values. The Q message memory stores a Q message until an R message is generated by a CNU, the Q message and the R message are combined to provide a P message. The cyclic shifter shifts the P message.

Low density parity check decoder for regular LDPC codes

The embodiments described herein methods and devices that enhance the endurance of a non-volatile memory (e.g., flash memory). The method includes obtaining, for each of the plurality of die, an endurance metric. The method also includes sorting the plurality of die into a plurality of die groups based on their corresponding endurance metrics, where each die group includes one or more die and each die group is associated with a range of endurance metrics. In response to a write command specifying a set of write data, the method further includes writing the write data to the non-volatile memory by writing in parallel subsets of the write data to the one or more die assigned to a single die group of the plurality of die groups.

Device and method for managing die groups

A system and method to perform Full Duplex (FD) Space Division Duplex (SDD) communication using a Self-Interference Cancelling (SIC) precoder that applies different antenna phase shifts and amplitude scales to the transmitted signals to force them to be in the null space of the selected receive antennas. Thus, a wireless communication unit can place nulls at each of its receive antennas digitally at baseband for one or more frequency bands. The SIC precoder may be computed based on the self-interference channel from the transmit chain(s) to the receive chain(s). Different SIC precoders may be adaptively selected and stored digitally for different frequency bands. Subsequent single or multi-user precoder can be applied in concatenation with the SIC precoder to transmit signals to one or more users while receiving signals from one or more users simultaneously over the same frequency band.

Dynamic space division duplex (SDD) wireless communications with multiple antennas using self-interference cancellation

Low Density Parity Check (LDPC) codes over GF(2) are an extension of binary LDPC codes with significantly higher performance. However, the computational complexity of the encoders/decoders for these codes is also higher. Hence there is a substantial lack of hardware implementations for LDPC over GF(2) codes. This paper proposes a novel variation of the belief propagation algorithm for GF(2) LDPC codes. The new algorithm results in a reduced hardware complexity when implemented in VLSI. The serial architecture of the novel decoding algorithm and two other algorithms for LDPC over GF(2) are implemented on an FPGA. The results show that the proposed algorithm has substantial advantages over existing methods. We show that the implementation of LDPC over GF(2) decoder is feasible for short to medium length codes. The additional complexity of the decoder is balanced by the superior performance of GF(2) LDPC codes.

Hardware Implementation of GF(2 m ) LDPC Decoders.

Disclosed are the design and implementation of a CSI feedback channel in a multi-carrier wireless communication system An apparatus and a method for channel state feedback using arithmetic coding are provided to ensure efficiency and reliability of a system by transmitting the CSI while compressing the CSI with a predetermined compression rate selected depending on a channel state The apparatus for CSI feedback in a wireless communication system performing channel estimation at a transmitter or a receiver by using a communication channel includes a transmitter terminal transmitting a signal for CSI measurement by using the communication channel, and a receiver terminal receiving the signal from the transmitter terminal, checking a channel state based on the received signal, and transmitting the signal to the transmitter terminal after compressing the signal according to the channel state

Method and apparatus for channel state feedback using arithmetic coding

An apparatus and a method for receiving a signal in a communication system using a Low Density Parity Check (LDPC) code. The apparatus and the method includes decoding a received signal according to a hybrid decoding scheme, wherein the hybrid decoding scheme is generated by combining two of a first decoding scheme, a second decoding scheme, and a third decoding scheme.

Apparatus and method for receiving signal in a communication system using a low density parity check code

The present invention relates to a method of displaying of content on a display, the method comprising: determining at least one active user equipment of a wireless telecommunication network being located in the proximity of the display, selecting content depending on a user profile being assigned to a user of the at least one active user equipment, displaying the content on the display.)

A method for displaying of content

Link adaptation technology has been introduced in new generation transmission systems, such as 3G and 4G, optimizing both their throughput and their power consumption. Adaptation of the radio configuration requires information about the radio link quality. The information must be exchanged between the access point and the mobile terminal, leading to an associated signaling load, whose amount may decrease the system transmission efficiency. A mechanism for reducing the amount of signaling information has to be designed to increase the overall system capacity (more users, more available bandwidth). The paper addresses multi-carrier systems whose link adaptation is carried out by means of bit loading algorithms. However, the associated signaling load increases quickly with the number of sub-carriers, modulation schemes and users. These bit loading vectors are considered a-priori known at the receiver, and almost no literature concerning transmission of such information is available. In realistic transmission systems, correlation exists in time due to Doppler effects, and in frequency due to multipath delay spread. We intend to exploit this twofold redundancy to decrease signaling information load. An adaptive lossless compression system for an optimized compression performance and complexity is proposed, giving much higher compression ratio than the existing LZW bit loading algorithm (Lestable, T. and Battelli, M., 2002).

Compression of associated signaling for adaptive multi-carrier systems

An apparatus and method for transmitting/receiving a signal in a communication system are provided. The method includes inputting an information word during initial transmission and transmitting a first code word created by encoding the inputted information word based on a first coding ratio, and transmitting a portion of a second code word created by encoding the first code word based on a second coding ratio at a retransmission request. Accordingly, the apparatus and method provide for transmitting/receiving signals in a communication system in such a manner that the complexity of the communication system is reduced.

Apparatus and method for transmitting/receiving signal in communication system

In this paper, we analyse the throughput of a multihop network, where nodes use slotted ALOHA as medium access protocol (MAC) and are able to receive simultaneously several packets in a slot. We provide a closed-form formula for the throughput in the generic case as a function of the probability, r n,k , for a receiver to decode k packets given that n have been sent in its neighborhood. We then consider several simple models for the computation of the r n,k , when spread slotted ALOHA is used. In particular, we compare the performances of a matched filter (MF) receiver with those of a linear minimum mean-square error (MMSE) multi-user detector (MUD). Capacity results show the great advantage of multi-packet reception and highlight the near-far resistance of the MUD scheme.

/pdf/throughput-of-the-multi-hop-slotted-aloha-with-multi-packet-4827rgj640.pdf

Throughput of the Multi-hop Slotted Aloha with Multi-packet Reception

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