Lsi Corporation

Avago Technologies General IP (singapore) Pte. Ltd.

Eran Goldstein

Shai Kalfon

Ido Gazit

Assaf Prihed

Assaf Pihed

Eran Ovadia Mershain

In described embodiments, a physical downlink control channel of a device operating in accordance with a 3GPP LTE standard is processed to provide interleaving, modulation and multi-layer mapping and pre-coding. A Resource Element Group interleaver applies interleaving to an input signal representing an input bitstream, and a modulator modulates the input signal. After interleaving and modulating the signal, a multi-layer mapper and pre-coder layer-maps and pre-codes the interleaved and modulated input signal into a plurality of different layers.

Interleaving, modulation, and layer mapping in an LTE physical control channel

A transmitter comprises indicator channel processing circuitry configured to process indicator channel codewords for transmission in a base station of a wireless system. The indicator channel processing circuitry performs a plurality of processing operations on the indicator channel codewords in a specified processing sequence, with the plurality of processing operations comprising at least modulation, scrambling, spreading and combining. In the specified processing sequence, the scrambling operation is performed for at least a given one of the indicator channel codewords prior to the modulation and spreading operations for that codeword or subsequent to the combining operation for that codeword. For example, the specified processing sequence may comprise the scrambling, modulation, spreading and combining operations performed in that order for at least the given codeword, or the modulation, spreading, combining and scrambling operations performed in that order for at least the given codeword.

Downlink indicator channel processing in a wireless system base station

An apparatus including a first circuit and a second circuit. The first circuit may be configured to receive a first 2N-bit complex number and a second 2N-bit complex number, each having a first format, and to reformat the first and the second 2N-bit complex numbers to a second format such that a lower portion of each real and imaginary part of each 2N-bit complex number is positive. The second circuit may be configured to multiply the first and the second 2N-bit complex numbers using at least one N-bit signed complex multiplier, where N is an integer.

Method for implementing 32 bit complex multiplication by using 16-bit complex multipliers

A transmitter comprises resource mapping circuitry configured to map symbols from multiple control channels to transmission symbols in a base station of a wireless system. The resource mapping circuitry comprises a table-based mapper configured to receive the control channel symbols and to map those symbols to the transmission symbols utilizing at least a selected one of a plurality of tables providing respective distinct mappings between the control channel symbols and the transmission symbols. For example, each of the transmission symbols may comprise a plurality of resource groups and the tables may specify distinct mappings of the control channels symbols to resource groups for different sets of possible base station parameter values. In one embodiment, the control channels comprise a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), and a physical hybrid ARQ indicator channel (PHICH) of an LTE cellular system.

Table-based resource mapping for downlink control channels in a wireless system base station

Described embodiments provide a wireless communication system that employs modulation and precoding. An input bit stream is divided into one or more batches. Each batch has a consecutive number of bits. A modulation scheme is determined for batches. A precoding scheme for layer mapping is determined for the batches. Based on the modulation scheme and precoding scheme, a look-up table (LUT) is selected. The selected LUT maps the batches into one or more modulated and precoded layers. The modulated and precoded batches are provided to a transmission module.

Modulation and layer mapping in physical channels

An apparatus including a processor, a computer readable storage medium, and a lookup memory. The computer readable storage medium generally contains computer executable instruction that when executed by the processor perform operations involving fixed point multiplication. The lookup memory generally stores values used in the fixed point multiplication. The values stored in the lookup memory are approximated based upon a predetermined value to prevent overflow in the fixed point multiplication.

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Raanana, Israel

Eran Goldstein