A diversity receiver

A receiver and branch technology, applied in the field of receivers, can solve problems such as the inability to provide channel background noise, poor decoding effect of Viterbi decoder, and complicated operation of diversity receivers, so as to omit division operation, solve complex problems, cost-saving effect

Inactive Publication Date: 2007-05-23
SILICON INTEGRATED SYSTEMS
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Problems solved by technology

If it is handled in this way, it will complicate the operation of the diversity receiver during demodulation, and it will also increase the production cost due to the increase of the divider
[0018] On the other hand, because the channel equalizer of each branch of the known diversity receiver sets its channel weight (Channel weight) equal to the channel weights of other branches, the known diversity receiver only provides Channel information (Channel information), and cannot provide the background noise part of each channel
As a result, Viterbi decoders may decode poorly

Method used

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Embodiment Construction

[0028] The following describes the diversity receiver of the present invention in detail with reference to the drawings, and assumes that n, k, N, M, P, and Q are positive integers, and 1PN, 1QM.

[0029] Fig. 2 is a diagram showing a diversity receiver of the present invention. The diversity receiver 20 is provided with N branches 21-2N for receiving M versions of the input signal I 1 (n,k)-I M (n, k), where I Q (n, k) is the Qth version input signal of the nth symbol and the kth subcarrier transmitted by the transmitter. The diversity receiver 20 includes N Fourier transform circuits 211-2N1, N channel state information estimators 212-2N2, N matched filters (Match filter) 213-2N3, N soft bit reverse mappers 214- 2N4, a diversity combining selection unit 2a, and a channel decoder 2b.

[0030] The Fourier transform circuit 211-2N1 is separately provided in each branch 21-2N. The Pth Fourier transform circuit 2P1 receives the Qth version of the input signal I Q (n, k), an...

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Abstract

The invention relates to a grouped receiver, which uses match filter to replace signal channel balancer, to reduce the demodulation complexity, and avoids divider to reduce cost. The invention also has one noise power evaluator to provide background noise of each signal channel of signal channel decoder, to provide different weigh values; therefore, the decoder can obtain the background noise part of each signal channel, to improve decode effect.

Description

technical field [0001] The present invention relates to a receiver, in particular to a diversity receiver applied to Orthogonal Frequency Division Multiplexing. Background technique [0002] A general Orthogonal frequency division multiplexing (OFDM) system is a multi-carrier system, and the system includes a transmitter (Transceiver) and a receiver (Receiver). Each sub-carrier (Sub-carrier) transmitted from the transmitter to the receiver is orthogonal to each other and independently modulated. Therefore, the OFDM system has a very high bandwidth (Bandwidth) utilization efficiency, can provide a higher data transmission rate than other systems, and effectively compensate for the attenuation effect of multiple paths, so it is very suitable for wireless communication , such as a wireless local area network (Wireless LAN, WLAN) or a fourth generation mobile communication (4 Generation-Mobile communication, 4G). However, in a time-variant channel, even after the receiver perf...

Claims

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Application Information

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IPC IPC(8): H04B7/08H04L27/26
Inventor 曾雅蒂侯文生
Owner SILICON INTEGRATED SYSTEMS
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