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Transmitter for a wireless communications system using multiple codes and multiple antennas

A wireless communication system and transmitter technology, applied in the field of transmitters, can solve problems such as unsatisfactory transmission antennas

Inactive Publication Date: 2004-06-23
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In contrast, it is desirable to provide each receiver with only a relatively small number of receive antennas, for example only two receive antennas, but this would undesirably limit the number of transmit antennas to such a small number, which would correspondingly limit the above Advantages of the transmitter

Method used

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  • Transmitter for a wireless communications system using multiple codes and multiple antennas
  • Transmitter for a wireless communications system using multiple codes and multiple antennas
  • Transmitter for a wireless communications system using multiple codes and multiple antennas

Examples

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Embodiment Construction

[0022] Referring to the drawings, FIG. 1 shows a conventional multiple code transmitter in a wireless communication system in which a single transmit antenna 10 coupled to a single linear power amplifier (LPA) 12 is employed.

[0023] In the transmitter of Fig. 1, for example, data from a packet data source 14 is encoded by a Turbo encoder (parallel concatenated convolutional encoders) 16, and the encoded data are respectively subjected to known rate matching and channel interleaving functions Components 18 and 20 are processed and then provided to a modulator 22 which modulates the encoded data according to any one of a variety of modulation methods (e.g. QPSK, 8PSK, 16QAM and 64QAM), and is therefore called a variable modulator.

[0024] The modulated data symbols produced by modulator 22 are provided with a desired channel gain G in gain unit 24, and these modulated data symbols are provided to demultiplexer 26, which demultiplexes these The data symbols are allocated to a...

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Abstract

In a transmitter of a wireless communications system having M transmit antennas, each transmit antenna is supplied with a respective combined signal comprising a respective one of M groups each of N data sub-streams, orthogonally spread by N Walsh code sequences (W1 to WN). The N orthogonal code sequences used for each of the M groups comprise a respective one of M different combinations of N from Nw orthogonal code sequences, where Nw>N. M and N are integers greater than one. The combined signals can also include orthogonally spread pilot signals (WP) for channel estimation at a receiver. Orthogonally of the signals transmitted from the transmit antennas is increased, so that transmit signal power can be decreased and / or the receiver can have fewer than M receive antennas.

Description

technical field [0001] The present invention relates to a transmitter for a wireless communication system, and in particular, the present invention relates to a transmitter employing multiple codes and multiple antennas. Background technique [0002] In a wireless communication system, it is desirable to increase the data rate for data communication without adversely affecting other parameters of the system, such as bit error rate, complexity, transmitted signal power, and cost. [0003] Accordingly, it is known to provide a transmitter of a wireless communication system in which coded and modulated data to be transmitted is divided into a plurality of data sub-streams in order to employ, for example, Walsh function (or code sequence, also referred to as Walsh code) and other orthogonal codes for code expansion, and then the generated Walsh coded data sub-stream is combined by a complex PN (pseudo-random or pseudo-noise) sequence and scrambled to produce a signal that is am...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J99/00H04B1/707H04B7/04H04B7/06H04J11/00
CPCH04B7/0678H04B2201/70701Y02B60/50H04J13/0048H04B7/06
Inventor 童文M·G·巴考林V·B·克雷德林A·M·克洛马Y·S·施纳科夫
Owner APPLE INC